This section lists the release notes for each stable version of NixOS and current unstable revision.

B.1. Release 21.03 (“Okapi”, 2021.03/??)

B.1.1. Highlights

In addition to numerous new and upgraded packages, this release has the following highlights:

  • Support is planned until the end of October 2021, handing over to 21.09.

B.1.2. New Services

The following new services were added since the last release:

B.1.3. Backward Incompatibilities

When upgrading from a previous release, please be aware of the following incompatible changes:

  • systemd-journal2gelf no longer parses json and expects the receiving system to handle it. How to achieve this with Graylog is described in this GitHub issue.

  • If the services.dbus module is enabled, then the user D-Bus session is now always socket activated. The associated options services.dbus.socketActivated and services.xserver.startDbusSession have therefore been removed and you will receive a warning if they are present in your configuration. This change makes the user D-Bus session available also for non-graphical logins.

  • The option fonts.enableFontDir has been renamed to fonts.fontDir.enable. The path of font directory has also been changed to /run/current-system/sw/share/X11/fonts, for consistency with other X11 resources.

  • A number of options have been renamed in the kicad interface. oceSupport has been renamed to withOCE, withOCCT has been renamed to withOCC, ngspiceSupport has been renamed to withNgspice, and scriptingSupport has been renamed to withScripting. Additionally, kicad/base.nix no longer provides default argument values since these are provided by kicad/default.nix.

  • The socket for the pdns-recursor module was moved from /var/lib/pdns-recursor to /run/pdns-recursor to match upstream.

B.1.4. Other Notable Changes

  • The default-version of nextcloud is nextcloud20. Please note that it's not possible to upgrade nextcloud across multiple major versions! This means that it's e.g. not possible to upgrade from nextcloud18 to nextcloud20 in a single deploy.

    The package can be manually upgraded by setting services.nextcloud.package to nextcloud20.

B.2. Release 20.09 (“Nightingale”, 2020.09/??)

B.2.1. Highlights

In addition to numerous new and upgraded packages, this release has the following highlights:

  • Support is planned until the end of April 2021, handing over to 21.03.

  • GNOME desktop environment was upgraded to 3.36, see its release notes.

  • The Cinnamon desktop environment (v4.6) has been added. services.xserver.desktopManager.cinnamon.enable = true; to try it out! Remember that, with any new feature it's possible you could run into issues, so please send all support requests to to notify the maintainers.

  • Quickly configure a complete, private, self-hosted video conferencing solution with the new Jitsi Meet module.

  • maxx package removed along with services.xserver.desktopManager.maxx module. Please migrate to cdesktopenv and services.xserver.desktopManager.cde module.

  • We now distribute a GNOME ISO.

  • PHP now defaults to PHP 7.4, updated from 7.3.

  • PHP 7.2 is no longer supported due to upstream not supporting this version for the entire lifecycle of the 20.09 release.

  • Python 3 now defaults to Python 3.8 instead of 3.7.

  • Python 3.5 has reached its upstream EOL at the end of September 2020: it has been removed from the list of available packages.

  • Two new options, authorizedKeysCommand and authorizedKeysCommandUser, have been added to the openssh module. If you have AuthorizedKeysCommand in your services.openssh.extraConfig you should make use of these new options instead.

  • There is a new module for Podman(virtualisation.podman), a drop-in replacement for the Docker command line.

  • The new virtualisation.containers module manages configuration shared by the CRI-O and Podman modules.

  • Declarative Docker containers are renamed from docker-containers to virtualisation.oci-containers.containers. This is to make it possible to use podman instead of docker.

  • MariaDB has been updated to 10.4, MariaDB Galera to 26.4. Before you upgrade, it would be best to take a backup of your database. For MariaDB Galera Cluster, see Upgrading from MariaDB 10.3 to MariaDB 10.4 with Galera Cluster instead. Before doing the upgrade read Incompatible Changes Between 10.3 and 10.4. After the upgrade you will need to run mysql_upgrade. MariaDB 10.4 introduces a number of changes to the authentication process, intended to make things easier and more intuitive. See Authentication from MariaDB 10.4. unix_socket auth plugin does not use a password, and uses the connecting user's UID instead. When a new MariaDB data directory is initialized, two MariaDB users are created and can be used with new unix_socket auth plugin, as well as traditional mysql_native_password plugin: root@localhost and mysql@localhost. To actually use the traditional mysql_native_password plugin method, one must run the following:

    services.mysql.initialScript = pkgs.writeText "mariadb-init.sql" ''
      ALTER USER root@localhost IDENTIFIED VIA mysql_native_password USING PASSWORD("verysecret");

    When MariaDB data directory is just upgraded (not initialized), the users are not created or modified.

  • MySQL server is now started with additional systemd sandbox/hardening options for better security. The PrivateTmp, ProtectHome, and ProtectSystem options may be problematic when MySQL is attempting to read from or write to your filesystem anywhere outside of its own state directory, for example when calling LOAD DATA INFILE or SELECT * INTO OUTFILE. In this scenario a variant of the following may be required: - allow MySQL to read from /home and /tmp directories when using LOAD DATA INFILE = lib.mkForce "read-only";

    - allow MySQL to write to custom folder /var/data when using SELECT * INTO OUTFILE, assuming the mysql user has write access to /var/data = [ "/var/data" ];

    The MySQL service no longer runs its systemd service startup script as root anymore. A dedicated non root super user account is required for operation. This means users with an existing MySQL or MariaDB database server are required to run the following SQL statements as a super admin user before upgrading:

    CREATE USER IF NOT EXISTS 'mysql'@'localhost' identified with unix_socket;

    If you use MySQL instead of MariaDB please replace unix_socket with auth_socket. If you have changed the value of services.mysql.user from the default of mysql to a different user please change 'mysql'@'localhost' to the corresponding user instead.

  • The new option has been added to automatically generate the man-db caches, which are needed by utilities like whatis and apropos. The caches are generated during the build of the NixOS configuration: since this can be expensive when a large number of packages are installed, the feature is disabled by default.

  • services.postfix.sslCACert was replaced by services.postfix.tlsTrustedAuthorities which now defaults to system certificate authorities.

  • Subordinate GID and UID mappings are now set up automatically for all normal users. This will make container tools like Podman work as non-root users out of the box.

  • The various documented workarounds to use steam have been converted to a module. programs.steam.enable enables steam, controller support and the workarounds.

  • Support for built-in LCDs in various pieces of Logitech hardware (keyboards and USB speakers). hardware.logitech.lcd.enable enables support for all hardware supported by the g15daemon project.

  • Zabbix now defaults to 5.0, updated from 4.4. Please carefully read through the upgrade guide and apply any changes required. Be sure to take special note of the section on enabling extended range of numeric (float) values as you will need to apply this database migration manually.

    If you are using Zabbix Server with a MySQL or MariaDB database you should note that using a character set of utf8 and a collate of utf8_bin has become mandatory with this release. See the upstream issue for further discussion. Before upgrading you should check the character set and collation used by your database and ensure they are correct:

        schema_name = 'zabbix';

    If these values are not correct you should take a backup of your database and convert the character set and collation as required. Here is an example of how to do so, taken from the Zabbix forums:

      -- the following will produce a list of SQL commands you should subsequently execute
      FROM information_schema.`COLUMNS`
      WHERE table_schema = "zabbix" AND COLLATION_NAME = "utf8_general_ci";

  • The NixOS module system now supports freeform modules as a mix between types.attrsOf and types.submodule. These allow you to explicitly declare a subset of options while still permitting definitions without an associated option. See Section 51.8, “Freeform modules” for how to use them.

  • The GRUB module gained support for basic password protection, which allows to restrict non-default entries in the boot menu to one or more users. The users and passwords are defined via the option boot.loader.grub.users. Note: Password support is only avaiable in GRUB version 2.

  • Following its deprecation in 20.03, the Perl NixOS test driver has been removed. All remaining tests have been ported to the Python test framework. Code outside nixpkgs using make-test.nix or testing.nix needs to be ported to make-test-python.nix and testing-python.nix respectively.

B.2.2. New Services

The following new services were added since the last release:

  • There is a new security.doas.enable module that provides doas, a lighter alternative to sudo with many of the same features.

  • Hercules CI Agent is a specialized build agent for projects built with Nix. See the options and setup.

B.2.3. Backward Incompatibilities

When upgrading from a previous release, please be aware of the following incompatible changes:

  • The matrix-synapse module no longer includes optional dependencies by default, they have to be added through the plugins option.

  • buildGoModule now internally creates a vendor directory in the source tree for downloaded modules instead of using go's module proxy protocol. This storage format is simpler and therefore less likely to break with future versions of go. As a result buildGoModule switched from modSha256 to the vendorSha256 attribute to pin fetched version data.

  • Grafana is now built without support for phantomjs by default. Phantomjs support has been deprecated in Grafana and the phantomjs project is currently unmaintained. It can still be enabled by providing phantomJsSupport = true to the package instantiation:

      services.grafana.package = pkgs.grafana.overrideAttrs (oldAttrs: rec {
        phantomJsSupport = false;

  • The supybot module now uses /var/lib/supybot as its default stateDir path if stateVersion is 20.09 or higher. It also enables a number of systemd sandboxing options which may possibly interfere with some plugins. If this is the case you can disable the options through attributes in

  • The security.duosec.skey option, which stored a secret in the nix store, has been replaced by a new security.duosec.secretKeyFile option for better security.

    security.duosec.ikey has been renamed to security.duosec.integrationKey.

  • vmware has been removed from the services.x11.videoDrivers defaults. For VMWare guests set virtualisation.vmware.guest.enable to true which will include the appropriate drivers.

  • The initrd SSH support now uses OpenSSH rather than Dropbear to allow the use of Ed25519 keys and other OpenSSH-specific functionality. Host keys must now be in the OpenSSH format, and at least one pre-generated key must be specified.

    If you used the*Key options, you'll get an error explaining how to convert your host keys and migrate to the new option. Otherwise, if you don't have any host keys set, you'll need to generate some; see the hostKeys option documentation for instructions.

  • Since this release there's an easy way to customize your PHP install to get a much smaller base PHP with only wanted extensions enabled. See the following snippet installing a smaller PHP with the extensions imagick, opcache, pdo and pdo_mysql loaded:

    environment.systemPackages = [
        ({ all, ... }: with all; [

    The default php attribute hasn't lost any extensions. The opcache extension has been added. All upstream PHP extensions are available under php.extensions.<name?>.

    All PHP config flags have been removed for the following reasons:

    • The updated php attribute is now easily customizable to your liking by using php.withExtensions or php.buildEnv instead of writing config files or changing configure flags.

    • The remaining configuration flags can now be set directly on the php attribute. For example, instead of

      php.override {
        config.php.embed = true;
        config.php.apxs2 = false;

      you should now write

      php.override {
        embedSupport = true;
        apxs2Support = false;

  • The ACME module has been overhauled for simplicity and maintainability. Cert generation now implicitly uses the acme user, and the security.acme.certs._name_.user option has been removed. Instead, certificate access from other services is now managed through group permissions. The module no longer runs lego twice under certain conditions, and will correctly renew certificates if their configuration is changed. Services which reload nginx and httpd after certificate renewal are now properly configured too so you no longer have to do this manually if you are using HTTPS enabled virtual hosts. A mechanism for regenerating certs on demand has also been added and documented.

  • Gollum received a major update to version 5.x and you may have to change some links in your wiki when migrating from gollum 4.x. More information can be found here.

  • Deluge 2.x was added and is used as default for new NixOS installations where stateVersion is >= 20.09. If you are upgrading from a previous NixOS version, you can set service.deluge.package = pkgs.deluge-2_x to upgrade to Deluge 2.x and migrate the state to the new format. Be aware that backwards state migrations are not supported by Deluge.

  • Nginx web server now starting with additional sandbox/hardening options. By default, write access to services.nginx.stateDir is allowed. To allow writing to other folders, use = [ "/var/www" ];

  • The NixOS options nesting.clone and nesting.children have been deleted, and replaced with named specialisation configurations.

    Replace a nesting.clone entry with:

    specialisation.example-sub-configuration = {
      configuration = {

    Replace a nesting.children entry with:

    specialisation.example-sub-configuration = {
      inheritParentConfig = false;
      configuration = {

    To switch to a specialised configuration at runtime you need to run:

    # sudo /run/current-system/specialisation/example-sub-configuration/bin/switch-to-configuration test

    Before you would have used:

    # sudo /run/current-system/fine-tune/child-1/bin/switch-to-configuration test

  • The Nginx log directory has been moved to /var/log/nginx, the cache directory to /var/cache/nginx. The option services.nginx.stateDir has been removed.

  • The httpd web server previously started its main process as root privileged, then ran worker processes as a less privileged identity user. This was changed to start all of httpd as a less privileged user (defined by services.httpd.user and As a consequence, all files that are needed for httpd to run (included configuration fragments, SSL certificates and keys, etc.) must now be readable by this less privileged user/group.

    The default value for services.httpd.mpm has been changed from prefork to event. Along with this change the default value for services.httpd.virtualHosts.<name>.http2 has been set to true.

  • The systemd-networkd option<name>.dhcp.CriticalConnection has been removed following upstream systemd's deprecation of the same. It is recommended to use<name>.networkConfig.KeepConfiguration instead. See for details.

  • The systemd-networkd option has been renamed to<name>.dhcpV4Config following upstream systemd's documentation change. See for details.

  • In the picom module, several options that accepted floating point numbers encoded as strings (for example services.picom.activeOpacity) have been changed to the (relatively) new native float type. To migrate your configuration simply remove the quotes around the numbers.

  • When using buildBazelPackage from Nixpkgs, flat hash mode is now used for dependencies instead of recursive. This is to better allow using hashed mirrors where needed. As a result, these hashes will have changed.

  • The rkt module has been removed, it was archived by upstream.

  • The Bazaar VCS is unmaintained and, as consequence of the Python 2 EOL, the packages bazaar and bazaarTools were removed. Breezy, the backward compatible fork of Bazaar (see the announcement), was packaged as breezy and can be used instead.

    Regarding Nixpkgs, fetchbzr, nix-prefetch-bzr and Bazaar support in Hydra will continue to work through Breezy.

  • In addition to the hostname, the fully qualified domain name (FQDN), which consists of ${networking.hostName} and ${networking.domain} is now added to /etc/hosts, to allow local FQDN resolution, as used by the hostname --fqdn command and other applications that try to determine the FQDN. These new entries take precedence over entries from the DNS which could cause regressions in some very specific setups. Additionally the hostname is now resolved to instead of to be consistent with what nss-myhostname (from systemd) returns. The old behaviour can e.g. be restored by using networking.hosts = lib.mkForce { "" = [ config.networking.hostName ]; };.

  • The hostname (networking.hostName) must now be a valid DNS label (see RFC 1035, RFC 1123) and as such must not contain the domain part. This means that the hostname must start with a letter or digit, end with a letter or digit, and have as interior characters only letters, digits, and hyphen. The maximum length is 63 characters. Additionally it is recommended to only use lower-case characters. If (e.g. for legacy reasons) a FQDN is required as the Linux kernel network node hostname (uname --nodename) the option boot.kernel.sysctl."kernel.hostname" can be used as a workaround (but be aware of the 64 character limit).

  • The GRUB specific option boot.loader.grub.extraInitrd has been replaced with the generic option boot.initrd.secrets. This option creates a secondary initrd from the specified files, rather than using a manually created initrd file. Due to an existing bug with boot.loader.grub.extraInitrd, it is not possible to directly boot an older generation that used that option. It is still possible to rollback to that generation if the required initrd file has not been deleted.

  • The DNSChain package and NixOS module have been removed from Nixpkgs as the software is unmaintained and can't be built. For more information see issue #89205.

  • In the resilio module, services.resilio.httpListenAddr has been changed to listen to [::1] instead of

  • Users of OpenAFS 1.6 must upgrade their services to OpenAFS 1.8! In this release, the OpenAFS package version 1.6.24 is marked broken but can be used during transition to OpenAFS 1.8.x. Use the options services.openafsClient.packages.module, services.openafsClient.packages.programs and services.openafsServer.package to select a different OpenAFS package. OpenAFS 1.6 will be removed in the next release. The package openafs and the service options will then silently point to the OpenAFS 1.8 release.

    See also the OpenAFS Administrator Guide for instructions. Beware of the following when updating servers:

    • The storage format of the server key has changed and the key must be converted before running the new release.

    • When updating multiple database servers, turn off the database servers from the highest IP down to the lowest with resting periods in between. Start up in reverse order. Do not concurrently run database servers working with different OpenAFS releases!

    • Update servers first, then clients.

  • Radicale's default package has changed from 2.x to 3.x. An upgrade checklist can be found here. You can use the newer version in the NixOS service by setting the package to radicale3, which is done automatically if stateVersion is 20.09 or higher.

  • udpt experienced a complete rewrite from C++ to rust. The configuration format changed from ini to toml. The new configuration documentation can be found at the official website and example configuration is packaged in ${udpt}/share/udpt/udpt.toml.

  • We now have a unified services.xserver.displayManager.autoLogin option interface to be used for every display-manager in NixOS.

  • The bitcoind module has changed to multi-instance, using submodules. Therefore, it is now mandatory to name each instance. To use this new multi-instance config with an existing bitcoind data directory and user, you have to adjust the original config, e.g.:

      services.bitcoind = {
        enable = true;
        extraConfig = "...";

    To something similar:

      services.bitcoind.mainnet = {
        enable = true;
        dataDir = "/var/lib/bitcoind";
        user = "bitcoin";
        extraConfig = "...";

    The key settings are:

    • dataDir - to continue using the same data directory.

    • user - to continue using the same user so that bitcoind maintains access to its files.

  • Graylog introduced a change in the LDAP server certificate validation behaviour for version 3.3.3 which might break existing setups. When updating Graylog from a version before 3.3.3 make sure to check the Graylog release info for information on how to avoid the issue.

  • The dokuwiki module has changed to multi-instance, using submodules. Therefore, it is now mandatory to name each instance. Moreover, forcing SSL by default has been dropped, so nginx.forceSSL and nginx.enableACME are no longer set to true. To continue using your service with the original SSL settings, you have to adjust the original config, e.g.:

    services.dokuwiki = {
      enable = true;

    To something similar:

    services.dokuwiki."mywiki" = {
      enable = true;
      nginx = {
        forceSSL = true;
        enableACME = true;

    The base package has also been upgraded to the 2020-07-29 "Hogfather" release. Plugins might be incompatible or require upgrading.

  • The services.postgresql.dataDir option is now set to "/var/lib/postgresql/${cfg.package.psqlSchema}" regardless of your system.stateVersion. Users with an existing postgresql install that have a system.stateVersion of 17.03 or below should double check what the value of their services.postgresql.dataDir option is (/var/db/postgresql) and then explicitly set this value to maintain compatibility:

    services.postgresql.dataDir = "/var/db/postgresql";

    The postgresql module now expects there to be a database super user account called postgres regardless of your system.stateVersion. Users with an existing postgresql install that have a system.stateVersion of 17.03 or below should run the following SQL statements as a database super admin user before upgrading:


  • The USBGuard module now removes options and instead hardcodes values for IPCAccessControlFiles, ruleFiles, and auditFilePath. Audit logs can be found in the journal.

  • The NixOS module system now evaluates option definitions more strictly, allowing it to detect a larger set of problems. As a result, what previously evaluated may not do so anymore. See the PR that changed this for more info.

  • For NixOS configuration options, the type loaOf, after its initial deprecation in release 20.03, has been removed. In NixOS and Nixpkgs options using this type have been converted to attrsOf. For more information on this change have look at these links: issue #1800, PR #63103.

  •${name}.path now returns a list of paths instead of a colon-separated string.

  • Caddy module now uses Caddy v2 by default. Caddy v1 can still be used by setting services.caddy.package to pkgs.caddy1.

    New option services.caddy.adapter has been added.

  • The jellyfin module will use and stay on the Jellyfin version 10.5.5 if stateVersion is lower than 20.09. This is because significant changes were made to the database schema, and it is highly recommended to backup your instance before upgrading. After making your backup, you can upgrade to the latest version either by setting your stateVersion to 20.09 or higher, or set the services.jellyfin.package to pkgs.jellyfin. If you do not wish to upgrade Jellyfin, but want to change your stateVersion, you can set the value of services.jellyfin.package to pkgs.jellyfin_10_5.

  • The security.rngd service is now disabled by default. This choice was made because there's krngd in the linux kernel space making it (for most usecases) functionally redundent.

  • The hardware.nvidia.optimus_prime.enable service has been renamed to and has many new enhancements. Related nvidia prime settings may have also changed.

  • The package nextcloud17 has been removed and nextcloud18 was marked as insecure since both of them will will be EOL (end of life) within the lifetime of 20.09.

    It's necessary to upgrade to nextcloud19:

    • From nextcloud17, you have to upgrade to nextcloud18 first as Nextcloud doesn't allow going multiple major revisions forward in a single upgrade. This is possible by setting services.nextcloud.package to nextcloud18.

    • From nextcloud18, it's possible to directly upgrade to nextcloud19 by setting services.nextcloud.package to nextcloud19.

  • The GNOME desktop manager no longer default installs gnome3.epiphany. It was chosen to do this as it has a usability breaking issue (see issue #98819) that makes it unsuitable to be a default app.

B.2.4. Other Notable Changes

  • SD images are now compressed by default using zstd. The compression for ISO images has also been changed to zstd, but ISO images are still not compressed by default.

  • services.journald.rateLimitBurst was updated from 1000 to 10000 to follow the new upstream systemd default.

  • The notmuch package move its emacs-related binaries and emacs lisp files to a separate output. They're not part of the default out output anymore - if you relied on the notmuch-emacs-mua binary or the emacs lisp files, access them via the notmuch.emacs output. Device tree overlay support was improved in #79370 and now uses hardware.deviceTree.kernelPackage instead of hardware.deviceTree.base. hardware.deviceTree.overlays configuration was extended to support .dts files with symbols. Device trees can now be filtered by setting hardware.deviceTree.filter option.

  • The default output of buildGoPackage is now $out instead of $bin.

  • buildGoModule doCheck now defaults to true.

  • Packages built using buildRustPackage now use release mode for the checkPhase by default.

    Please note that Rust packages utilizing a custom build/install procedure (e.g. by using a Makefile) or test suites that rely on the structure of the target/ directory may break due to those assumptions. For further information, please read the Rust section in the Nixpkgs manual.

  • The cc- and binutils-wrapper's "infix salt" and _BUILD_ and _TARGET_ user infixes have been replaced with with a "suffix salt" and suffixes and _FOR_BUILD and _FOR_TARGET. This matches the autotools convention for env vars which standard for these things, making interfacing with other tools easier.

  • Additional Git documentation (HTML and text files) is now available via the git-doc package.

  • Default algorithm for ZRAM swap was changed to zstd.

  • The installer now enables sshd by default. This improves installation on headless machines especially ARM single-board-computer. To login through ssh, either a password or an ssh key must be set for the root user or the nixos user.

  • The scripted networking system now uses .link files in /etc/systemd/network to configure mac address and link MTU, instead of the sometimes buggy network-link-* units, which have been removed. Bringing the interface up has been moved to the beginning of the network-addresses-* unit. Note this doesn't require systemd-networkd - it's udev that parses .link files. Extra care needs to be taken in the presence of legacy udev rules to rename interfaces, as MAC Address and MTU defined in these options can only match on the original link name. In such cases, you most likely want to create a 10-*.link file through and set both name and MAC Address / MTU there.

  • Grafana received a major update to version 7.x. A plugin is now needed for image rendering support, and plugins must now be signed by default. More information can be found in the Grafana documentation.

  • The hardware.u2f module, which was installing udev rules was removed, as udev gained native support to handle FIDO security tokens.

  • The services.transmission module was enhanced with the new options: services.transmission.credentialsFile, services.transmission.openFirewall, and services.transmission.performanceNetParameters.

    transmission-daemon is now started with additional systemd sandbox/hardening options for better security. Please report any use case where this is not working well. In particular, the RootDirectory option newly set forbids uploading or downloading a torrent outside of the default directory configured at If you really need Transmission to access other directories, you must include those directories into the BindPaths of the service: = [ "/path/to/alternative/download-dir" ];

    Also, connection to the RPC (Remote Procedure Call) of transmission-daemon is now only available on the local network interface by default. Use:

    services.transmission.settings.rpc-bind-address = "";

    to get the previous behavior of listening on all network interfaces.

  • With this release systemd-networkd (when enabled through networking.useNetworkd) has it's netlink socket created through a systemd.socket unit. This gives us control over socket buffer sizes and other parameters. For larger setups where networkd has to create a lot of (virtual) devices the default buffer size (currently 128MB) is not enough.

    On a machine with >100 virtual interfaces (e.g., wireguard tunnels, VLANs, …), that all have to be brought up during system startup, the receive buffer size will spike for a brief period. Eventually some of the message will be dropped since there is not enough (permitted) buffer space available.

    By having systemd-networkd start with a netlink socket created by systemd we can configure the ReceiveBufferSize= parameter in the socket options (i.e. systemd.sockets.systemd-networkd.socketOptions.ReceiveBufferSize) without recompiling systemd-networkd.

    Since the actual memory requirements depend on hardware, timing, exact configurations etc. it isn't currently possible to infer a good default from within the NixOS module system. Administrators are advised to monitor the logs of systemd-networkd for rtnl: kernel receive buffer overrun spam and increase the memory limit as they see fit.

    Note: Increasing the ReceiveBufferSize= doesn't allocate any memory. It just increases the upper bound on the kernel side. The memory allocation depends on the amount of messages that are queued on the kernel side of the netlink socket.

  • Specifying mailboxes in the dovecot2 module as a list is deprecated and will break eval in 21.03. Instead, an attribute-set should be specified where the name should be the key of the attribute.

    This means that a configuration like this

      services.dovecot2.mailboxes = [
        { name = "Junk";
          auto = "create";

    should now look like this:

      services.dovecot2.mailboxes = { = "create";

  • netbeans was upgraded to 12.0 and now defaults to OpenJDK 11. This might cause problems if your projects depend on packages that were removed in Java 11.

  • nextcloud has been updated to v19.

    If you have an existing installation, please make sure that you're on nextcloud18 before upgrading to nextcloud19 since Nextcloud doesn't support upgrades across multiple major versions.

  • The nixos-run-vms script now deletes the previous run machines states on test startup. You can use the --keep-vm-state flag to match the previous behaviour and keep the same VM state between different test runs.

  • The nix.buildMachines option is now type-checked. There are no functional changes, however this may require updating some configurations to use correct types for all attributes.

  • The fontconfig module stopped generating config and cache files for fontconfig 2.10.x, the /etc/fonts/fonts.conf now belongs to the latest fontconfig, just like on other Linux distributions, and we will no longer be versioning the config directories.

    Fontconfig 2.10.x was removed from Nixpkgs since it hasn’t been used in any Nixpkgs package for years now.

  • Nginx module nginxModules.fastcgi-cache-purge renamed to official name nginxModules.cache-purge. Nginx module nginxModules.ngx_aws_auth renamed to official name

  • The option defaultPackages was added. It installs the packages perl, rsync and strace for now. They were added unconditionally to systemPackages before, but are not strictly necessary for a minimal NixOS install. You can set it to an empty list to have a more minimal system. Be aware that some functionality might still have an impure dependency on those packages, so things might break.

  • The undervolt option no longer needs to apply its settings every 30s. If they still become undone, open an issue and restore the previous behaviour using undervolt.useTimer.

  • Agda has been heavily reworked.

    • agda.mkDerivation has been heavily changed and is now located at agdaPackages.mkDerivation.

    • New top-level packages agda and agda.withPackages have been added, the second of which sets up agda with access to chosen libraries.

    • All agda libraries now live under agdaPackages.

    • Many broken libraries have been removed.

    See the new documentation for more information.

  • The deepin package set has been removed from nixpkgs. It was a work in progress to package the Deepin Desktop Environment (DDE), including libraries, tools and applications, and it was still missing a service to lauch the desktop environment. It has shown to no longer be a feasible goal due to reasons discussed in issue #94870. The package netease-cloud-music has also been removed, as it depends on libraries from deepin.

  • The opendkim module now uses systemd sandboxing features to limit the exposure of the system towards the opendkim service.

  • Kubernetes has been upgraded to 1.19.1, which also means that the golang version to build it has been bumped to 1.15. This may have consequences for your existing clusters and their certificates. Please consider the release notes for Kubernetes 1.19 carefully before upgrading.

  • For AMD GPUs, Vulkan can now be used by adding amdvlk to hardware.opengl.extraPackages.

  • Similarly, still for AMD GPUs, the ROCm OpenCL stack can now be used by adding rocm-opencl-icd to hardware.opengl.extraPackages.

B.3. Release 20.03 (“Markhor”, 2020.04/20)

B.3.1. Highlights

In addition to numerous new and upgraded packages, this release has the following highlights:

  • Support is planned until the end of October 2020, handing over to 20.09.

  • Core version changes:

    gcc: 8.3.0 -> 9.2.0

    glibc: 2.27 -> 2.30

    linux: 4.19 -> 5.4

    mesa: 19.1.5 -> 19.3.3

    openssl: 1.0.2u -> 1.1.1d

  • Desktop version changes:

    plasma5: 5.16.5 -> 5.17.5

    kdeApplications: 19.08.2 -> 19.12.3

    gnome3: 3.32 -> 3.34

    pantheon: 5.0 -> 5.1.3

  • Linux kernel is updated to branch 5.4 by default (from 4.19).

  • Postgresql for NixOS service now defaults to v11.

  • The graphical installer image starts the graphical session automatically. Before you'd be greeted by a tty and asked to enter systemctl start display-manager. It is now possible to disable the display-manager from running by selecting the Disable display-manager quirk in the boot menu.

  • GNOME 3 has been upgraded to 3.34. Please take a look at their Release Notes for details.

  • If you enable the Pantheon Desktop Manager via services.xserver.desktopManager.pantheon.enable, we now default to also use Pantheon's newly designed greeter . Contrary to NixOS's usual update policy, Pantheon will receive updates during the cycle of NixOS 20.03 when backwards compatible.

  • By default zfs pools will now be trimmed on a weekly basis. Trimming is only done on supported devices (i.e. NVME or SSDs) and should improve throughput and lifetime of these devices. It is controlled by the services.zfs.trim.enable varname. The zfs scrub service (services.zfs.autoScrub.enable) and the zfs autosnapshot service (services.zfs.autoSnapshot.enable) are now only enabled if zfs is set in config.boot.initrd.supportedFilesystems or config.boot.supportedFilesystems. These lists will automatically contain zfs as soon as any zfs mountpoint is configured in fileSystems.

  • nixos-option has been rewritten in C++, speeding it up, improving correctness, and adding a -r option which prints all options and their values recursively.

  • services.xserver.desktopManager.default and services.xserver.windowManager.default options were replaced by a single services.xserver.displayManager.defaultSession option to improve support for upstream session files. If you used something like:

    services.xserver.desktopManager.default = "xfce";
    services.xserver.windowManager.default = "icewm";

    you should change it to:

    services.xserver.displayManager.defaultSession = "xfce+icewm";

  • The testing driver implementation in NixOS is now in Python make-test-python.nix. This was done by Jacek Galowicz (@tfc), and with the collaboration of Julian Stecklina (@blitz) and Jana Traue (@jtraue). All documentation has been updated to use this testing driver, and a vast majority of the 286 tests in NixOS were ported to python driver. In 20.09 the Perl driver implementation, make-test.nix, is slated for removal. This should give users of the NixOS integration framework a transitory period to rewrite their tests to use the Python implementation. Users of the Perl driver will see this warning everytime they use it:

    $ warning: Perl VM tests are deprecated and will be removed for 20.09.
    Please update your tests to use the python test driver.
    See for details.

    API compatibility is planned to be kept for at least the next release with the perl driver.

B.3.2. New Services

The following new services were added since the last release:

  • The kubernetes kube-proxy now supports a new hostname configuration services.kubernetes.proxy.hostname which has to be set if the hostname of the node should be non default.

  • UPower's configuration is now managed by NixOS and can be customized via services.upower.

  • To use Geary you should enable programs.geary.enable instead of just adding it to environment.systemPackages. It was created so Geary could function properly outside of GNOME.

  • ./config/console.nix

  • ./hardware/brillo.nix

  • ./hardware/tuxedo-keyboard.nix

  • ./programs/bandwhich.nix

  • ./programs/bash-my-aws.nix

  • ./programs/liboping.nix

  • ./programs/traceroute.nix

  • ./services/backup/sanoid.nix

  • ./services/backup/syncoid.nix

  • ./services/backup/zfs-replication.nix

  • ./services/continuous-integration/buildkite-agents.nix

  • ./services/databases/victoriametrics.nix

  • ./services/desktops/gnome3/gnome-initial-setup.nix

  • ./services/desktops/neard.nix

  • ./services/games/openarena.nix

  • ./services/hardware/fancontrol.nix

  • ./services/mail/sympa.nix

  • ./services/misc/freeswitch.nix

  • ./services/misc/mame.nix

  • ./services/monitoring/do-agent.nix

  • ./services/monitoring/prometheus/xmpp-alerts.nix

  • ./services/network-filesystems/orangefs/server.nix

  • ./services/network-filesystems/orangefs/client.nix

  • ./services/networking/3proxy.nix

  • ./services/networking/corerad.nix

  • ./services/networking/go-shadowsocks2.nix

  • ./services/networking/ntp/openntpd.nix

  • ./services/networking/shorewall.nix

  • ./services/networking/shorewall6.nix

  • ./services/networking/spacecookie.nix

  • ./services/networking/trickster.nix

  • ./services/networking/v2ray.nix

  • ./services/networking/xandikos.nix

  • ./services/networking/yggdrasil.nix

  • ./services/web-apps/dokuwiki.nix

  • ./services/web-apps/gotify-server.nix

  • ./services/web-apps/grocy.nix

  • ./services/web-apps/ihatemoney

  • ./services/web-apps/moinmoin.nix

  • ./services/web-apps/trac.nix

  • ./services/web-apps/trilium.nix

  • ./services/web-apps/shiori.nix

  • ./services/web-servers/ttyd.nix

  • ./services/x11/picom.nix

  • ./services/x11/hardware/digimend.nix

  • ./services/x11/imwheel.nix

  • ./virtualisation/cri-o.nix

B.3.3. Backward Incompatibilities

When upgrading from a previous release, please be aware of the following incompatible changes:

  • The dhcpcd package does not request IPv4 addresses for tap and bridge interfaces anymore by default. In order to still get an address on a bridge interface, one has to disable networking.useDHCP and explicitly enable networking.interfaces.<name>.useDHCP on every interface, that should get an address via DHCP. This way, dhcpcd is configured in an explicit way about which interface to run on.

  • GnuPG is now built without support for a graphical passphrase entry by default. Please enable the gpg-agent user service via the NixOS option programs.gnupg.agent.enable. Note that upstream recommends using gpg-agent and will spawn a gpg-agent on the first invocation of GnuPG anyway.

  • The dynamicHosts option has been removed from the NetworkManager module. Allowing (multiple) regular users to override host entries affecting the whole system opens up a huge attack vector. There seem to be very rare cases where this might be useful. Consider setting system-wide host entries using networking.hosts, provide them via the DNS server in your network, or use environment.etc to add a file into /etc/NetworkManager/dnsmasq.d reconfiguring hostsdir.

  • The file was removed. Matching all network interfaces caused many breakages, see #18962 and #71106.

    We already don't support the global networking.useDHCP, networking.defaultGateway and networking.defaultGateway6 options if networking.useNetworkd is enabled, but direct users to configure the per-device networking.interfaces.<name>.… options.

  • The stdenv now runs all bash with set -u, to catch the use of undefined variables. Before, it itself used set -u but was careful to unset it so other packages' code ran as before. Now, all bash code is held to the same high standard, and the rather complex stateful manipulation of the options can be discarded.

  • The SLIM Display Manager has been removed, as it has been unmaintained since 2013. Consider migrating to a different display manager such as LightDM (current default in NixOS), SDDM, GDM, or using the startx module which uses Xinitrc.

  • The Way Cooler wayland compositor has been removed, as the project has been officially canceled. There are no more way-cooler attribute and programs.way-cooler options.

  • The BEAM package set has been deleted. You will only find there the different interpreters. You should now use the different build tools coming with the languages with sandbox mode disabled.

  • There is now only one Xfce package-set and module. This means that attributes xfce4-14 and xfceUnstable all now point to the latest Xfce 4.14 packages. And in the future NixOS releases will be the latest released version of Xfce available at the time of the release's development (if viable).

  • The phpfpm module now sets PrivateTmp=true in its systemd units for better process isolation. If you rely on /tmp being shared with other services, explicitly override this by setting serviceConfig.PrivateTmp to false for each phpfpm unit.

  • KDE’s old multimedia framework Phonon no longer supports Qt 4. For that reason, Plasma desktop also does not have enableQt4Support option any more.

  • The BeeGFS module has been removed.

  • The osquery module has been removed.

  • Going forward, ~/bin in the users home directory will no longer be in PATH by default. If you depend on this you should set the option environment.homeBinInPath to true. The aforementioned option was added this release.

  • The buildRustCrate infrastructure now produces lib outputs in addition to the out output. This has led to drastically reduced closure sizes for some rust crates since development dependencies are now in the lib output.

  • Pango was upgraded to 1.44, which no longer uses freetype for font loading. This means that type1 and bitmap fonts are no longer supported in applications relying on Pango for font rendering (notably, GTK application). See upstream issue for more information.

  • The roundcube module has been hardened.

    • The password of the database is not written world readable in the store any more. If is set to localhost, then a unix user of the same name as the database will be created and PostreSQL peer authentication will be used, removing the need for a password. Otherwise, a password is still needed and can be provided with the new option database.passwordFile, which should be set to the path of a file containing the password and readable by the user nginx only. The database.password option is insecure and deprecated. Usage of this option will print a warning.

    • A random des_key is set by default in the configuration of roundcube, instead of using the hardcoded and insecure default. To ensure a clean migration, all users will be logged out when you upgrade to this release.

  • The packages openobex and obexftp are no longer installed when enabling Bluetooth via hardware.bluetooth.enable.

  • The dump1090 derivation has been changed to use FlightAware's dump1090 as its upstream. However, this version does not have an internal webserver anymore. The assets in the share/dump1090 directory of the derivation can be used in conjunction with an external webserver to replace this functionality.

  • The fourStore and fourStoreEndpoint modules have been removed.

  • Polkit no longer has the user of uid 0 (root) as an admin identity. We now follow the upstream default of only having every member of the wheel group admin privileged. Before it was root and members of wheel. The positive outcome of this is pkexec GUI popups or terminal prompts will no longer require the user to choose between two essentially equivalent choices (whether to perform the action as themselves with wheel permissions, or as the root user).

  • NixOS containers no longer build NixOS manual by default. This saves evaluation time, especially if there are many declarative containers defined. Note that this is already done when <nixos/modules/profiles/minimal.nix> module is included in container config.

  • The kresd services deprecates the interfaces option in favor of the listenPlain option which requires full systemd.socket compatible declaration which always include a port.

  • Virtual console options have been reorganized and can be found under a single top-level attribute: console. The full set of changes is as follows:

  • The awstats module has been rewritten to serve stats via static html pages, updated on a timer, over nginx, instead of dynamic cgi pages over apache.

    Minor changes will be required to migrate existing configurations. Details of the required changes can seen by looking through the awstats module.

  • The httpd module no longer provides options to support serving web content without defining a virtual host. As a result of this the services.httpd.logPerVirtualHost option now defaults to true instead of false. Please update your configuration to make use of services.httpd.virtualHosts.

    The services.httpd.virtualHosts.<name> option has changed type from a list of submodules to an attribute set of submodules, better matching services.nginx.virtualHosts.<name>.

    This change comes with the addition of the following options which mimic the functionality of their nginx counterparts: services.httpd.virtualHosts.<name>.addSSL, services.httpd.virtualHosts.<name>.forceSSL, services.httpd.virtualHosts.<name>.onlySSL, services.httpd.virtualHosts.<name>.enableACME, services.httpd.virtualHosts.<name>.acmeRoot, and services.httpd.virtualHosts.<name>.useACMEHost.

  • For NixOS configuration options, the loaOf type has been deprecated and will be removed in a future release. In nixpkgs, options of this type will be changed to attrsOf instead. If you were using one of these in your configuration, you will see a warning suggesting what changes will be required.

    For example, users.users is a loaOf option that is commonly used as follows:

    users.users =
      [ { name = "me";
          description = "My personal user.";
          isNormalUser = true;

    This should be rewritten by removing the list and using the value of name as the name of the attribute set: =
      { description = "My personal user.";
        isNormalUser = true;

    For more information on this change have look at these links: issue #1800, PR #63103.

  • For NixOS modules, the types types.submodule and types.submoduleWith now support paths as allowed values, similar to how imports supports paths. Because of this, if you have a module that defines an option of type either (submodule ...) path, it will break since a path is now treated as the first type instead of the second. To fix this, change the type to either path (submodule ...).

  • The Buildkite Agent module and corresponding packages have been updated to 3.x, and to support multiple instances of the agent running at the same time. This means you will have to rename services.buildkite-agent to services.buildkite-agents.<name>. Furthermore, the following options have been changed:

    • services.buildkite-agent.meta-data has been renamed to services.buildkite-agents.<name>.tags, to match upstreams naming for 3.x. Its type has also changed - it now accepts an attrset of strings.

    • Theservices.buildkite-agent.openssh.publicKeyPath option has been removed, as it's not necessary to deploy public keys to clone private repositories.

    • services.buildkite-agent.openssh.privateKeyPath has been renamed to buildkite-agents.<name>.privateSshKeyPath, as the whole openssh now only contained that single option.

    • services.buildkite-agents.<name>.shell has been introduced, allowing to specify a custom shell to be used.

  • The citrix_workspace_19_3_0 package has been removed as it will be EOLed within the lifespan of 20.03. For further information, please refer to the support and maintenance information from upstream.

  • The gcc5 and gfortran5 packages have been removed.

  • The module has been removed. It was only intended for use in internal NixOS tests, and gave the false impression of it being a special display manager when it's actually LightDM. Please use the services.xserver.displayManager.lightdm.autoLogin options instead, or any other display manager in NixOS as they all support auto-login. If you used this module specifically because it permitted root auto-login you can override the lightdm-autologin pam module like: = lib.mkForce ''
        auth     requisite
        auth     required quiet
        auth     required
        account  include   lightdm
        password include   lightdm
        session  include   lightdm

    The difference is the:

    auth required quiet

    line, where default it's:

    auth required uid >= 1000 quiet

    not permitting users with uid's below 1000 (like root). All other display managers in NixOS are configured like this.

  • There have been lots of improvements to the Mailman module. As a result,

    • The services.mailman.hyperkittyBaseUrl option has been renamed to services.mailman.hyperkitty.baseUrl.

    • The services.mailman.hyperkittyApiKey option has been removed. This is because having an option for the Hyperkitty API key meant that the API key would be stored in the world-readable Nix store, which was a security vulnerability. A new Hyperkitty API key will be generated the first time the new Hyperkitty service is run, and it will then be persisted outside of the Nix store. To continue using Hyperkitty, you must set services.mailman.hyperkitty.enable to true.

    • Additionally, some Postfix configuration must now be set manually instead of automatically by the Mailman module:

      services.postfix.relayDomains = [ "hash:/var/lib/mailman/data/postfix_domains" ];
      services.postfix.config.transport_maps = [ "hash:/var/lib/mailman/data/postfix_lmtp" ];
      services.postfix.config.local_recipient_maps = [ "hash:/var/lib/mailman/data/postfix_lmtp" ];

      This is because some users may want to include other values in these lists as well, and this was not possible if they were set automatically by the Mailman module. It would not have been possible to just concatenate values from multiple modules each setting the values they needed, because the order of elements in the list is significant.

  • The LLVM versions 3.5, 3.9 and 4 (including the corresponding CLang versions) have been dropped.

  • The networking.interfaces.*.preferTempAddress option has been replaced by networking.interfaces.*.tempAddress. The new option allows better control of the IPv6 temporary addresses, including completely disabling them for interfaces where they are not needed.

  • Rspamd was updated to version 2.2. Read the upstream migration notes carefully. Please be especially aware that some modules were removed and the default Bayes backend is now Redis.

  • The *psu versions of oraclejdk8 have been removed as they aren't provided by upstream anymore.

  • The services.dnscrypt-proxy module has been removed as it used the deprecated version of dnscrypt-proxy. We've added services.dnscrypt-proxy2.enable to use the supported version. This module supports configuration via the Nix attribute set services.dnscrypt-proxy2.settings, or by passing a TOML configuration file via services.dnscrypt-proxy2.configFile.

    # Example configuration:
    services.dnscrypt-proxy2.enable = true;
    services.dnscrypt-proxy2.settings = {
      listen_addresses = [ "" ];
      sources.public-resolvers = {
        urls = [ "" ];
        cache_file = "";
        minisign_key = "RWQf6LRCGA9i53mlYecO4IzT51TGPpvWucNSCh1CBM0QTaLn73Y7GFO3";
        refresh_delay = 72;
    services.dnsmasq.enable = true;
    services.dnsmasq.servers = [ "" ];

  • qesteidutil has been deprecated in favor of qdigidoc.

  • sqldeveloper_18 has been removed as it's not maintained anymore, sqldeveloper has been updated to version 19.4. Please note that this means that this means that the oraclejdk is now required. For further information please read the release notes.

  • Haskell env and shellFor dev shell environments now organize dependencies the same way as regular builds. In particular, rather than receiving all the different lists of dependencies mashed together as one big list, and then partitioning into Haskell and non-Hakell dependencies, they work from the original many different dependency parameters and don't need to algorithmically partition anything.

    This means that if you incorrectly categorize a dependency, e.g. non-Haskell library dependency as a buildDepends or run-time Haskell dependency as a setupDepends, whereas things would have worked before they may not work now.

  • The gcc-snapshot-package has been removed. It's marked as broken for >2 years and used to point to a fairly old snapshot from the gcc7-branch.

  • The nixos-build-vms(8)-script now uses the python test-driver.

  • The riot-web package now accepts configuration overrides as an attribute set instead of a string. A formerly used JSON configuration can be converted to an attribute set with builtins.fromJSON.

    The new default configuration also disables automatic guest account registration and analytics to improve privacy. The previous behavior can be restored by setting config.riot-web.conf = { disable_guests = false; piwik = true; }.

  • Stand-alone usage of Upower now requires services.upower.enable instead of just installing into environment.systemPackages.

  • nextcloud has been updated to v18.0.2. This means that users from NixOS 19.09 can't upgrade directly since you can only move one version forward and 19.09 uses v16.0.8.

    To provide a safe upgrade-path and to circumvent similar issues in the future, the following measures were taken:

    • The pkgs.nextcloud-attribute has been removed and replaced with versioned attributes (currently pkgs.nextcloud17 and pkgs.nextcloud18). With this change major-releases can be backported without breaking stuff and to make upgrade-paths easier.

    • Existing setups will be detected using system.stateVersion: by default, nextcloud17 will be used, but will raise a warning which notes that after that deploy it's recommended to update to the latest stable version (nextcloud18) by declaring the newly introduced setting services.nextcloud.package.

    • Users with an overlay (e.g. to use nextcloud at version v18 on 19.09) will get an evaluation error by default. This is done to ensure that our package-option doesn't select an older version by accident. It's recommended to use pkgs.nextcloud18 or to set package to pkgs.nextcloud explicitly.

    Warning: Please note that if you're coming from 19.03 or older, you have to manually upgrade to 19.09 first to upgrade your server to Nextcloud v16.
  • Hydra has gained a massive performance improvement due to some database schema changes by adding several IDs and better indexing. However, it's necessary to upgrade Hydra in multiple steps:

    • At first, an older version of Hydra needs to be deployed which adds those (nullable) columns. When having set stateVersion to a value older than 20.03, this package will be selected by default from the module when upgrading. Otherwise, the package can be deployed using the following config:

      { pkgs, ... }: {
        services.hydra.package = pkgs.hydra-migration;

    • Automatically fill the newly added ID columns on the server by running the following command:

      $ hydra-backfill-ids

      Warning: Please note that this process can take a while depending on your database-size!

    • Deploy a newer version of Hydra to activate the DB optimizations. This can be done by using hydra-unstable. This package already includes flake-support and is therefore compiled against pkgs.nixFlakes.

      Warning: If your stateVersion is set to 20.03 or greater, hydra-unstable will be used automatically! This will break your setup if you didn't run the migration.

      Please note that Hydra is currently not available with nixStable as this doesn't compile anymore.

    Warning: pkgs.hydra has been removed to ensure a graceful database-migration using the dedicated package-attributes. If you still have pkgs.hydra defined in e.g. an overlay, an assertion error will be thrown. To circumvent this, you need to set services.hydra.package to pkgs.hydra explicitly and make sure you know what you're doing!

  • The TokuDB storage engine will be disabled in mariadb 10.5. It is recommended to switch to RocksDB. See also TokuDB.

B.3.4. Other Notable Changes

  • SD images are now compressed by default using bzip2.

  • The nginx web server previously started its master process as root privileged, then ran worker processes as a less privileged identity user (the nginx user). This was changed to start all of nginx as a less privileged user (defined by services.nginx.user and As a consequence, all files that are needed for nginx to run (included configuration fragments, SSL certificates and keys, etc.) must now be readable by this less privileged user/group.

    To continue to use the old approach, you can configure:

    services.nginx.appendConfig = let cfg =; in ''user ${cfg.user} ${};''; = lib.mkForce "root";

  • OpenSSH has been upgraded from 7.9 to 8.1, improving security and adding features but with potential incompatibilities. Consult the release announcement for more information.

  • PRETTY_NAME in /etc/os-release now uses the short rather than full version string.

  • The ACME module has switched from simp-le to lego which allows us to support DNS-01 challenges and wildcard certificates. The following options have been added: security.acme.acceptTerms, security.acme.certs.<name>.dnsProvider, security.acme.certs.<name>.credentialsFile, security.acme.certs.<name>.dnsPropagationCheck. As well as this, the options security.acme.acceptTerms and either or security.acme.certs.<name>.email must be set in order to use the ACME module. Certificates will be regenerated on activation, no account or certificate will be migrated from simp-le. In particular private keys will not be preserved. However, the credentials for simp-le are preserved and thus it is possible to roll back to previous versions without breaking certificate generation. Note also that in contrary to simp-le a new private key is recreated at each renewal by default, which can have consequences if you embed your public key in apps.

  • It is now possible to unlock LUKS-Encrypted file systems using a FIDO2 token via boot.initrd.luks.fido2Support.

  • Predictably named network interfaces get renamed in stage-1. This means that it is possible to use the proper interface name for e.g. Dropbear setups.

    For further reference, please read #68953 or the corresponding discourse thread.

  • The matrix-synapse-package has been updated to v1.11.1. Due to stricter requirements for database configuration when using postgresql, the automated database setup of the module has been removed to avoid any further edge-cases.

    matrix-synapse expects postgresql-databases to have the options LC_COLLATE and LC_CTYPE set to 'C' which basically instructs postgresql to ignore any locale-based preferences.

    Depending on your setup, you need to incorporate one of the following changes in your setup to upgrade to 20.03:

    • If you use sqlite3 you don't need to do anything.

    • If you use postgresql on a different server, you don't need to change anything as well since this module was never designed to configure remote databases.

    • If you use postgresql and configured your synapse initially on 19.09 or older, you simply need to enable postgresql-support explicitly:

      { ... }: {
        services.matrix-synapse = {
          enable = true;
          /* and all the other config you've defined here */
        services.postgresql.enable = true;

    • If you deploy a fresh matrix-synapse, you need to configure the database yourself (e.g. by using the services.postgresql.initialScript option). An example for this can be found in the documentation of the Matrix module.

    • If you initially deployed your matrix-synapse on nixos-unstable after the 19.09-release, your database is misconfigured due to a regression in NixOS. For now, matrix-synapse will startup with a warning, but it's recommended to reconfigure the database to set the values LC_COLLATE and LC_CTYPE to 'C'.

  • The option is now respected even when systemd-networkd is disabled. This mirrors the behaviour of systemd - It's udev that parses .link files, not systemd-networkd.

  • mongodb has been updated to version 3.4.24.

    Warning: Please note that mongodb has been relicensed under their own sspl-license. Since it's not entirely free and not OSI-approved, it's listed as non-free. This means that Hydra doesn't provide prebuilt mongodb-packages and needs to be built locally.

B.4. Release 19.09 (“Loris”, 2019/10/09)

B.4.1. Highlights

In addition to numerous new and upgraded packages, this release has the following highlights:

  • End of support is planned for end of April 2020, handing over to 20.03.

  • Nix has been updated to 2.3; see its release notes.

  • Core version changes:

    systemd: 239 -> 243

    gcc: 7 -> 8

    glibc: 2.27 (unchanged)

    linux: 4.19 LTS (unchanged)

    openssl: 1.0 -> 1.1

  • Desktop version changes:

    plasma5: 5.14 -> 5.16

    gnome3: 3.30 -> 3.32

  • PHP now defaults to PHP 7.3, updated from 7.2.

  • PHP 7.1 is no longer supported due to upstream not supporting this version for the entire lifecycle of the 19.09 release.

  • The binfmt module is now easier to use. Additional systems can be added through boot.binfmt.emulatedSystems. For instance, boot.binfmt.emulatedSystems = [ "wasm32-wasi" "x86_64-windows" "aarch64-linux" ]; will set up binfmt interpreters for each of those listed systems.

  • The installer now uses a less privileged nixos user whereas before we logged in as root. To gain root privileges use sudo -i without a password.

  • We've updated to Xfce 4.14, which brings a new module services.xserver.desktopManager.xfce4-14. If you'd like to upgrade, please switch from the services.xserver.desktopManager.xfce module as it will be deprecated in a future release. They're incompatibilities with the current Xfce module; it doesn't support thunarPlugins and it isn't recommended to use services.xserver.desktopManager.xfce and services.xserver.desktopManager.xfce4-14 simultaneously or to downgrade from Xfce 4.14 after upgrading.

  • The GNOME 3 desktop manager module sports an interface to enable/disable core services, applications, and optional GNOME packages like games.

    This can be achieved with the following options which the desktop manager default enables, excluding games.

    With these options we hope to give users finer grained control over their systems. Prior to this change you'd either have to manually disable options or use environment.gnome3.excludePackages which only excluded the optional applications. environment.gnome3.excludePackages is now unguarded, it can exclude any package installed with environment.systemPackages in the GNOME 3 module.

  • Orthogonal to the previous changes to the GNOME 3 desktop manager module, we've updated all default services and applications to match as close as possible to a default reference GNOME 3 experience.

    The following changes were enacted in services.gnome3.core-utilities.enable

    Applications removed from defaults:

    • accerciser

    • dconf-editor

    • evolution

    • gnome-documents

    • gnome-nettool

    • gnome-power-manager

    • gnome-todo

    • gnome-tweaks

    • gnome-usage

    • gucharmap

    • nautilus-sendto

    • vinagre

    Applications added to defaults:

    • cheese

    • geary

    The following changes were enacted in services.gnome3.core-shell.enable

    Applications added to defaults:

    • gnome-color-manager

    • orca

    Services enabled:

    • services.avahi.enable

B.4.2. New Services

The following new services were added since the last release:

  • ./programs/dwm-status.nix

  • The new hardware.printers module allows to declaratively configure CUPS printers via the ensurePrinters and ensureDefaultPrinter options. ensurePrinters will never delete existing printers, but will make sure that the given printers are configured as declared.

  • There is a new services.system-config-printer.enable and programs.system-config-printer.enable module for the program of the same name. If you previously had system-config-printer enabled through some other means you should migrate to using one of these modules.

    If you're a user of the following desktopManager modules no action is needed:

    • services.xserver.desktopManager.plasma5

    • services.xserver.desktopManager.gnome3

    • services.xserver.desktopManager.pantheon

    • services.xserver.desktopManager.mate

      Note Mate uses programs.system-config-printer as it doesn't use it as a service, but its graphical interface directly.

  • services.blueman.enable has been added. If you previously had blueman installed via environment.systemPackages please migrate to using the NixOS module, as this would result in an insufficiently configured blueman.

B.4.3. Backward Incompatibilities

When upgrading from a previous release, please be aware of the following incompatible changes:

  • Buildbot no longer supports Python 2, as support was dropped upstream in version 2.0.0. Configurations may need to be modified to make them compatible with Python 3.

  • PostgreSQL now uses /run/postgresql as its socket directory instead of /tmp. So if you run an application like eg. Nextcloud, where you need to use the Unix socket path as the database host name, you need to change it accordingly.

  • PostgreSQL 9.4 is scheduled EOL during the 19.09 life cycle and has been removed.

  • The options services.prometheus.alertmanager.user and have been removed because the alertmanager service is now using systemd's DynamicUser mechanism which obviates these options.

  • The NetworkManager systemd unit was renamed back from network-manager.service to NetworkManager.service for better compatibility with other applications expecting this name. The same applies to ModemManager where modem-manager.service is now called ModemManager.service again.

  • The services.nzbget.configFile and services.nzbget.openFirewall options were removed as they are managed internally by the nzbget. The services.nzbget.dataDir option hadn't actually been used by the module for some time and so was removed as cleanup.

  • The services.mysql.pidDir option was removed, as it was only used by the wordpress apache-httpd service to wait for mysql to have started up. This can be accomplished by either describing a dependency on mysql.service (preferred) or waiting for the (hardcoded) /run/mysqld/mysql.sock file to appear.

  • The services.emby.enable module has been removed, see services.jellyfin.enable instead for a free software fork of Emby. See the Jellyfin documentation: Migrating from Emby to Jellyfin

  • IPv6 Privacy Extensions are now enabled by default for undeclared interfaces. The previous behaviour was quite misleading — even though the default value for networking.interfaces.*.preferTempAddress was true, undeclared interfaces would not prefer temporary addresses. Now, interfaces not mentioned in the config will prefer temporary addresses. EUI64 addresses can still be set as preferred by explicitly setting the option to false for the interface in question.

  • Since Bittorrent Sync was superseded by Resilio Sync in 2016, the bittorrentSync, bittorrentSync14, and bittorrentSync16 packages have been removed in favor of resilio-sync.

    The corresponding module, services.btsync has been replaced by the services.resilio module.

  • The httpd service no longer attempts to start the postgresql service. If you have come to depend on this behaviour then you can preserve the behavior with the following configuration: = [ "postgresql.service" ];

    The option services.httpd.extraSubservices has been marked as deprecated. You may still use this feature, but it will be removed in a future release of NixOS. You are encouraged to convert any httpd subservices you may have written to a full NixOS module.

    Most of the httpd subservices packaged with NixOS have been replaced with full NixOS modules including LimeSurvey, WordPress, and Zabbix. These modules can be enabled using the services.limesurvey.enable, services.mediawiki.enable, services.wordpress.enable, and services.zabbixWeb.enable options.

  • The option<name>.routes.*.routeConfig.GatewayOnlink was renamed to<name>.routes.*.routeConfig.GatewayOnLink (capital L). This follows upstreams renaming of the setting.

  • As of this release the NixOps feature autoLuks is deprecated. It no longer works with our systemd version without manual intervention.

    Whenever the usage of the module is detected the evaluation will fail with a message explaining why and how to deal with the situation.

    A new knob named nixops.enableDeprecatedAutoLuks has been introduced to disable the eval failure and to acknowledge the notice was received and read. If you plan on using the feature please note that it might break with subsequent updates.

    Make sure you set the _netdev option for each of the file systems referring to block devices provided by the autoLuks module. Not doing this might render the system in a state where it doesn't boot anymore.

    If you are actively using the autoLuks module please let us know in issue #62211.

  • The setopt declarations will be evaluated at the end of /etc/zshrc, so any code in programs.zsh.interactiveShellInit, programs.zsh.loginShellInit and programs.zsh.promptInit may break if it relies on those options being set.

  • The prometheus-nginx-exporter package now uses the offical exporter provided by NGINX Inc. Its metrics are differently structured and are incompatible to the old ones. For information about the metrics, have a look at the official repo.

  • The shibboleth-sp package has been updated to version 3. It is largely backward compatible, for further information refer to the release notes and upgrade guide.

    Nodejs 8 is scheduled EOL under the lifetime of 19.09 and has been dropped.

  • By default, prometheus exporters are now run with DynamicUser enabled. Exporters that need a real user, now run under a seperate user and group which follow the pattern <exporter-name>-exporter, instead of the previous default nobody and nogroup. Only some exporters are affected by the latter, namely the exporters dovecot, node, postfix and varnish.

  • The ibus-qt package is not installed by default anymore when i18n.inputMethod.enabled is set to ibus. If IBus support in Qt 4.x applications is required, add the ibus-qt package to your environment.systemPackages manually.

  • The CUPS Printing service now uses socket-based activation by default, only starting when needed. The previous behavior can be restored by setting services.cups.startWhenNeeded to false.

  • The services.systemhealth module has been removed from nixpkgs due to lack of maintainer.

  • The services.mantisbt module has been removed from nixpkgs due to lack of maintainer.

  • Squid 3 has been removed and the squid derivation now refers to Squid 4.

  • The services.pdns-recursor.extraConfig option has been replaced by services.pdns-recursor.settings. The new option allows setting extra configuration while being better type-checked and mergeable.

  • No service depends on anymore which is a systemd target that indicates if all NixOps keys were successfully uploaded. Instead, <key-name>-key.service should be used to define a dependency of a key in a service. The full issue behind the dependency is described at NixOS/nixpkgs#67265.

    The following services are affected by this:

  • The option has been replaced by a read-only security.acme.certs.<cert>.directory option for each certificate you define. This will be a subdirectory of /var/lib/acme. You can use this read-only option to figure out where the certificates are stored for a specific certificate. For example, the services.nginx.virtualhosts.<name>.enableACME option will use this directory option to find the certs for the virtual host.

    security.acme.preDelay and security.acme.activationDelay options have been removed. To execute a service before certificates are provisioned or renewed add a RequiredBy=acme-${cert}.service to any service.

    Furthermore, the acme module will not automatically add a dependency on lighttpd.service anymore. If you are using certficates provided by letsencrypt for lighttpd, then you should depend on the certificate service acme-${cert}.service> manually.

    For nginx, the dependencies are still automatically managed when services.nginx.virtualhosts.<name>.enableACME is enabled just like before. What changed is that nginx now directly depends on the specific certificates that it needs, instead of depending on the catch-all This target unit was also removed from the codebase. This will mean nginx will no longer depend on certificates it isn't explicitly managing and fixes a bug with certificate renewal ordering racing with nginx restarting which could lead to nginx getting in a broken state as described at NixOS/nixpkgs#60180.

  • The old deprecated emacs package sets have been dropped. What used to be called emacsPackagesNg is now simply called emacsPackages.

  • services.xserver.desktopManager.xterm is now disabled by default if stateVersion is 19.09 or higher. Previously the xterm desktopManager was enabled when xserver was enabled, but it isn't useful for all people so it didn't make sense to have any desktopManager enabled default.

  • The WeeChat plugin pkgs.weechatScripts.weechat-xmpp has been removed as it doesn't receive any updates from upstream and depends on outdated Python2-based modules.

  • Old unsupported versions (logstash5, kibana5, filebeat5, heartbeat5, metricbeat5, packetbeat5) of the ELK-stack and Elastic beats have been removed.

  • For NixOS 19.03, both Prometheus 1 and 2 were available to allow for a seamless transition from version 1 to 2 with existing setups. Because Prometheus 1 is no longer developed, it was removed. Prometheus 2 is now configured with services.prometheus.

  • Citrix Receiver (citrix_receiver) has been dropped in favor of Citrix Workspace (citrix_workspace).

  • The services.gitlab module has had its literal secret options (services.gitlab.smtp.password, services.gitlab.databasePassword, services.gitlab.initialRootPassword, services.gitlab.secrets.secret, services.gitlab.secrets.db, services.gitlab.secrets.otp and services.gitlab.secrets.jws) replaced by file-based versions (services.gitlab.smtp.passwordFile, services.gitlab.databasePasswordFile, services.gitlab.initialRootPasswordFile, services.gitlab.secrets.secretFile, services.gitlab.secrets.dbFile, services.gitlab.secrets.otpFile and services.gitlab.secrets.jwsFile). This was done so that secrets aren't stored in the world-readable nix store, but means that for each option you'll have to create a file with the same exact string, add "File" to the end of the option name, and change the definition to a string pointing to the corresponding file; e.g. services.gitlab.databasePassword = "supersecurepassword" becomes services.gitlab.databasePasswordFile = "/path/to/secret_file" where the file secret_file contains the string supersecurepassword.

    The state path (services.gitlab.statePath) now has the following restriction: no parent directory can be owned by any other user than root or the user specified in services.gitlab.user; i.e. if services.gitlab.statePath is set to /var/lib/gitlab/state, gitlab and all parent directories must be owned by either root or the user specified in services.gitlab.user.

  • The networking.useDHCP option is unsupported in combination with networking.useNetworkd in anticipation of defaulting to it. It has to be set to false and enabled per interface with networking.interfaces.<name>.useDHCP = true;

  • The Twitter client corebird has been dropped as it is discontinued and does not work against the new Twitter API. Please use the fork cawbird instead which has been adapted to the API changes and is still maintained.

  • The nodejs-11_x package has been removed as it's EOLed by upstream.

  • Because of the systemd upgrade, systemd-timesyncd will no longer work if system.stateVersion is not set correctly. When upgrading from NixOS 19.03, please make sure that system.stateVersion is set to "19.03", or lower if the installation dates back to an earlier version of NixOS.

  • Due to the short lifetime of non-LTS kernel releases package attributes like linux_5_1, linux_5_2 and linux_5_3 have been removed to discourage dependence on specific non-LTS kernel versions in stable NixOS releases. Going forward, versioned attributes like linux_4_9 will exist for LTS versions only. Please use linux_latest or linux_testing if you depend on non-LTS releases. Keep in mind that linux_latest and linux_testing will change versions under the hood during the lifetime of a stable release and might include breaking changes.

  • Because of the systemd upgrade, some network interfaces might change their name. For details see upstream docs or our ticket.

B.4.4. Other Notable Changes

  • The documentation module gained an option named documentation.nixos.includeAllModules which makes the generated configuration.nix(5) manual page include all options from all NixOS modules included in a given configuration.nix configuration file. Currently, it is set to false by default as enabling it frequently prevents evaluation. But the plan is to eventually have it set to true by default. Please set it to true now in your configuration.nix and fix all the bugs it uncovers.

  • The vlc package gained support for Chromecast streaming, enabled by default. TCP port 8010 must be open for it to work, so something like networking.firewall.allowedTCPPorts = [ 8010 ]; may be required in your configuration. Also consider enabling Accelerated Video Playback for better transcoding performance.

  • The following changes apply if the stateVersion is changed to 19.09 or higher. For stateVersion = "19.03" or lower the old behavior is preserved.

    • solr.package defaults to pkgs.solr_8.

  • The dictionary now ships with fr_FR.{aff,dic} which is linked to fr-toutesvariantes.{aff,dic}.

  • The mysql service now runs as mysql user. Previously, systemd did execute it as root, and mysql dropped privileges itself. This includes ExecStartPre= and ExecStartPost= phases. To accomplish that, runtime and data directory setup was delegated to RuntimeDirectory and tmpfiles.

  • With the upgrade to systemd version 242 the systemd-timesyncd service is no longer using DynamicUser=yes. In order for the upgrade to work we rely on an activation script to move the state from the old to the new directory. The older directory (prior 19.09) was /var/lib/private/systemd/timesync.

    As long as the system.config.stateVersion is below 19.09 the state folder will migrated to its proper location (/var/lib/systemd/timesync), if required.

  • The package avahi is now built to look up service definitions from /etc/avahi/services instead of its output directory in the nix store. Accordingly the module avahi now supports custom service definitions via services.avahi.extraServiceFiles, which are then placed in the aforementioned directory. See avahi.service(5) for more information on custom service definitions.

  • Since version 0.1.19, cargo-vendor honors package includes that are specified in the Cargo.toml file of Rust crates. rustPlatform.buildRustPackage uses cargo-vendor to collect and build dependent crates. Since this change in cargo-vendor changes the set of vendored files for most Rust packages, the hash that use used to verify the dependencies, cargoSha256, also changes.

    The cargoSha256 hashes of all in-tree derivations that use buildRustPackage have been updated to reflect this change. However, third-party derivations that use buildRustPackage may have to be updated as well.

  • The consul package was upgraded past version 1.5, so its deprecated legacy UI is no longer available.

  • The default resample-method for PulseAudio has been changed from the upstream default speex-float-1 to speex-float-5. Be aware that low-powered ARM-based and MIPS-based boards will struggle with this so you'll need to set hardware.pulseaudio.daemon.config.resample-method back to speex-float-1.

  • The phabricator package and associated httpd.extraSubservice, as well as the phd service have been removed from nixpkgs due to lack of maintainer.

  • The mercurial httpd.extraSubservice has been removed from nixpkgs due to lack of maintainer.

  • The trac httpd.extraSubservice has been removed from nixpkgs because it was unmaintained.

  • The foswiki package and associated httpd.extraSubservice have been removed from nixpkgs due to lack of maintainer.

  • The tomcat-connector httpd.extraSubservice has been removed from nixpkgs.

  • It's now possible to change configuration in services.nextcloud after the initial deploy since all config parameters are persisted in an additional config file generated by the module. Previously core configuration like database parameters were set using their imperative installer after creating /var/lib/nextcloud.

  • There exists now lib.forEach, which is like map, but with arguments flipped. When mapping function body spans many lines (or has nested maps), it is often hard to follow which list is modified.

    Previous solution to this problem was either to use lib.flip map idiom or extract that anonymous mapping function to a named one. Both can still be used but lib.forEach is preferred over lib.flip map.

    The /etc/sysctl.d/nixos.conf file containing all the options set via boot.kernel.sysctl was moved to /etc/sysctl.d/60-nixos.conf, as sysctl.d(5) recommends prefixing all filenames in /etc/sysctl.d with a two-digit number and a dash to simplify the ordering of the files.

  • We now install the sysctl snippets shipped with systemd.

    This enables:

    • Loose reverse path filtering

    • Source route filtering

    • fq_codel as a packet scheduler (this helps to fight bufferbloat)

    This also configures the kernel to pass core dumps to systemd-coredump, and restricts the SysRq key combinations to the sync command only. These sysctl snippets can be found in /etc/sysctl.d/50-*.conf, and overridden via boot.kernel.sysctl (which will place the parameters in /etc/sysctl.d/60-nixos.conf).

  • Core dumps are now processed by systemd-coredump by default. systemd-coredump behaviour can still be modified via systemd.coredump.extraConfig. To stick to the old behaviour (having the kernel dump to a file called core in the working directory), without piping it through systemd-coredump, set systemd.coredump.enable to false.

  • systemd.packages option now also supports generators and shutdown scripts. Old systemd.generator-packages option has been removed.

  • The rmilter package was removed with associated module and options due deprecation by upstream developer. Use rspamd in proxy mode instead.

  • systemd cgroup accounting via the systemd.enableCgroupAccounting option is now enabled by default. It now also enables the more recent Block IO and IP accounting features.

  • We no longer enable custom font rendering settings with fonts.fontconfig.penultimate.enable by default. The defaults from fontconfig are sufficient.

  • The crashplan package and the crashplan service have been removed from nixpkgs due to crashplan shutting down the service, while the crashplansb package and crashplan-small-business service have been removed from nixpkgs due to lack of maintainer.

    The redis module was hardcoded to use the redis user, /run/redis as runtime directory and /var/lib/redis as state directory. Note that the NixOS module for Redis now disables kernel support for Transparent Huge Pages (THP), because this features causes major performance problems for Redis, e.g. (

  • Using fonts.enableDefaultFonts adds a default emoji font noto-fonts-emoji.

    Users of the following options will have this enabled by default:

    • services.xserver.enable

    • programs.sway.enable

    • programs.way-cooler.enable

    • services.xrdp.enable

  • The altcoins categorization of packages has been removed. You now access these packages at the top level, ie. nix-shell -p dogecoin instead of nix-shell -p altcoins.dogecoin, etc.

  • Ceph has been upgraded to v14.2.1. See the release notes for details. The mgr dashboard as well as osds backed by loop-devices is no longer explicitly supported by the package and module. Note: There's been some issues with python-cherrypy, which is used by the dashboard and prometheus mgr modules (and possibly others), hence 0000-dont-check-cherrypy-version.patch.

  • pkgs.weechat is now compiled against pkgs.python3. Weechat also recommends to use Python3 in their docs.

B.5. Release 19.03 (“Koi”, 2019/04/11)

B.5.1. Highlights

In addition to numerous new and upgraded packages, this release has the following highlights:

  • End of support is planned for end of October 2019, handing over to 19.09.

  • The default Python 3 interpreter is now CPython 3.7 instead of CPython 3.6.

  • Added the Pantheon desktop environment. It can be enabled through services.xserver.desktopManager.pantheon.enable.


    By default, services.xserver.desktopManager.pantheon enables LightDM as a display manager, as pantheon's screen locking implementation relies on it.

    Because of that it is recommended to leave LightDM enabled. If you'd like to disable it anyway, set services.xserver.displayManager.lightdm.enable to false and enable your preferred display manager.

    Also note that Pantheon's LightDM greeter is not enabled by default, because it has numerous issues in NixOS and isn't optimal for use here yet.

  • A major refactoring of the Kubernetes module has been completed. Refactorings primarily focus on decoupling components and enhancing security. Two-way TLS and RBAC has been enabled by default for all components, which slightly changes the way the module is configured. See: Chapter 41, Kubernetes for details.

  • There is now a set of confinement options for, which allows to restrict services into a chroot(2)ed environment that only contains the store paths from the runtime closure of the service.

B.5.2. New Services

The following new services were added since the last release:

  • ./programs/nm-applet.nix

  • There is a new security.googleOsLogin module for using OS Login to manage SSH access to Google Compute Engine instances, which supersedes the imperative and broken google-accounts-daemon used in nixos/modules/virtualisation/google-compute-config.nix.

  • ./services/misc/beanstalkd.nix

  • There is a new services.cockroachdb module for running CockroachDB databases. NixOS now ships with CockroachDB 2.1.x as well, available on x86_64-linux and aarch64-linux.

  • ./security/duosec.nix

  • The PAM module for Duo Security has been enabled for use. One can configure it using the security.duosec options along with the corresponding PAM option in<name?>.duoSecurity.enable.

B.5.3. Backward Incompatibilities

When upgrading from a previous release, please be aware of the following incompatible changes:

  • The minimum version of Nix required to evaluate Nixpkgs is now 2.0.

    • For users of NixOS 18.03 and 19.03, NixOS defaults to Nix 2.0, but supports using Nix 1.11 by setting nix.package = pkgs.nix1;. If this option is set to a Nix 1.11 package, you will need to either unset the option or upgrade it to Nix 2.0.

    • For users of NixOS 17.09, you will first need to upgrade Nix by setting nix.package = pkgs.nixStable2; and run nixos-rebuild switch as the root user.

    • For users of a daemon-less Nix installation on Linux or macOS, you can upgrade Nix by running curl -L | sh, or prior to doing a channel update, running nix-env -iA nix.

      If you have already run a channel update and Nix is no longer able to evaluate Nixpkgs, the error message printed should provide adequate directions for upgrading Nix.

    • For users of the Nix daemon on macOS, you can upgrade Nix by running sudo -i sh -c 'nix-channel --update && nix-env -iA nixpkgs.nix'; sudo launchctl stop org.nixos.nix-daemon; sudo launchctl start org.nixos.nix-daemon.

  • The buildPythonPackage function now sets strictDeps = true to help distinguish between native and non-native dependencies in order to improve cross-compilation compatibility. Note however that this may break user expressions.

  • The buildPythonPackage function now sets LANG = C.UTF-8 to enable Unicode support. The glibcLocales package is no longer needed as a build input.

  • The Syncthing state and configuration data has been moved from services.syncthing.dataDir to the newly defined services.syncthing.configDir, which default to /var/lib/syncthing/.config/syncthing. This change makes possible to share synced directories using ACLs without Syncthing resetting the permission on every start.

  • The ntp module now has sane default restrictions. If you're relying on the previous defaults, which permitted all queries and commands from all firewall-permitted sources, you can set services.ntp.restrictDefault and services.ntp.restrictSource to [].

  • Package rabbitmq_server is renamed to rabbitmq-server.

  • The light module no longer uses setuid binaries, but udev rules. As a consequence users of that module have to belong to the video group in order to use the executable (i.e. users.users.yourusername.extraGroups = ["video"];).

  • Buildbot now supports Python 3 and its packages have been moved to pythonPackages. The options services.buildbot-master.package and services.buildbot-worker.package can be used to select the Python 2 or 3 version of the package.

  • Options and were removed. They were never used for anything and can therefore safely be removed.

  • Package wasm has been renamed proglodyte-wasm. The package wasm will be pointed to ocamlPackages.wasm in 19.09, so make sure to update your configuration if you want to keep proglodyte-wasm

  • When the nixpkgs.pkgs option is set, NixOS will no longer ignore the nixpkgs.overlays option. The old behavior can be recovered by setting nixpkgs.overlays = lib.mkForce [];.

  • OpenSMTPD has been upgraded to version 6.4.0p1. This release makes backwards-incompatible changes to the configuration file format. See man smtpd.conf for more information on the new file format.

  • The versioned postgresql have been renamed to use underscore number seperators. For example, postgresql96 has been renamed to postgresql_9_6.

  • Package consul-ui and passthrough consul.ui have been removed. The package consul now uses upstream releases that vendor the UI into the binary. See #48714 for details.

  • Slurm introduces the new option services.slurm.stateSaveLocation, which is now set to /var/spool/slurm by default (instead of /var/spool). Make sure to move all files to the new directory or to set the option accordingly.

    The slurmctld now runs as user slurm instead of root. If you want to keep slurmctld running as root, set services.slurm.user = root.

    The options services.slurm.nodeName and services.slurm.partitionName are now sets of strings to correctly reflect that fact that each of these options can occour more than once in the configuration.

  • The solr package has been upgraded from 4.10.3 to 7.5.0 and has undergone some major changes. The services.solr module has been updated to reflect these changes. Please review carefully before upgrading.

  • Package ckb is renamed to ckb-next, and options hardware.ckb.* are renamed to hardware.ckb-next.*.

  • The option services.xserver.displayManager.job.logToFile which was previously set to true when using the display managers lightdm, sddm or xpra has been reset to the default value (false).

  • Network interface indiscriminate NixOS firewall options (networking.firewall.allow*) are now preserved when also setting interface specific rules such as networking.firewall.interfaces.en0.allow*. These rules continue to use the pseudo device "default" (networking.firewall.interfaces.default.*), and assigning to this pseudo device will override the (networking.firewall.allow*) options.

  • The nscd service now disables all caching of passwd and group databases by default. This was interferring with the correct functioning of the module which is used by systemd to manage uids and usernames in the presence of DynamicUser= in systemd services. This was already the default behaviour in presence of services.sssd.enable = true because nscd caching would interfere with sssd in unpredictable ways as well. Because we're using nscd not for caching, but for convincing glibc to find NSS modules in the nix store instead of an absolute path, we have decided to disable caching globally now, as it's usually not the behaviour the user wants and can lead to surprising behaviour. Furthermore, negative caching of host lookups is also disabled now by default. This should fix the issue of dns lookups failing in the presence of an unreliable network.

    If the old behaviour is desired, this can be restored by setting the services.nscd.config option with the desired caching parameters.

         services.nscd.config =
         server-user             nscd
         threads                 1
         paranoia                no
         debug-level             0
         enable-cache            passwd          yes
         positive-time-to-live   passwd          600
         negative-time-to-live   passwd          20
         suggested-size          passwd          211
         check-files             passwd          yes
         persistent              passwd          no
         shared                  passwd          yes
         enable-cache            group           yes
         positive-time-to-live   group           3600
         negative-time-to-live   group           60
         suggested-size          group           211
         check-files             group           yes
         persistent              group           no
         shared                  group           yes
         enable-cache            hosts           yes
         positive-time-to-live   hosts           600
         negative-time-to-live   hosts           5
         suggested-size          hosts           211
         check-files             hosts           yes
         persistent              hosts           no
         shared                  hosts           yes

    See #50316 for details.

  • GitLab Shell previously used the nix store paths for the gitlab-shell command in its authorized_keys file, which might stop working after garbage collection. To circumvent that, we regenerated that file on each startup. As gitlab-shell has now been changed to use /var/run/current-system/sw/bin/gitlab-shell, this is not necessary anymore, but there might be leftover lines with a nix store path. Regenerate the authorized_keys file via sudo -u git -H gitlab-rake gitlab:shell:setup in that case.

  • The pam_unix account module is now loaded with its control field set to required instead of sufficient, so that later PAM account modules that might do more extensive checks are being executed. Previously, the whole account module verification was exited prematurely in case a nss module provided the account name to pam_unix. The LDAP and SSSD NixOS modules already add their NSS modules when enabled. In case your setup breaks due to some later PAM account module previosuly shadowed, or failing NSS lookups, please file a bug. You can get back the old behaviour by manually setting<name?>.text .

  • The pam_unix password module is now loaded with its control field set to sufficient instead of required, so that password managed only by later PAM password modules are being executed. Previously, for example, changing an LDAP account's password through PAM was not possible: the whole password module verification was exited prematurely by pam_unix, preventing pam_ldap to manage the password as it should.

  • fish has been upgraded to 3.0. It comes with a number of improvements and backwards incompatible changes. See the fish release notes for more information.

  • The ibus-table input method has had a change in config format, which causes all previous settings to be lost. See this commit message for details.

  • NixOS module system type types.optionSet and lib.mkOption argument options are deprecated. Use types.submodule instead. (#54637)

  • matrix-synapse has been updated to version 0.99. It will no longer generate a self-signed certificate on first launch and will be the last version to accept self-signed certificates. As such, it is now recommended to use a proper certificate verified by a root CA (for example Let's Encrypt). The new manual chapter on Matrix contains a working example of using nginx as a reverse proxy in front of matrix-synapse, using Let's Encrypt certificates.

  • mailutils now works by default when sendmail is not in a setuid wrapper. As a consequence, the sendmailPath argument, having lost its main use, has been removed.

  • graylog has been upgraded from version 2.* to 3.*. Some setups making use of extraConfig (especially those exposing Graylog via reverse proxies) need to be updated as upstream removed/replaced some settings. See Upgrading Graylog for details.

  • The option users.ldap.bind.password was renamed to users.ldap.bind.passwordFile, and needs to be readable by the nslcd user. Same applies to the new users.ldap.daemon.rootpwmodpwFile option.

  • nodejs-6_x is end-of-life. nodejs-6_x, nodejs-slim-6_x and nodePackages_6_x are removed.

B.5.4. Other Notable Changes

  • The services.matomo module gained the option services.matomo.package which determines the used Matomo version.

    The Matomo module now also comes with the systemd service matomo-archive-processing.service and a timer that automatically triggers archive processing every hour. This means that you can safely disable browser triggers for Matomo archiving at Administration > System > General Settings.

    Additionally, you can enable to delete old visitor logs at Administration > System > Privacy, but make sure that you run systemctl start matomo-archive-processing.service at least once without errors if you have already collected data before, so that the reports get archived before the source data gets deleted.

  • composableDerivation along with supporting library functions has been removed.

  • The deprecated truecrypt package has been removed and truecrypt attribute is now an alias for veracrypt. VeraCrypt is backward-compatible with TrueCrypt volumes. Note that cryptsetup also supports loading TrueCrypt volumes.

  • The Kubernetes DNS addons, kube-dns, has been replaced with CoreDNS. This change is made in accordance with Kubernetes making CoreDNS the official default starting from Kubernetes v1.11. Please beware that upgrading DNS-addon on existing clusters might induce minor downtime while the DNS-addon terminates and re-initializes. Also note that the DNS-service now runs with 2 pod replicas by default. The desired number of replicas can be configured using: services.kubernetes.addons.dns.replicas.

  • The quassel-webserver package and module was removed from nixpkgs due to the lack of maintainers.

  • The manual gained a new chapter on self-hosting matrix-synapse and riot-web , the most prevalent server and client implementations for the Matrix federated communication network.

  • The astah-community package was removed from nixpkgs due to it being discontinued and the downloads not being available anymore.

  • The httpd service now saves log files with a .log file extension by default for easier integration with the logrotate service.

  • The owncloud server packages and httpd subservice module were removed from nixpkgs due to the lack of maintainers.

  • It is possible now to uze ZRAM devices as general purpose ephemeral block devices, not only as swap. Using more than 1 device as ZRAM swap is no longer recommended, but is still possible by setting zramSwap.swapDevices explicitly.

    ZRAM algorithm can be changed now.

    Changes to ZRAM algorithm are applied during nixos-rebuild switch, so make sure you have enough swap space on disk to survive ZRAM device rebuild. Alternatively, use nixos-rebuild boot; reboot.

  • Flat volumes are now disabled by default in hardware.pulseaudio. This has been done to prevent applications, which are unaware of this feature, setting their volumes to 100% on startup causing harm to your audio hardware and potentially your ears.

    Note: With this change application specific volumes are relative to the master volume which can be adjusted independently, whereas before they were absolute; meaning that in effect, it scaled the device-volume with the volume of the loudest application.
  • The ndppd module now supports all config options provided by the current upstream version as service options. Additionally the ndppd package doesn't contain the systemd unit configuration from upstream anymore, the unit is completely configured by the NixOS module now.

  • New installs of NixOS will default to the Redmine 4.x series unless otherwise specified in services.redmine.package while existing installs of NixOS will default to the Redmine 3.x series.

  • The Grafana module now supports declarative datasource and dashboard provisioning.

  • The use of insecure ports on kubernetes has been deprecated. Thus options: services.kubernetes.apiserver.port and services.kubernetes.controllerManager.port has been renamed to .insecurePort, and default of both options has changed to 0 (disabled).

  • Note that the default value of services.kubernetes.apiserver.bindAddress has changed from to, allowing the apiserver to be accessible from outside the master node itself. If the apiserver insecurePort is enabled, it is strongly recommended to only bind on the loopback interface. See: services.kubernetes.apiserver.insecurebindAddress.

  • The option services.kubernetes.apiserver.allowPrivileged and services.kubernetes.kubelet.allowPrivileged now defaults to false. Disallowing privileged containers on the cluster.

  • The kubernetes module does no longer add the kubernetes package to environment.systemPackages implicitly.

  • The intel driver has been removed from the default list of video drivers. The modesetting driver should take over automatically, it is better maintained upstream and has less problems with advanced X11 features. This can lead to a change in the output names used by xrandr. Some performance regressions on some GPU models might happen. Some OpenCL and VA-API applications might also break (Beignet seems to provide OpenCL support with modesetting driver, too). Kernel mode setting API does not support backlight control, so xbacklight tool will not work; backlight level can be controlled directly via /sys/ or with brightnessctl. Users who need this functionality more than multi-output XRandR are advised to add `intel` to `videoDrivers` and report an issue (or provide additional details in an existing one)

  • Openmpi has been updated to version 4.0.0, which removes some deprecated MPI-1 symbols. This may break some older applications that still rely on those symbols. An upgrade guide can be found here.

    The nginx package now relies on OpenSSL 1.1 and supports TLS 1.3 by default. You can set the protocols used by the nginx service using services.nginx.sslProtocols.

  • A new subcommand nixos-rebuild edit was added.

B.6. Release 18.09 (“Jellyfish”, 2018/10/05)

B.6.1. Highlights

In addition to numerous new and upgraded packages, this release has the following notable updates:

  • End of support is planned for end of April 2019, handing over to 19.03.

  • Platform support: x86_64-linux and x86_64-darwin as always. Support for aarch64-linux is as with the previous releases, not equivalent to the x86-64-linux release, but with efforts to reach parity.

  • Nix has been updated to 2.1; see its release notes.

  • Core versions: linux: 4.14 LTS (unchanged), glibc: 2.26 → 2.27, gcc: 7 (unchanged), systemd: 237 → 239.

  • Desktop version changes: gnome: 3.26 → 3.28, (KDE) plasma-desktop: 5.12 → 5.13.

Notable changes and additions for 18.09 include:

  • Support for wrapping binaries using firejail has been added through programs.firejail.wrappedBinaries.

    For example

    programs.firejail = {
      enable = true;
      wrappedBinaries = {
        firefox = "${lib.getBin pkgs.firefox}/bin/firefox";
        mpv = "${lib.getBin pkgs.mpv}/bin/mpv";

    This will place firefox and mpv binaries in the global path wrapped by firejail.

  • User channels are now in the default NIX_PATH, allowing users to use their personal nix-channel defined channels in nix-build and nix-shell commands, as well as in imports like import <mychannel>.

    For example

    $ nix-channel --add nixpkgsunstable
    $ nix-channel --update
    $ nix-build '<nixpkgsunstable>' -A gitFull
    $ nix run -f '<nixpkgsunstable>' gitFull
    $ nix-instantiate -E '(import <nixpkgsunstable> {}).gitFull'

B.6.2. New Services

A curated selection of new services that were added since the last release:

  • The services.cassandra module has been reworked and was rewritten from scratch. The service has succeeding tests for the versions 2.1, 2.2, 3.0 and 3.11 of Apache Cassandra.

  • There is a new services.foundationdb module for deploying FoundationDB clusters.

  • When enabled the iproute2 will copy the files expected by ip route (e.g., rt_tables) in /etc/iproute2. This allows to write aliases for routing tables for instance.

  • services.strongswan-swanctl is a modern replacement for services.strongswan. You can use either one of them to setup IPsec VPNs but not both at the same time.

    services.strongswan-swanctl uses the swanctl command which uses the modern vici Versatile IKE Configuration Interface. The deprecated ipsec command used in services.strongswan is using the legacy stroke configuration interface.

  • The new services.elasticsearch-curator service periodically curates or manages, your Elasticsearch indices and snapshots.

Every new services:

  • ./config/xdg/autostart.nix

  • ./config/xdg/icons.nix

  • ./config/xdg/menus.nix

  • ./config/xdg/mime.nix

  • ./hardware/brightnessctl.nix

  • ./hardware/onlykey.nix

  • ./hardware/video/uvcvideo/default.nix

  • ./misc/documentation.nix

  • ./programs/firejail.nix

  • ./programs/iftop.nix

  • ./programs/sedutil.nix

  • ./programs/singularity.nix

  • ./programs/xss-lock.nix

  • ./programs/zsh/zsh-autosuggestions.nix

  • ./services/admin/oxidized.nix

  • ./services/backup/duplicati.nix

  • ./services/backup/restic.nix

  • ./services/backup/restic-rest-server.nix

  • ./services/cluster/hadoop/default.nix

  • ./services/databases/aerospike.nix

  • ./services/databases/monetdb.nix

  • ./services/desktops/bamf.nix

  • ./services/desktops/flatpak.nix

  • ./services/desktops/zeitgeist.nix

  • ./services/development/bloop.nix

  • ./services/development/jupyter/default.nix

  • ./services/hardware/lcd.nix

  • ./services/hardware/undervolt.nix

  • ./services/misc/clipmenu.nix

  • ./services/misc/gitweb.nix

  • ./services/misc/serviio.nix

  • ./services/misc/safeeyes.nix

  • ./services/misc/sysprof.nix

  • ./services/misc/weechat.nix

  • ./services/monitoring/datadog-agent.nix

  • ./services/monitoring/incron.nix

  • ./services/networking/dnsdist.nix

  • ./services/networking/freeradius.nix

  • ./services/networking/hans.nix

  • ./services/networking/morty.nix

  • ./services/networking/ndppd.nix

  • ./services/networking/ocserv.nix

  • ./services/networking/owamp.nix

  • ./services/networking/quagga.nix

  • ./services/networking/shadowsocks.nix

  • ./services/networking/stubby.nix

  • ./services/networking/zeronet.nix

  • ./services/security/certmgr.nix

  • ./services/security/cfssl.nix

  • ./services/security/oauth2_proxy_nginx.nix

  • ./services/web-apps/virtlyst.nix

  • ./services/web-apps/youtrack.nix

  • ./services/web-servers/hitch/default.nix

  • ./services/web-servers/hydron.nix

  • ./services/web-servers/meguca.nix

  • ./services/web-servers/nginx/gitweb.nix

  • ./virtualisation/kvmgt.nix

  • ./virtualisation/qemu-guest-agent.nix

B.6.3. Backward Incompatibilities

When upgrading from a previous release, please be aware of the following incompatible changes:

  • Some licenses that were incorrectly not marked as unfree now are. This is the case for:

    • cc-by-nc-sa-20: Creative Commons Attribution Non Commercial Share Alike 2.0

    • cc-by-nc-sa-25: Creative Commons Attribution Non Commercial Share Alike 2.5

    • cc-by-nc-sa-30: Creative Commons Attribution Non Commercial Share Alike 3.0

    • cc-by-nc-sa-40: Creative Commons Attribution Non Commercial Share Alike 4.0

    • cc-by-nd-30: Creative Commons Attribution-No Derivative Works v3.00

    • msrla: Microsoft Research License Agreement

  • The deprecated services.cassandra module has seen a complete rewrite. (See above.)

  • lib.strict is removed. Use builtins.seq instead.

  • The clementine package points now to the free derivation. clementineFree is removed now and clementineUnfree points to the package which is bundled with the unfree libspotify package.

  • The netcat package is now taken directly from OpenBSD's libressl, instead of relying on Debian's fork. The new version should be very close to the old version, but there are some minor differences. Importantly, flags like -b, -q, -C, and -Z are no longer accepted by the nc command.

  • The services.docker-registry.extraConfig object doesn't contain environment variables anymore. Instead it needs to provide an object structure that can be mapped onto the YAML configuration defined in the docker/distribution docs.

  • gnucash has changed from version 2.4 to 3.x. If you've been using gnucash (version 2.4) instead of gnucash26 (version 2.6) you must open your Gnucash data file(s) with gnucash26 and then save them to upgrade the file format. Then you may use your data file(s) with Gnucash 3.x. See the upgrade documentation. Gnucash 2.4 is still available under the attribute gnucash24.

  • services.munge now runs as user (and group) munge instead of root. Make sure the key file is accessible to the daemon.

  • dockerTools.buildImage now uses null as default value for tag, which indicates that the nix output hash will be used as tag.

  • The ELK stack: elasticsearch, logstash and kibana has been upgraded from 2.* to 6.3.*. The 2.* versions have been unsupported since last year so they have been removed. You can still use the 5.* versions under the names elasticsearch5, logstash5 and kibana5.

    The elastic beats: filebeat, heartbeat, metricbeat and packetbeat have had the same treatment: they now target 6.3.* as well. The 5.* versions are available under the names: filebeat5, heartbeat5, metricbeat5 and packetbeat5

    The ELK-6.3 stack now comes with X-Pack by default. Since X-Pack is licensed under the Elastic License the ELK packages now have an unfree license. To use them you need to specify allowUnfree = true; in your nixpkgs configuration.

    Fortunately there is also a free variant of the ELK stack without X-Pack. The packages are available under the names: elasticsearch-oss, logstash-oss and kibana-oss.

  • Options were removed. luksroot.nix module never supported more than one YubiKey at a time anyway, hence those options never had any effect. You should be able to remove them from your config without any issues.

  • stdenv.system and system in nixpkgs now refer to the host platform instead of the build platform. For native builds this is not change, let alone a breaking one. For cross builds, it is a breaking change, and stdenv.buildPlatform.system can be used instead for the old behavior. They should be using that anyways for clarity.

  • Groups kvm and render are introduced now, as systemd requires them.

B.6.4. Other Notable Changes

  • dockerTools.pullImage relies on image digest instead of image tag to download the image. The sha256 of a pulled image has to be updated.

  • lib.attrNamesToStr has been deprecated. Use more specific concatenation (lib.concat(Map)StringsSep) instead.

  • lib.addErrorContextToAttrs has been deprecated. Use builtins.addErrorContext directly.

  • lib.showVal has been deprecated. Use lib.traceSeqN instead.

  • lib.traceXMLVal has been deprecated. Use lib.traceValFn builtins.toXml instead.

  • lib.traceXMLValMarked has been deprecated. Use lib.traceValFn (x: str + builtins.toXML x) instead.

  • The pkgs argument to NixOS modules can now be set directly using nixpkgs.pkgs. Previously, only the system, config and overlays arguments could be used to influence pkgs.

  • A NixOS system can now be constructed more easily based on a preexisting invocation of Nixpkgs. For example:

    inherit (pkgs.nixos {
      boot.loader.grub.enable = false;
      fileSystems."/".device = "/dev/xvda1";
    }) toplevel kernel initialRamdisk manual;

    This benefits evaluation performance, lets you write Nixpkgs packages that depend on NixOS images and is consistent with a deployment architecture that would be centered around Nixpkgs overlays.

  • lib.traceValIfNot has been deprecated. Use if/then/else and lib.traceValSeq instead.

  • lib.traceCallXml has been deprecated. Please complain if you use the function regularly.

  • The attribute lib.nixpkgsVersion has been deprecated in favor of lib.version. Please refer to the discussion in NixOS/nixpkgs#39416 for further reference.

  • lib.recursiveUpdateUntil was not acting according to its specification. It has been fixed to act according to the docstring, and a test has been added.

  • The module for security.dhparams has two new options now:


    Puts the generated Diffie-Hellman parameters into the Nix store instead of managing them in a stateful manner in /var/lib/dhparams.


    The default bit size to use for the generated Diffie-Hellman parameters.

    Note: The path to the actual generated parameter files should now be queried using because it might be either in the Nix store or in a directory configured by security.dhparams.path.

    For developers:

    Module implementers should not set a specific bit size in order to let users configure it by themselves if they want to have a different bit size than the default (2048).

    An example usage of this would be:

    { config, ... }:
      security.dhparams.params.myservice = {};
      environment.etc."myservice.conf".text = ''
        dhparams = ${}

  • networking.networkmanager.useDnsmasq has been deprecated. Use networking.networkmanager.dns instead.

  • The Kubernetes package has been bumped to major version 1.11. Please consult the release notes for details on new features and api changes.

  • The option services.kubernetes.apiserver.admissionControl was renamed to services.kubernetes.apiserver.enableAdmissionPlugins.

  • Recommended way to access the Kubernetes Dashboard is via HTTPS (TLS) Therefore; public service port for the dashboard has changed to 443 (container port 8443) and scheme to https.

  • The option services.kubernetes.apiserver.address was renamed to services.kubernetes.apiserver.bindAddress. Note that the default value has changed from to

  • The option services.kubernetes.apiserver.publicAddress was not used and thus has been removed.

  • The option services.kubernetes.addons.dashboard.enableRBAC was renamed to services.kubernetes.addons.dashboard.rbac.enable.

  • The Kubernetes Dashboard now has only minimal RBAC permissions by default. If dashboard cluster-admin rights are desired, set services.kubernetes.addons.dashboard.rbac.clusterAdmin to true. On existing clusters, in order for the revocation of privileges to take effect, the current ClusterRoleBinding for kubernetes-dashboard must be manually removed: kubectl delete clusterrolebinding kubernetes-dashboard

  • The programs.screen module provides allows to configure /etc/screenrc, however the module behaved fairly counterintuitive as the config exists, but the package wasn't available. Since 18.09 pkgs.screen will be added to environment.systemPackages.

  • The module services.networking.hostapd now uses WPA2 by default.

  • s6Dns, s6Networking, s6LinuxUtils and s6PortableUtils renamed to s6-dns, s6-networking, s6-linux-utils and s6-portable-utils respectively.

  • The module option nix.useSandbox is now defaulted to true.

  • The config activation script of nixos-rebuild now reloads all user units for each authenticated user.

  • The default display manager is now LightDM. To use SLiM set services.xserver.displayManager.slim.enable to true.

  • NixOS option descriptions are now automatically broken up into individual paragraphs if the text contains two consecutive newlines, so it's no longer necessary to use </para><para> to start a new paragraph.

  • Top-level buildPlatform, hostPlatform, and targetPlatform in Nixpkgs are deprecated. Please use their equivalents in stdenv instead: stdenv.buildPlatform, stdenv.hostPlatform, and stdenv.targetPlatform.

B.7. Release 18.03 (“Impala”, 2018/04/04)

B.7.1. Highlights

In addition to numerous new and upgraded packages, this release has the following highlights:

  • End of support is planned for end of October 2018, handing over to 18.09.

  • Platform support: x86_64-linux and x86_64-darwin since release time (the latter isn't NixOS, really). Binaries for aarch64-linux are available, but no channel exists yet, as it's waiting for some test fixes, etc.

  • Nix now defaults to 2.0; see its release notes.

  • Core version changes: linux: 4.9 -> 4.14, glibc: 2.25 -> 2.26, gcc: 6 -> 7, systemd: 234 -> 237.

  • Desktop version changes: gnome: 3.24 -> 3.26, (KDE) plasma-desktop: 5.10 -> 5.12.

  • MariaDB 10.2, updated from 10.1, is now the default MySQL implementation. While upgrading a few changes have been made to the infrastructure involved:

    • libmysql has been deprecated, please use mysql.connector-c instead, a compatibility passthru has been added to the MySQL packages.

    • The mysql57 package has a new static output containing the static libraries including libmysqld.a

  • PHP now defaults to PHP 7.2, updated from 7.1.

B.7.2. New Services

The following new services were added since the last release:

  • ./config/krb5/default.nix

  • ./hardware/digitalbitbox.nix

  • ./misc/label.nix

  • ./programs/ccache.nix

  • ./programs/criu.nix

  • ./programs/digitalbitbox/default.nix

  • ./programs/less.nix

  • ./programs/npm.nix

  • ./programs/plotinus.nix

  • ./programs/rootston.nix

  • ./programs/systemtap.nix

  • ./programs/sway.nix

  • ./programs/udevil.nix

  • ./programs/way-cooler.nix

  • ./programs/yabar.nix

  • ./programs/zsh/zsh-autoenv.nix

  • ./services/backup/borgbackup.nix

  • ./services/backup/crashplan-small-business.nix

  • ./services/desktops/dleyna-renderer.nix

  • ./services/desktops/dleyna-server.nix

  • ./services/desktops/pipewire.nix

  • ./services/desktops/gnome3/chrome-gnome-shell.nix

  • ./services/desktops/gnome3/tracker-miners.nix

  • ./services/hardware/fwupd.nix

  • ./services/hardware/interception-tools.nix

  • ./services/hardware/u2f.nix

  • ./services/hardware/usbmuxd.nix

  • ./services/mail/clamsmtp.nix

  • ./services/mail/dkimproxy-out.nix

  • ./services/mail/pfix-srsd.nix

  • ./services/misc/gitea.nix

  • ./services/misc/home-assistant.nix

  • ./services/misc/ihaskell.nix

  • ./services/misc/logkeys.nix

  • ./services/misc/novacomd.nix

  • ./services/misc/osrm.nix

  • ./services/misc/plexpy.nix

  • ./services/misc/pykms.nix

  • ./services/misc/tzupdate.nix

  • ./services/monitoring/fusion-inventory.nix

  • ./services/monitoring/prometheus/exporters.nix

  • ./services/network-filesystems/beegfs.nix

  • ./services/network-filesystems/davfs2.nix

  • ./services/network-filesystems/openafs/client.nix

  • ./services/network-filesystems/openafs/server.nix

  • ./services/network-filesystems/ceph.nix

  • ./services/networking/aria2.nix

  • ./services/networking/monero.nix

  • ./services/networking/nghttpx/default.nix

  • ./services/networking/nixops-dns.nix

  • ./services/networking/rxe.nix

  • ./services/networking/stunnel.nix

  • ./services/web-apps/matomo.nix

  • ./services/web-apps/restya-board.nix

  • ./services/web-servers/mighttpd2.nix

  • ./services/x11/fractalart.nix

  • ./system/boot/binfmt.nix

  • ./system/boot/grow-partition.nix

  • ./tasks/filesystems/ecryptfs.nix

  • ./virtualisation/hyperv-guest.nix

B.7.3. Backward Incompatibilities

When upgrading from a previous release, please be aware of the following incompatible changes:

  • sound.enable now defaults to false.

  • Dollar signs in options under services.postfix are passed verbatim to Postfix, which will interpret them as the beginning of a parameter expression. This was already true for string-valued options in the previous release, but not for list-valued options. If you need to pass literal dollar signs through Postfix, double them.

  • The postage package (for web-based PostgreSQL administration) has been renamed to pgmanage. The corresponding module has also been renamed. To migrate please rename all services.postage options to services.pgmanage.

  • Package attributes starting with a digit have been prefixed with an underscore sign. This is to avoid quoting in the configuration and other issues with command-line tools like nix-env. The change affects the following packages:

    • 2048-in-terminal_2048-in-terminal

    • 90secondportraits_90secondportraits

    • 2bwm_2bwm

    • 389-ds-base_389-ds-base

  • The OpenSSH service no longer enables support for DSA keys by default, which could cause a system lock out. Update your keys or, unfavorably, re-enable DSA support manually.

    DSA support was deprecated in OpenSSH 7.0, due to it being too weak. To re-enable support, add PubkeyAcceptedKeyTypes +ssh-dss to the end of your services.openssh.extraConfig.

    After updating the keys to be stronger, anyone still on a pre-17.03 version is safe to jump to 17.03, as vetted here.

  • The openssh package now includes Kerberos support by default; the openssh_with_kerberos package is now a deprecated alias. If you do not want Kerberos support, you can do openssh.override { withKerberos = false; }. Note, this also applies to the openssh_hpn package.

  • cc-wrapper has been split in two; there is now also a bintools-wrapper. The most commonly used files in nix-support are now split between the two wrappers. Some commonly used ones, like nix-support/dynamic-linker, are duplicated for backwards compatability, even though they rightly belong only in bintools-wrapper. Other more obscure ones are just moved.

  • The propagation logic has been changed. The new logic, along with new types of dependencies that go with, is thoroughly documented in the "Specifying dependencies" section of the "Standard Environment" chapter of the nixpkgs manual. The old logic isn't but is easy to describe: dependencies were propagated as the same type of dependency no matter what. In practice, that means that many propagatedNativeBuildInputs should instead be propagatedBuildInputs. Thankfully, that was and is the least used type of dependency. Also, it means that some propagatedBuildInputs should instead be depsTargetTargetPropagated. Other types dependencies should be unaffected.

  • lib.addPassthru drv passthru is removed. Use lib.extendDerivation true passthru drv instead.

  • The memcached service no longer accept dynamic socket paths via services.memcached.socket. Unix sockets can be still enabled by services.memcached.enableUnixSocket and will be accessible at /run/memcached/memcached.sock.

  • The hardware.amdHybridGraphics.disable option was removed for lack of a maintainer. If you still need this module, you may wish to include a copy of it from an older version of nixos in your imports.

  • The merging of config options for services.postfix.config was buggy. Previously, if other options in the Postfix module like services.postfix.useSrs were set and the user set config options that were also set by such options, the resulting config wouldn't include all options that were needed. They are now merged correctly. If config options need to be overridden, lib.mkForce or lib.mkOverride can be used.

  • The following changes apply if the stateVersion is changed to 18.03 or higher. For stateVersion = "17.09" or lower the old behavior is preserved.

    • matrix-synapse uses postgresql by default instead of sqlite. Migration instructions can be found here .

  • The jid package has been removed, due to maintenance overhead of a go package having non-versioned dependencies.

  • When using services.xserver.libinput (enabled by default in GNOME), it now handles all input devices, not just touchpads. As a result, you might need to re-evaluate any custom Xorg configuration. In particular, Option "XkbRules" "base" may result in broken keyboard layout.

  • The attic package was removed. A maintained fork called Borg should be used instead. Migration instructions can be found here.

  • The Piwik analytics software was renamed to Matomo:

    • The package pkgs.piwik was renamed to pkgs.matomo.

    • The service services.piwik was renamed to services.matomo.

    • The data directory /var/lib/piwik was renamed to /var/lib/matomo. All files will be moved automatically on first startup, but you might need to adjust your backup scripts.

    • The default serverName for the nginx configuration changed from piwik.${config.networking.hostName} to matomo.${config.networking.hostName}.${config.networking.domain} if config.networking.domain is set, matomo.${config.networking.hostName} if it is not set. If you change your serverName, remember you'll need to update the trustedHosts[] array in /var/lib/matomo/config/config.ini.php as well.

    • The piwik user was renamed to matomo. The service will adjust ownership automatically for files in the data directory. If you use unix socket authentication, remember to give the new matomo user access to the database and to change the username to matomo in the [database] section of /var/lib/matomo/config/config.ini.php.

    • If you named your database `piwik`, you might want to rename it to `matomo` to keep things clean, but this is neither enforced nor required.

  • nodejs-4_x is end-of-life. nodejs-4_x, nodejs-slim-4_x and nodePackages_4_x are removed.

  • The NixOS module was removed. It is now maintained as an external module.

  • The Prosody XMPP server has received a major update. The following modules were renamed:

    • services.prosody.modules.httpserver is now services.prosody.modules.http_files

    • services.prosody.modules.console is now services.prosody.modules.admin_telnet

    Many new modules are now core modules, most notably services.prosody.modules.carbons and services.prosody.modules.mam.

    The better-performing libevent backend is now enabled by default.

    withCommunityModules now passes through the modules to services.prosody.extraModules. Use withOnlyInstalledCommunityModules for modules that should not be enabled directly, e.g lib_ldap.

  • All prometheus exporter modules are now defined as submodules. The exporters are configured using services.prometheus.exporters.

B.7.4. Other Notable Changes

  • ZNC option services.znc.mutable now defaults to true. That means that old configuration is not overwritten by default when update to the znc options are made.

  • The option networking.wireless.networks.<name>.auth has been added for wireless networks with WPA-Enterprise authentication. There is also a new extraConfig option to directly configure wpa_supplicant and hidden to connect to hidden networks.

  • In the module networking.interfaces.<name> the following options have been removed:

    • ipAddress

    • ipv6Address

    • prefixLength

    • ipv6PrefixLength

    • subnetMask

    To assign static addresses to an interface the options ipv4.addresses and ipv6.addresses should be used instead. The options ip4 and ip6 have been renamed to ipv4.addresses ipv6.addresses respectively. The new options ipv4.routes and ipv6.routes have been added to set up static routing.

  • The option services.logstash.listenAddress is now by default. Previously the default behaviour was to listen on all interfaces.

  • services.btrfs.autoScrub has been added, to periodically check btrfs filesystems for data corruption. If there's a correct copy available, it will automatically repair corrupted blocks.

  • displayManager.lightdm.greeters.gtk.clock-format. has been added, the clock format string (as expected by strftime, e.g. %H:%M) to use with the lightdm gtk greeter panel.

    If set to null the default clock format is used.

  • displayManager.lightdm.greeters.gtk.indicators has been added, a list of allowed indicator modules to use with the lightdm gtk greeter panel.

    Built-in indicators include ~a11y, ~language, ~session, ~power, ~clock, ~host, ~spacer. Unity indicators can be represented by short name (e.g. sound, power), service file name, or absolute path.

    If set to null the default indicators are used.

    In order to have the previous default configuration add

      services.xserver.displayManager.lightdm.greeters.gtk.indicators = [
        "~host" "~spacer"
        "~clock" "~spacer"

    to your configuration.nix.

  • The NixOS test driver supports user services declared by The methods waitForUnit, getUnitInfo, startJob and stopJob provide an optional $user argument for that purpose.

  • Enabling bash completion on NixOS, programs.bash.enableCompletion, will now also enable completion for the Nix command line tools by installing the nix-bash-completions package.

B.8. Release 17.09 (“Hummingbird”, 2017/09/??)

B.8.1. Highlights

In addition to numerous new and upgraded packages, this release has the following highlights:

  • The GNOME version is now 3.24. KDE Plasma was upgraded to 5.10, KDE Applications to 17.08.1 and KDE Frameworks to 5.37.

  • The user handling now keeps track of deallocated UIDs/GIDs. When a user or group is revived, this allows it to be allocated the UID/GID it had before. A consequence is that UIDs and GIDs are no longer reused.

  • The module option services.xserver.xrandrHeads now causes the first head specified in this list to be set as the primary head. Apart from that, it's now possible to also set additional options by using an attribute set, for example:

    { services.xserver.xrandrHeads = [
          output = "DVI-0";
          primary = true;
          monitorConfig = ''
            Option "Rotate" "right"

    This will set the DVI-0 output to be the primary head, even though HDMI-0 is the first head in the list.

  • The handling of SSL in the services.nginx module has been cleaned up, renaming the misnamed enableSSL to onlySSL which reflects its original intention. This is not to be used with the already existing forceSSL which creates a second non-SSL virtual host redirecting to the SSL virtual host. This by chance had worked earlier due to specific implementation details. In case you had specified both please remove the enableSSL option to keep the previous behaviour.

    Another addSSL option has been introduced to configure both a non-SSL virtual host and an SSL virtual host with the same configuration.

    Options to configure resolver options and upstream blocks have been introduced. See their information for further details.

    The port option has been replaced by a more generic listen option which makes it possible to specify multiple addresses, ports and SSL configs dependant on the new SSL handling mentioned above.

B.8.2. New Services

The following new services were added since the last release:

  • config/fonts/fontconfig-penultimate.nix

  • config/fonts/fontconfig-ultimate.nix

  • config/terminfo.nix

  • hardware/sensor/iio.nix

  • hardware/nitrokey.nix

  • hardware/raid/hpsa.nix

  • programs/browserpass.nix

  • programs/gnupg.nix

  • programs/qt5ct.nix

  • programs/slock.nix

  • programs/thefuck.nix

  • security/auditd.nix

  • security/lock-kernel-modules.nix

  • service-managers/docker.nix

  • service-managers/trivial.nix

  • services/admin/salt/master.nix

  • services/admin/salt/minion.nix

  • services/audio/slimserver.nix

  • services/cluster/kubernetes/default.nix

  • services/cluster/kubernetes/dns.nix

  • services/cluster/kubernetes/dashboard.nix

  • services/continuous-integration/hail.nix

  • services/databases/clickhouse.nix

  • services/databases/postage.nix

  • services/desktops/gnome3/gnome-disks.nix

  • services/desktops/gnome3/gpaste.nix

  • services/logging/SystemdJournal2Gelf.nix

  • services/logging/heartbeat.nix

  • services/logging/journalwatch.nix

  • services/logging/syslogd.nix

  • services/mail/mailhog.nix

  • services/mail/nullmailer.nix

  • services/misc/airsonic.nix

  • services/misc/autorandr.nix

  • services/misc/exhibitor.nix

  • services/misc/fstrim.nix

  • services/misc/gollum.nix

  • services/misc/irkerd.nix

  • services/misc/jackett.nix

  • services/misc/radarr.nix

  • services/misc/snapper.nix

  • services/monitoring/osquery.nix

  • services/monitoring/prometheus/collectd-exporter.nix

  • services/monitoring/prometheus/fritzbox-exporter.nix

  • services/network-filesystems/kbfs.nix

  • services/networking/dnscache.nix

  • services/networking/fireqos.nix

  • services/networking/iwd.nix

  • services/networking/keepalived/default.nix

  • services/networking/keybase.nix

  • services/networking/lldpd.nix

  • services/networking/matterbridge.nix

  • services/networking/squid.nix

  • services/networking/tinydns.nix

  • services/networking/xrdp.nix

  • services/security/shibboleth-sp.nix

  • services/security/sks.nix

  • services/security/sshguard.nix

  • services/security/torify.nix

  • services/security/usbguard.nix

  • services/security/vault.nix

  • services/system/earlyoom.nix

  • services/system/saslauthd.nix

  • services/web-apps/nexus.nix

  • services/web-apps/pgpkeyserver-lite.nix

  • services/web-apps/piwik.nix

  • services/web-servers/lighttpd/collectd.nix

  • services/web-servers/minio.nix

  • services/x11/display-managers/xpra.nix

  • services/x11/xautolock.nix

  • tasks/filesystems/bcachefs.nix

  • tasks/powertop.nix

B.8.3. Backward Incompatibilities

When upgrading from a previous release, please be aware of the following incompatible changes:

  • In an Qemu-based virtualization environment, the network interface names changed from i.e. enp0s3 to ens3.

    This is due to a kernel configuration change. The new naming is consistent with those of other Linux distributions with systemd. See #29197 for more information.

    A machine is affected if the virt-what tool either returns qemu or kvm and has interface names used in any part of its NixOS configuration, in particular if a static network configuration with networking.interfaces is used.

    Before rebooting affected machines, please ensure:

    • Change the interface names in your NixOS configuration. The first interface will be called ens3, the second one ens8 and starting from there incremented by 1.

    • After changing the interface names, rebuild your system with nixos-rebuild boot to activate the new configuration after a reboot. If you switch to the new configuration right away you might lose network connectivity! If using nixops, deploy with nixops deploy --force-reboot.

  • The following changes apply if the stateVersion is changed to 17.09 or higher. For stateVersion = "17.03" or lower the old behavior is preserved.

    • The postgres default version was changed from 9.5 to 9.6.

    • The postgres superuser name has changed from root to postgres to more closely follow what other Linux distributions are doing.

    • The postgres default dataDir has changed from /var/db/postgres to /var/lib/postgresql/$psqlSchema where $psqlSchema is 9.6 for example.

    • The mysql default dataDir has changed from /var/mysql to /var/lib/mysql.

    • Radicale's default package has changed from 1.x to 2.x. Instructions to migrate can be found here . It is also possible to use the newer version by setting the package to radicale2, which is done automatically when stateVersion is 17.09 or higher. The extraArgs option has been added to allow passing the data migration arguments specified in the instructions; see the radicale.nix NixOS test for an example migration.

  • The aiccu package was removed. This is due to SixXS sunsetting its IPv6 tunnel.

  • The fanctl package and fan module have been removed due to the developers not upstreaming their iproute2 patches and lagging with compatibility to recent iproute2 versions.

  • Top-level idea package collection was renamed. All JetBrains IDEs are now at jetbrains.

  • flexget's state database cannot be upgraded to its new internal format, requiring removal of any existing db-config.sqlite which will be automatically recreated.

  • The ipfs service now doesn't ignore the dataDir option anymore. If you've ever set this option to anything other than the default you'll have to either unset it (so the default gets used) or migrate the old data manually with

    mv /var/lib/ipfs/.ipfs/* $dataDir
    rmdir /var/lib/ipfs/.ipfs

  • The caddy service was previously using an extra .caddy directory in the data directory specified with the dataDir option. The contents of the .caddy directory are now expected to be in the dataDir.

  • The ssh-agent user service is not started by default anymore. Use programs.ssh.startAgent to enable it if needed. There is also a new programs.gnupg.agent module that creates a gpg-agent user service. It can also serve as a SSH agent if enableSSHSupport is set.

  • The services.tinc.networks.<name>.listenAddress option had a misleading name that did not correspond to its behavior. It now correctly defines the ip to listen for incoming connections on. To keep the previous behaviour, use services.tinc.networks.<name>.bindToAddress instead. Refer to the description of the options for more details.

  • tlsdate package and module were removed. This is due to the project being dead and not building with openssl 1.1.

  • wvdial package and module were removed. This is due to the project being dead and not building with openssl 1.1.

  • cc-wrapper's setup-hook now exports a number of environment variables corresponding to binutils binaries, (e.g. LD, STRIP, RANLIB, etc). This is done to prevent packages' build systems guessing, which is harder to predict, especially when cross-compiling. However, some packages have broken due to this—their build systems either not supporting, or claiming to support without adequate testing, taking such environment variables as parameters.

  • services.firefox.syncserver now runs by default as a non-root user. To accomodate this change, the default sqlite database location has also been changed. Migration should work automatically. Refer to the description of the options for more details.

  • The compiz window manager and package was removed. The system support had been broken for several years.

  • Touchpad support should now be enabled through libinput as synaptics is now deprecated. See the option services.xserver.libinput.enable.

  • grsecurity/PaX support has been dropped, following upstream's decision to cease free support. See upstream's announcement for more information. No complete replacement for grsecurity/PaX is available presently.

  • services.mysql now has declarative configuration of databases and users with the ensureDatabases and ensureUsers options.

    These options will never delete existing databases and users, especially not when the value of the options are changed.

    The MySQL users will be identified using Unix socket authentication. This authenticates the Unix user with the same name only, and that without the need for a password.

    If you have previously created a MySQL root user with a password, you will need to add root user for unix socket authentication before using the new options. This can be done by running the following SQL script:

    CREATE USER 'root'@'%' IDENTIFIED BY '';
    -- Optionally, delete the password-authenticated user:
    -- DROP USER 'root'@'localhost';

  • services.mysqlBackup now works by default without any user setup, including for users other than mysql.

    By default, the mysql user is no longer the user which performs the backup. Instead a system account mysqlbackup is used.

    The mysqlBackup service is also now using systemd timers instead of cron.

    Therefore, the services.mysqlBackup.period option no longer exists, and has been replaced with services.mysqlBackup.calendar, which is in the format of systemd.time(7).

    If you expect to be sent an e-mail when the backup fails, consider using a script which monitors the systemd journal for errors. Regretfully, at present there is no built-in functionality for this.

    You can check that backups still work by running systemctl start mysql-backup then systemctl status mysql-backup.

  • Templated systemd services e.g container@name are now handled currectly when switching to a new configuration, resulting in them being reloaded.

  • Steam: the newStdcpp parameter was removed and should not be needed anymore.

  • Redis has been updated to version 4 which mandates a cluster mass-restart, due to changes in the network handling, in order to ensure compatibility with networks NATing traffic.

B.8.4. Other Notable Changes

  • Modules can now be disabled by using disabledModules, allowing another to take it's place. This can be used to import a set of modules from another channel while keeping the rest of the system on a stable release.

  • Updated to FreeType 2.7.1, including a new TrueType engine. The new engine replaces the Infinality engine which was the default in NixOS. The default font rendering settings are now provided by fontconfig-penultimate, replacing fontconfig-ultimate; the new defaults are less invasive and provide rendering that is more consistent with other systems and hopefully with each font designer's intent. Some system-wide configuration has been removed from the Fontconfig NixOS module where user Fontconfig settings are available.

  • ZFS/SPL have been updated to 0.7.0, zfsUnstable, splUnstable have therefore been removed.

  • The time.timeZone option now allows the value null in addition to timezone strings. This value allows changing the timezone of a system imperatively using timedatectl set-timezone. The default timezone is still UTC.

  • Nixpkgs overlays may now be specified with a file as well as a directory. The value of <nixpkgs-overlays> may be a file, and ~/.config/nixpkgs/overlays.nix can be used instead of the ~/.config/nixpkgs/overlays directory.

    See the overlays chapter of the Nixpkgs manual for more details.

  • Definitions for /etc/hosts can now be specified declaratively with networking.hosts.

  • Two new options have been added to the installer loader, in addition to the default having changed. The kernel log verbosity has been lowered to the upstream default for the default options, in order to not spam the console when e.g. joining a network.

    This therefore leads to adding a new debug option to set the log level to the previous verbose mode, to make debugging easier, but still accessible easily.

    Additionally a copytoram option has been added, which makes it possible to remove the install medium after booting. This allows tethering from your phone after booting from it.

  • services.gitlab-runner.configOptions has been added to specify the configuration of gitlab-runners declaratively.

  • services.jenkins.plugins has been added to install plugins easily, this can be generated with jenkinsPlugins2nix.

  • services.postfix.config has been added to specify the with NixOS options. Additionally other options have been added to the postfix module and has been improved further.

  • The GitLab package and module have been updated to the latest 10.0 release.

  • The systemd-boot boot loader now lists the NixOS version, kernel version and build date of all bootable generations.

  • The dnscrypt-proxy service now defaults to using a random upstream resolver, selected from the list of public non-logging resolvers with DNSSEC support. Existing configurations can be migrated to this mode of operation by omitting the services.dnscrypt-proxy.resolverName option or setting it to "random".

B.9. Release 17.03 (“Gorilla”, 2017/03/31)

B.9.1. Highlights

In addition to numerous new and upgraded packages, this release has the following highlights:

  • Nixpkgs is now extensible through overlays. See the Nixpkgs manual for more information.

  • This release is based on Glibc 2.25, GCC 5.4.0 and systemd 232. The default Linux kernel is 4.9 and Nix is at 1.11.8.

  • The default desktop environment now is KDE's Plasma 5. KDE 4 has been removed

  • The setuid wrapper functionality now supports setting capabilities.

  • server uses branch 1.19. Due to ABI incompatibilities, ati_unfree keeps forcing 1.17 and amdgpu-pro starts forcing 1.18.

  • Cross compilation has been rewritten. See the nixpkgs manual for details. The most obvious breaking change is that in derivations there is no .nativeDrv nor .crossDrv are now cross by default, not native.

  • The overridePackages function has been rewritten to be replaced by overlays

  • Packages in nixpkgs can be marked as insecure through listed vulnerabilities. See the Nixpkgs manual for more information.

  • PHP now defaults to PHP 7.1

B.9.2. New Services

The following new services were added since the last release:

  • hardware/ckb.nix

  • hardware/mcelog.nix

  • hardware/usb-wwan.nix

  • hardware/video/capture/mwprocapture.nix

  • programs/adb.nix

  • programs/chromium.nix

  • programs/gphoto2.nix

  • programs/java.nix

  • programs/mtr.nix

  • programs/oblogout.nix

  • programs/vim.nix

  • programs/wireshark.nix

  • security/dhparams.nix

  • services/audio/ympd.nix

  • services/computing/boinc/client.nix

  • services/continuous-integration/buildbot/master.nix

  • services/continuous-integration/buildbot/worker.nix

  • services/continuous-integration/gitlab-runner.nix

  • services/databases/riak-cs.nix

  • services/databases/stanchion.nix

  • services/desktops/gnome3/gnome-terminal-server.nix

  • services/editors/infinoted.nix

  • services/hardware/illum.nix

  • services/hardware/trezord.nix

  • services/logging/journalbeat.nix

  • services/mail/offlineimap.nix

  • services/mail/postgrey.nix

  • services/misc/couchpotato.nix

  • services/misc/docker-registry.nix

  • services/misc/errbot.nix

  • services/misc/geoip-updater.nix

  • services/misc/gogs.nix

  • services/misc/leaps.nix

  • services/misc/nix-optimise.nix

  • services/misc/ssm-agent.nix

  • services/misc/sssd.nix

  • services/monitoring/arbtt.nix

  • services/monitoring/netdata.nix

  • services/monitoring/prometheus/default.nix

  • services/monitoring/prometheus/alertmanager.nix

  • services/monitoring/prometheus/blackbox-exporter.nix

  • services/monitoring/prometheus/json-exporter.nix

  • services/monitoring/prometheus/nginx-exporter.nix

  • services/monitoring/prometheus/node-exporter.nix

  • services/monitoring/prometheus/snmp-exporter.nix

  • services/monitoring/prometheus/unifi-exporter.nix

  • services/monitoring/prometheus/varnish-exporter.nix

  • services/monitoring/sysstat.nix

  • services/monitoring/telegraf.nix

  • services/monitoring/vnstat.nix

  • services/network-filesystems/cachefilesd.nix

  • services/network-filesystems/glusterfs.nix

  • services/network-filesystems/ipfs.nix

  • services/networking/dante.nix

  • services/networking/dnscrypt-wrapper.nix

  • services/networking/fakeroute.nix

  • services/networking/flannel.nix

  • services/networking/htpdate.nix

  • services/networking/miredo.nix

  • services/networking/nftables.nix

  • services/networking/powerdns.nix

  • services/networking/pdns-recursor.nix

  • services/networking/quagga.nix

  • services/networking/redsocks.nix

  • services/networking/wireguard.nix

  • services/system/cgmanager.nix

  • services/torrent/opentracker.nix

  • services/web-apps/atlassian/confluence.nix

  • services/web-apps/atlassian/crowd.nix

  • services/web-apps/atlassian/jira.nix

  • services/web-apps/frab.nix

  • services/web-apps/nixbot.nix

  • services/web-apps/selfoss.nix

  • services/web-apps/quassel-webserver.nix

  • services/x11/unclutter-xfixes.nix

  • services/x11/urxvtd.nix

  • system/boot/systemd-nspawn.nix

  • virtualisation/ecs-agent.nix

  • virtualisation/lxcfs.nix

  • virtualisation/openstack/keystone.nix

  • virtualisation/openstack/glance.nix

B.9.3. Backward Incompatibilities

When upgrading from a previous release, please be aware of the following incompatible changes:

  • Derivations have no .nativeDrv nor .crossDrv and are now cross by default, not native.

  • stdenv.overrides is now expected to take self and super arguments. See lib.trivial.extends for what those parameters represent.

  • ansible now defaults to ansible version 2 as version 1 has been removed due to a serious vulnerability unpatched by upstream.

  • gnome alias has been removed along with gtk, gtkmm and several others. Now you need to use versioned attributes, like gnome3.

  • The attribute name of the Radicale daemon has been changed from pythonPackages.radicale to radicale.

  • The stripHash bash function in stdenv changed according to its documentation; it now outputs the stripped name to stdout instead of putting it in the variable strippedName.

  • PHP now scans for extra configuration .ini files in /etc/php.d instead of /etc. This prevents accidentally loading non-PHP .ini files that may be in /etc.

  • Two lone top-level dict dbs moved into dictdDBs. This affects: dictdWordnet which is now at dictdDBs.wordnet and dictdWiktionary which is now at dictdDBs.wiktionary

  • Parsoid service now uses YAML configuration format. service.parsoid.interwikis is now called service.parsoid.wikis and is a list of either API URLs or attribute sets as specified in parsoid's documentation.

  • Ntpd was replaced by systemd-timesyncd as the default service to synchronize system time with a remote NTP server. The old behavior can be restored by setting services.ntp.enable to true. Upstream time servers for all NTP implementations are now configured using networking.timeServers.

  • service.nylon is now declared using named instances. As an example:

      services.nylon = {
        enable = true;
        acceptInterface = "br0";
        bindInterface = "tun1";
        port = 5912;

    should be replaced with:

      services.nylon.myvpn = {
        enable = true;
        acceptInterface = "br0";
        bindInterface = "tun1";
        port = 5912;

    this enables you to declare a SOCKS proxy for each uplink.

  • overridePackages function no longer exists. It is replaced by overlays. For example, the following code:

      pkgs = import <nixpkgs> {};
      pkgs.overridePackages (self: super: ...)

    should be replaced by:

      pkgs = import <nixpkgs> {};
      import pkgs.path { overlays = [(self: super: ...)]; }

  • Autoloading connection tracking helpers is now disabled by default. This default was also changed in the Linux kernel and is considered insecure if not configured properly in your firewall. If you need connection tracking helpers (i.e. for active FTP) please enable networking.firewall.autoLoadConntrackHelpers and tune networking.firewall.connectionTrackingModules to suit your needs.

  • local_recipient_maps is not set to empty value by Postfix service. It's an insecure default as stated by Postfix documentation. Those who want to retain this setting need to set it via services.postfix.extraConfig.

  • Iputils no longer provide ping6 and traceroute6. The functionality of these tools has been integrated into ping and traceroute respectively. To enforce an address family the new flags -4 and -6 have been added. One notable incompatibility is that specifying an interface (for link-local IPv6 for instance) is no longer done with the -I flag, but by encoding the interface into the address (ping fe80::1%eth0).

  • The socket handling of the services.rmilter module has been fixed and refactored. As rmilter doesn't support binding to more than one socket, the options bindUnixSockets and bindInetSockets have been replaced by services.rmilter.bindSocket.*. The default is still a unix socket in /run/rmilter/rmilter.sock. Refer to the options documentation for more information.

  • The fetch* functions no longer support md5, please use sha256 instead.

  • The dnscrypt-proxy module interface has been streamlined around the extraArgs option. Where possible, legacy option declarations are mapped to extraArgs but will emit warnings. The resolverList has been outright removed: to use an unlisted resolver, use the customResolver option.

  • torbrowser now stores local state under ~/.local/share/tor-browser by default. Any browser profile data from the old location, ~/.torbrowser4, must be migrated manually.

  • The ihaskell, monetdb, offlineimap and sitecopy services have been removed.

B.9.4. Other Notable Changes

  • Module type system have a new extensible option types feature that allow to extend certain types, such as enum, through multiple option declarations of the same option across multiple modules.

  • jre now defaults to GTK UI by default. This improves visual consistency and makes Java follow system font style, improving the situation on HighDPI displays. This has a cost of increased closure size; for server and other headless workloads it's recommended to use jre_headless.

  • Python 2.6 interpreter and package set have been removed.

  • The Python 2.7 interpreter does not use modules anymore. Instead, all CPython interpreters now include the whole standard library except for `tkinter`, which is available in the Python package set.

  • Python 2.7, 3.5 and 3.6 are now built deterministically and 3.4 mostly. Minor modifications had to be made to the interpreters in order to generate deterministic bytecode. This has security implications and is relevant for those using Python in a nix-shell. See the Nixpkgs manual for details.

  • The Python package sets now use a fixed-point combinator and the sets are available as attributes of the interpreters.

  • The Python function buildPythonPackage has been improved and can be used to build from Setuptools source, Flit source, and precompiled Wheels.

  • When adding new or updating current Python libraries, the expressions should be put in separate files in pkgs/development/python-modules and called from python-packages.nix.

  • The dnscrypt-proxy service supports synchronizing the list of public resolvers without working DNS resolution. This fixes issues caused by the resolver list becoming outdated. It also improves the viability of DNSCrypt only configurations.

  • Containers using bridged networking no longer lose their connection after changes to the host networking.

  • ZFS supports pool auto scrubbing.

  • The bind DNS utilities (e.g. dig) have been split into their own output and are now also available in pkgs.dnsutils and it is no longer necessary to pull in all of bind to use them.

  • Per-user configuration was moved from ~/.nixpkgs to ~/.config/nixpkgs. The former is still valid for config.nix for backwards compatibility.

B.10. Release 16.09 (“Flounder”, 2016/09/30)

In addition to numerous new and upgraded packages, this release has the following highlights:

  • Many NixOS configurations and Nix packages now use significantly less disk space, thanks to the extensive work on closure size reduction. For example, the closure size of a minimal NixOS container went down from ~424 MiB in 16.03 to ~212 MiB in 16.09, while the closure size of Firefox went from ~651 MiB to ~259 MiB.

  • To improve security, packages are now built using various hardening features. See the Nixpkgs manual for more information.

  • Support for PXE netboot. See Section 2.5.2, “Booting from the netboot media (PXE)” for documentation.

  • server 1.18. If you use the ati_unfree driver, 1.17 is still used due to an ABI incompatibility.

  • This release is based on Glibc 2.24, GCC 5.4.0 and systemd 231. The default Linux kernel remains 4.4.

The following new services were added since the last release:

  • (this will get automatically generated at release time)

When upgrading from a previous release, please be aware of the following incompatible changes:

  • A large number of packages have been converted to use the multiple outputs feature of Nix to greatly reduce the amount of required disk space, as mentioned above. This may require changes to any custom packages to make them build again; see the relevant chapter in the Nixpkgs manual for more information. (Additional caveat to packagers: some packaging conventions related to multiple-output packages were changed late (August 2016) in the release cycle and differ from the initial introduction of multiple outputs.)

  • Previous versions of Nixpkgs had support for all versions of the LTS Haskell package set. That support has been dropped. The previously provided haskell.packages.lts-x_y package sets still exist in name to aviod breaking user code, but these package sets don't actually contain the versions mandated by the corresponding LTS release. Instead, our package set it loosely based on the latest available LTS release, i.e. LTS 7.x at the time of this writing. New releases of NixOS and Nixpkgs will drop those old names entirely. The motivation for this change has been discussed at length on the nix-dev mailing list and in Github issue #14897. Development strategies for Haskell hackers who want to rely on Nix and NixOS have been described in another nix-dev article.

  • Shell aliases for systemd sub-commands were dropped: start, stop, restart, status.

  • Redis now binds to only instead of listening to all network interfaces. This is the default behavior of Redis 3.2

  • /var/empty is now immutable. Activation script runs chattr +i to forbid any modifications inside the folder. See the pull request for what bugs this caused.

  • Gitlab's maintainance script gitlab-runner was removed and split up into the more clearer gitlab-run and gitlab-rake scripts, because gitlab-runner is a component of Gitlab CI.

  • services.xserver.libinput.accelProfile default changed from flat to adaptive, as per official documentation.

  • fonts.fontconfig.ultimate.rendering was removed because our presets were obsolete for some time. New presets are hardcoded into FreeType; you can select a preset via fonts.fontconfig.ultimate.preset. You can customize those presets via ordinary environment variables, using environment.variables.

  • The audit service is no longer enabled by default. Use security.audit.enable = true to explicitly enable it.

  • pkgs.linuxPackages.virtualbox now contains only the kernel modules instead of the VirtualBox user space binaries. If you want to reference the user space binaries, you have to use the new pkgs.virtualbox instead.

  • goPackages was replaced with separated Go applications in appropriate nixpkgs categories. Each Go package uses its own dependency set. There's also a new go2nix tool introduced to generate a Go package definition from its Go source automatically.

  • services.mongodb.extraConfig configuration format was changed to YAML.

  • PHP has been upgraded to 7.0

Other notable improvements:

  • Revamped grsecurity/PaX support. There is now only a single general-purpose distribution kernel and the configuration interface has been streamlined. Desktop users should be able to simply set

    security.grsecurity.enable = true

    to get a reasonably secure system without having to sacrifice too much functionality.

  • Special filesystems, like /proc, /run and others, now have the same mount options as recommended by systemd and are unified across different places in NixOS. Mount options are updated during nixos-rebuild switch if possible. One benefit from this is improved security — most such filesystems are now mounted with noexec, nodev and/or nosuid options.

  • The reverse path filter was interfering with DHCPv4 server operation in the past. An exception for DHCPv4 and a new option to log packets that were dropped due to the reverse path filter was added (networking.firewall.logReversePathDrops) for easier debugging.

  • Containers configuration within containers.<name>.config is now properly typed and checked. In particular, partial configurations are merged correctly.

  • The directory container setuid wrapper programs, /var/setuid-wrappers, is now updated atomically to prevent failures if the switch to a new configuration is interrupted.

  • services.xserver.startGnuPGAgent has been removed due to GnuPG 2.1.x bump. See how to achieve similar behavior. You might need to pkill gpg-agent after the upgrade to prevent a stale agent being in the way.

  • Declarative users could share the uid due to the bug in the script handling conflict resolution.

  • Gummi boot has been replaced using systemd-boot.

  • Hydra package and NixOS module were added for convenience.

B.11. Release 16.03 (“Emu”, 2016/03/31)

In addition to numerous new and upgraded packages, this release has the following highlights:

  • Systemd 229, bringing numerous improvements over 217.

  • Linux 4.4 (was 3.18).

  • GCC 5.3 (was 4.9). Note that GCC 5 changes the C++ ABI in an incompatible way; this may cause problems if you try to link objects compiled with different versions of GCC.

  • Glibc 2.23 (was 2.21).

  • Binutils 2.26 (was 2.23.1). See #909

  • Improved support for ensuring bitwise reproducible builds. For example, stdenv now sets the environment variable SOURCE_DATE_EPOCH to a deterministic value, and Nix has gained an option to repeat a build a number of times to test determinism. An ongoing project, the goal of exact reproducibility is to allow binaries to be verified independently (e.g., a user might only trust binaries that appear in three independent binary caches).

  • Perl 5.22.

The following new services were added since the last release:

  • services/monitoring/longview.nix

  • hardware/video/webcam/facetimehd.nix

  • i18n/input-method/default.nix

  • i18n/input-method/fcitx.nix

  • i18n/input-method/ibus.nix

  • i18n/input-method/nabi.nix

  • i18n/input-method/uim.nix

  • programs/fish.nix

  • security/acme.nix

  • security/audit.nix

  • security/oath.nix

  • services/hardware/irqbalance.nix

  • services/mail/dspam.nix

  • services/mail/opendkim.nix

  • services/mail/postsrsd.nix

  • services/mail/rspamd.nix

  • services/mail/rmilter.nix

  • services/misc/autofs.nix

  • services/misc/bepasty.nix

  • services/misc/calibre-server.nix

  • services/misc/cfdyndns.nix

  • services/misc/gammu-smsd.nix

  • services/misc/mathics.nix

  • services/misc/matrix-synapse.nix

  • services/misc/octoprint.nix

  • services/monitoring/hdaps.nix

  • services/monitoring/heapster.nix

  • services/monitoring/longview.nix

  • services/network-filesystems/netatalk.nix

  • services/network-filesystems/xtreemfs.nix

  • services/networking/autossh.nix

  • services/networking/dnschain.nix

  • services/networking/gale.nix

  • services/networking/miniupnpd.nix

  • services/networking/namecoind.nix

  • services/networking/ostinato.nix

  • services/networking/pdnsd.nix

  • services/networking/shairport-sync.nix

  • services/networking/supplicant.nix

  • services/search/kibana.nix

  • services/security/haka.nix

  • services/security/physlock.nix

  • services/web-apps/

  • services/x11/hardware/libinput.nix

  • services/x11/window-managers/windowlab.nix

  • system/boot/initrd-network.nix

  • system/boot/initrd-ssh.nix

  • system/boot/loader/loader.nix

  • system/boot/networkd.nix

  • system/boot/resolved.nix

  • virtualisation/lxd.nix

  • virtualisation/rkt.nix

When upgrading from a previous release, please be aware of the following incompatible changes:

  • We no longer produce graphical ISO images and VirtualBox images for i686-linux. A minimal ISO image is still provided.

  • Firefox and similar browsers are now wrapped by default. The package and attribute names are plain firefox or midori, etc. Backward-compatibility attributes were set up, but note that nix-env -u will not update your current firefox-with-plugins; you have to uninstall it and install firefox instead.

  • wmiiSnap has been replaced with wmii_hg, but services.xserver.windowManager.wmii.enable has been updated respectively so this only affects you if you have explicitly installed wmiiSnap.

  • jobs NixOS option has been removed. It served as compatibility layer between Upstart jobs and SystemD services. All services have been rewritten to use

  • wmiimenu is removed, as it has been removed by the developers upstream. Use wimenu from the wmii-hg package.

  • Gitit is no longer automatically added to the module list in NixOS and as such there will not be any manual entries for it. You will need to add an import statement to your NixOS configuration in order to use it, e.g.

      imports = [ <nixpkgs/nixos/modules/services/misc/gitit.nix> ];

    will include the Gitit service configuration options.

  • nginx does not accept flags for enabling and disabling modules anymore. Instead it accepts modules argument, which is a list of modules to be built in. All modules now reside in nginxModules set. Example configuration:

    nginx.override {
      modules = [ nginxModules.rtmp nginxModules.dav nginxModules.moreheaders ];

  • s3sync is removed, as it hasn't been developed by upstream for 4 years and only runs with ruby 1.8. For an actively-developer alternative look at tarsnap and others.

  • ruby_1_8 has been removed as it's not supported from upstream anymore and probably contains security issues.

  • tidy-html5 package is removed. Upstream only provided (lib)tidy5 during development, and now they went back to (lib)tidy to work as a drop-in replacement of the original package that has been unmaintained for years. You can (still) use the html-tidy package, which got updated to a stable release from this new upstream.

  • extraDeviceOptions argument is removed from bumblebee package. Instead there are now two separate arguments: extraNvidiaDeviceOptions and extraNouveauDeviceOptions for setting extra X11 options for nvidia and nouveau drivers, respectively.

  • The Ctrl+Alt+Backspace key combination no longer kills the X server by default. There's a new option services.xserver.enableCtrlAltBackspace allowing to enable the combination again.

  • emacsPackagesNg now contains all packages from the ELPA, MELPA, and MELPA Stable repositories.

  • Data directory for Postfix MTA server is moved from /var/postfix to /var/lib/postfix. Old configurations are migrated automatically. service.postfix module has also received many improvements, such as correct directories' access rights, new aliasFiles and mapFiles options and more.

  • Filesystem options should now be configured as a list of strings, not a comma-separated string. The old style will continue to work, but print a warning, until the 16.09 release. An example of the new style:

    fileSystems."/example" = {
      device = "/dev/sdc";
      fsType = "btrfs";
      options = [ "noatime" "compress=lzo" "space_cache" "autodefrag" ];

  • CUPS, installed by services.printing module, now has its data directory in /var/lib/cups. Old configurations from /etc/cups are moved there automatically, but there might be problems. Also configuration options services.printing.cupsdConf and services.printing.cupsdFilesConf were removed because they had been allowing one to override configuration variables required for CUPS to work at all on NixOS. For most use cases, services.printing.extraConf and new option services.printing.extraFilesConf should be enough; if you encounter a situation when they are not, please file a bug.

    There are also Gutenprint improvements; in particular, a new option services.printing.gutenprint is added to enable automatic updating of Gutenprint PPMs; it's greatly recommended to enable it instead of adding gutenprint to the drivers list.

  • services.xserver.vaapiDrivers has been removed. Use hardware.opengl.extraPackages{,32} instead. You can also specify VDPAU drivers there.

  • programs.ibus moved to i18n.inputMethod.ibus. The option programs.ibus.plugins changed to i18n.inputMethod.ibus.engines and the option to enable ibus changed from programs.ibus.enable to i18n.inputMethod.enabled. i18n.inputMethod.enabled should be set to the used input method name, "ibus" for ibus. An example of the new style:

    i18n.inputMethod.enabled = "ibus";
    i18n.inputMethod.ibus.engines = with pkgs.ibus-engines; [ anthy mozc ];

    That is equivalent to the old version:

    programs.ibus.enable = true;
    programs.ibus.plugins = with pkgs; [ ibus-anthy mozc ];

  • services.udev.extraRules option now writes rules to 99-local.rules instead of 10-local.rules. This makes all the user rules apply after others, so their results wouldn't be overriden by anything else.

  • Large parts of the services.gitlab module has been been rewritten. There are new configuration options available. The stateDir option was renamned to statePath and the satellitesDir option was removed. Please review the currently available options.

  • The option services.nsd.zones.<name>.data no longer interpret the dollar sign ($) as a shell variable, as such it should not be escaped anymore. Thus the following zone data:

    \$TTL 1800
    @       IN      SOA (

    Should modified to look like the actual file expected by nsd:

    $TTL 1800
    @       IN      SOA (
  • service.syncthing.dataDir options now has to point to exact folder where syncthing is writing to. Example configuration should look something like:

    services.syncthing = {
        enable = true;
        dataDir = "/home/somebody/.syncthing";
        user = "somebody";
  • networking.firewall.allowPing is now enabled by default. Users are encouraged to configure an appropriate rate limit for their machines using the Kernel interface at /proc/sys/net/ipv4/icmp_ratelimit and /proc/sys/net/ipv6/icmp/ratelimit or using the firewall itself, i.e. by setting the NixOS option networking.firewall.pingLimit.

  • Systems with some broadcom cards used to result into a generated config that is no longer accepted. If you get errors like

    error: path ‘/nix/store/*-broadcom-sta-*’ does not exist and cannot be created

    you should either re-run nixos-generate-config or manually replace "${config.boot.kernelPackages.broadcom_sta}" by config.boot.kernelPackages.broadcom_sta in your /etc/nixos/hardware-configuration.nix. More discussion is on the github issue.

  • The services.xserver.startGnuPGAgent option has been removed. GnuPG 2.1.x changed the way the gpg-agent works, and that new approach no longer requires (or even supports) the "start everything as a child of the agent" scheme we've implemented in NixOS for older versions. To configure the gpg-agent for your X session, add the following code to ~/.bashrc or some file that’s sourced when your shell is started:

    export GPG_TTY

    If you want to use gpg-agent for SSH, too, add the following to your session initialization (e.g. displayManager.sessionCommands)

    gpg-connect-agent /bye
    unset SSH_AGENT_PID
    export SSH_AUTH_SOCK="''${HOME}/.gnupg/S.gpg-agent.ssh"

    and make sure that


    is included in your ~/.gnupg/gpg-agent.conf. You will need to use ssh-add to re-add your ssh keys. If gpg’s automatic transformation of the private keys to the new format fails, you will need to re-import your private keyring as well:

    gpg --import ~/.gnupg/secring.gpg

    The gpg-agent(1) man page has more details about this subject, i.e. in the "EXAMPLES" section.

Other notable improvements:

  • ejabberd module is brought back and now works on NixOS.

  • Input method support was improved. New NixOS modules (fcitx, nabi and uim), fcitx engines (chewing, hangul, m17n, mozc and table-other) and ibus engines (hangul and m17n) have been added.

B.12. Release 15.09 (“Dingo”, 2015/09/30)

In addition to numerous new and upgraded packages, this release has the following highlights:

  • The Haskell packages infrastructure has been re-designed from the ground up ("Haskell NG"). NixOS now distributes the latest version of every single package registered on Hackage -- well in excess of 8,000 Haskell packages. Detailed instructions on how to use that infrastructure can be found in the User's Guide to the Haskell Infrastructure. Users migrating from an earlier release may find helpful information below, in the list of backwards-incompatible changes. Furthermore, we distribute 51(!) additional Haskell package sets that provide every single LTS Haskell release since version 0.0 as well as the most recent Stackage Nightly snapshot. The announcement "Full Stackage Support in Nixpkgs" gives additional details.

  • Nix has been updated to version 1.10, which among other improvements enables cryptographic signatures on binary caches for improved security.

  • You can now keep your NixOS system up to date automatically by setting

    system.autoUpgrade.enable = true;

    This will cause the system to periodically check for updates in your current channel and run nixos-rebuild.

  • This release is based on Glibc 2.21, GCC 4.9 and Linux 3.18.

  • GNOME has been upgraded to 3.16.

  • Xfce has been upgraded to 4.12.

  • KDE 5 has been upgraded to KDE Frameworks 5.10, Plasma 5.3.2 and Applications 15.04.3. KDE 4 has been updated to kdelibs-4.14.10.

  • E19 has been upgraded to

The following new services were added since the last release:

  • services/mail/exim.nix

  • services/misc/apache-kafka.nix

  • services/misc/canto-daemon.nix

  • services/misc/confd.nix

  • services/misc/devmon.nix

  • services/misc/gitit.nix

  • services/misc/ihaskell.nix

  • services/misc/mbpfan.nix

  • services/misc/mediatomb.nix

  • services/misc/mwlib.nix

  • services/misc/parsoid.nix

  • services/misc/plex.nix

  • services/misc/ripple-rest.nix

  • services/misc/ripple-data-api.nix

  • services/misc/subsonic.nix

  • services/misc/sundtek.nix

  • services/monitoring/cadvisor.nix

  • services/monitoring/das_watchdog.nix

  • services/monitoring/grafana.nix

  • services/monitoring/riemann-tools.nix

  • services/monitoring/teamviewer.nix

  • services/network-filesystems/u9fs.nix

  • services/networking/aiccu.nix

  • services/networking/asterisk.nix

  • services/networking/bird.nix

  • services/networking/charybdis.nix

  • services/networking/docker-registry-server.nix

  • services/networking/fan.nix

  • services/networking/firefox/sync-server.nix

  • services/networking/gateone.nix

  • services/networking/heyefi.nix

  • services/networking/i2p.nix

  • services/networking/lambdabot.nix

  • services/networking/mstpd.nix

  • services/networking/nix-serve.nix

  • services/networking/nylon.nix

  • services/networking/racoon.nix

  • services/networking/skydns.nix

  • services/networking/shout.nix

  • services/networking/softether.nix

  • services/networking/sslh.nix

  • services/networking/tinc.nix

  • services/networking/tlsdated.nix

  • services/networking/tox-bootstrapd.nix

  • services/networking/tvheadend.nix

  • services/networking/zerotierone.nix

  • services/scheduling/marathon.nix

  • services/security/fprintd.nix

  • services/security/hologram.nix

  • services/security/munge.nix

  • services/system/cloud-init.nix

  • services/web-servers/shellinabox.nix

  • services/web-servers/uwsgi.nix

  • services/x11/unclutter.nix

  • services/x11/display-managers/sddm.nix

  • system/boot/coredump.nix

  • system/boot/loader/loader.nix

  • system/boot/loader/generic-extlinux-compatible

  • system/boot/networkd.nix

  • system/boot/resolved.nix

  • system/boot/timesyncd.nix

  • tasks/filesystems/exfat.nix

  • tasks/filesystems/ntfs.nix

  • tasks/filesystems/vboxsf.nix

  • virtualisation/virtualbox-host.nix

  • virtualisation/vmware-guest.nix

  • virtualisation/xen-dom0.nix

When upgrading from a previous release, please be aware of the following incompatible changes:

  • sshd no longer supports DSA and ECDSA host keys by default. If you have existing systems with such host keys and want to continue to use them, please set

    system.stateVersion = "14.12";

    The new option system.stateVersion ensures that certain configuration changes that could break existing systems (such as the sshd host key setting) will maintain compatibility with the specified NixOS release. NixOps sets the state version of existing deployments automatically.

  • cron is no longer enabled by default, unless you have a non-empty services.cron.systemCronJobs. To force cron to be enabled, set services.cron.enable = true.

  • Nix now requires binary caches to be cryptographically signed. If you have unsigned binary caches that you want to continue to use, you should set nix.requireSignedBinaryCaches = false.

  • Steam now doesn't need root rights to work. Instead of using *-steam-chrootenv, you should now just run steam. steamChrootEnv package was renamed to steam, and old steam package -- to steamOriginal.

  • CMPlayer has been renamed to bomi upstream. Package cmplayer was accordingly renamed to bomi

  • Atom Shell has been renamed to Electron upstream. Package atom-shell was accordingly renamed to electron

  • Elm is not released on Hackage anymore. You should now use elmPackages.elm which contains the latest Elm platform.

  • The CUPS printing service has been updated to version 2.0.2. Furthermore its systemd service has been renamed to cups.service.

    Local printers are no longer shared or advertised by default. This behavior can be changed by enabling services.printing.defaultShared or services.printing.browsing respectively.

  • The VirtualBox host and guest options have been named more consistently. They can now found in* instead of services.virtualboxHost.* and virtualisation.virtualbox.guest.* instead of services.virtualboxGuest.*.

    Also, there now is support for the vboxsf file system using the fileSystems configuration attribute. An example of how this can be used in a configuration:

    fileSystems."/shiny" = {
      device = "myshinysharedfolder";
      fsType = "vboxsf";

  • "nix-env -qa" no longer discovers Haskell packages by name. The only packages visible in the global scope are ghc, cabal-install, and stack, but all other packages are hidden. The reason for this inconvenience is the sheer size of the Haskell package set. Name-based lookups are expensive, and most nix-env -qa operations would become much slower if we'd add the entire Hackage database into the top level attribute set. Instead, the list of Haskell packages can be displayed by running:

    nix-env -f "<nixpkgs>" -qaP -A haskellPackages

    Executable programs written in Haskell can be installed with:

    nix-env -f "<nixpkgs>" -iA haskellPackages.pandoc

    Installing Haskell libraries this way, however, is no longer supported. See the next item for more details.

  • Previous versions of NixOS came with a feature called ghc-wrapper, a small script that allowed GHC to transparently pick up on libraries installed in the user's profile. This feature has been deprecated; ghc-wrapper was removed from the distribution. The proper way to register Haskell libraries with the compiler now is the haskellPackages.ghcWithPackages function. The User's Guide to the Haskell Infrastructure provides more information about this subject.

  • All Haskell builds that have been generated with version 1.x of the cabal2nix utility are now invalid and need to be re-generated with a current version of cabal2nix to function. The most recent version of this tool can be installed by running nix-env -i cabal2nix.

  • The haskellPackages set in Nixpkgs used to have a function attribute called extension that users could override in their ~/.nixpkgs/config.nix files to configure additional attributes, etc. That function still exists, but it's now called overrides.

  • The OpenBLAS library has been updated to version 0.2.14. Support for the x86_64-darwin platform was added. Dynamic architecture detection was enabled; OpenBLAS now selects microarchitecture-optimized routines at runtime, so optimal performance is achieved without the need to rebuild OpenBLAS locally. OpenBLAS has replaced ATLAS in most packages which use an optimized BLAS or LAPACK implementation.

  • The phpfpm is now using the default PHP version (pkgs.php) instead of PHP 5.4 (pkgs.php54).

  • The locate service no longer indexes the Nix store by default, preventing packages with potentially numerous versions from cluttering the output. Indexing the store can be activated by setting services.locate.includeStore = true.

  • The Nix expression search path (NIX_PATH) no longer contains /etc/nixos/nixpkgs by default. You can override NIX_PATH by setting nix.nixPath.

  • Python 2.6 has been marked as broken (as it no longer receives security updates from upstream).

  • Any use of module arguments such as pkgs to access library functions, or to define imports attributes will now lead to an infinite loop at the time of the evaluation.

    In case of an infinite loop, use the --show-trace command line argument and read the line just above the error message.

    $ nixos-rebuild build --show-trace
    while evaluating the module argument `pkgs' in "/etc/nixos/my-module.nix":
    infinite recursion encountered

    Any use of pkgs.lib, should be replaced by lib, after adding it as argument of the module. The following module

    { config, pkgs, ... }:
    with pkgs.lib;
      options = {
        foo = mkOption { … };
      config = mkIf { … };

    should be modified to look like:

    { config, pkgs, lib, ... }:
    with lib;
      options = {
        foo = mkOption { option declaration };
      config = mkIf { option definition };

    When pkgs is used to download other projects to import their modules, and only in such cases, it should be replaced by (import <nixpkgs> {}). The following module

    { config, pkgs, ... }:
      myProject = pkgs.fetchurl {
        src = url;
        sha256 = hash;
      imports = [ "${myProject}/module.nix" ];

    should be modified to look like:

    { config, pkgs, ... }:
      myProject = (import <nixpkgs> {}).fetchurl {
        src = url;
        sha256 = hash;
      imports = [ "${myProject}/module.nix" ];

Other notable improvements:

  • The nixos and nixpkgs channels were unified, so one can use nix-env -iA nixos.bash instead of nix-env -iA nixos.pkgs.bash. See the commit for details.

  • Users running an SSH server who worry about the quality of their /etc/ssh/moduli file with respect to the vulnerabilities discovered in the Diffie-Hellman key exchange can now replace OpenSSH's default version with one they generated themselves using the new services.openssh.moduliFile option.

  • A newly packaged TeX Live 2015 is provided in pkgs.texlive, split into 6500 nix packages. For basic user documentation see the source. Beware of an issue when installing a too large package set. The plan is to deprecate and maybe delete the original TeX packages until the next release.

  • buildEnv.env on all Python interpreters is now available for nix-shell interoperability.

B.13. Release 14.12 (“Caterpillar”, 2014/12/30)

In addition to numerous new and upgraded packages, this release has the following highlights:

  • Systemd has been updated to version 217, which has numerous improvements.

  • Nix has been updated to 1.8.

  • NixOS is now based on Glibc 2.20.

  • KDE has been updated to 4.14.

  • The default Linux kernel has been updated to 3.14.

  • If users.mutableUsers is enabled (the default), changes made to the declaration of a user or group will be correctly realised when running nixos-rebuild. For instance, removing a user specification from configuration.nix will cause the actual user account to be deleted. If users.mutableUsers is disabled, it is no longer necessary to specify UIDs or GIDs; if omitted, they are allocated dynamically.

Following new services were added since the last release:

  • atftpd

  • bosun

  • bspwm

  • chronos

  • collectd

  • consul

  • cpuminer-cryptonight

  • crashplan

  • dnscrypt-proxy

  • docker-registry

  • docker

  • etcd

  • fail2ban

  • fcgiwrap

  • fleet

  • fluxbox

  • gdm

  • geoclue2

  • gitlab

  • gitolite

  • gnome3.gnome-documents

  • gnome3.gnome-online-miners

  • gnome3.gvfs

  • gnome3.seahorse

  • hbase

  • i2pd

  • influxdb

  • kubernetes

  • liquidsoap

  • lxc

  • mailpile

  • mesos

  • mlmmj

  • monetdb

  • mopidy

  • neo4j

  • nsd

  • openntpd

  • opentsdb

  • openvswitch

  • parallels-guest

  • peerflix

  • phd

  • polipo

  • prosody

  • radicale

  • redmine

  • riemann

  • scollector

  • seeks

  • siproxd

  • strongswan

  • tcsd

  • teamspeak3

  • thermald

  • torque/mrom

  • torque/server

  • uhub

  • unifi

  • znc

  • zookeeper

When upgrading from a previous release, please be aware of the following incompatible changes:

  • The default version of Apache httpd is now 2.4. If you use the extraConfig option to pass literal Apache configuration text, you may need to update it — see Apache’s documentation for details. If you wish to continue to use httpd 2.2, add the following line to your NixOS configuration:

    services.httpd.package = pkgs.apacheHttpd_2_2;

  • PHP 5.3 has been removed because it is no longer supported by the PHP project. A migration guide is available.

  • The host side of a container virtual Ethernet pair is now called ve-container-name rather than c-container-name.

  • GNOME 3.10 support has been dropped. The default GNOME version is now 3.12.

  • VirtualBox has been upgraded to 4.3.20 release. Users may be required to run rm -rf /tmp/.vbox*. The line imports = [ <nixpkgs/nixos/modules/programs/virtualbox.nix> ] is no longer necessary, use services.virtualboxHost.enable = true instead.

    Also, hardening mode is now enabled by default, which means that unless you want to use USB support, you no longer need to be a member of the vboxusers group.

  • Chromium has been updated to 39.0.2171.65. enablePepperPDF is now enabled by default. chromium*Wrapper packages no longer exist, because upstream removed NSAPI support. chromium-stable has been renamed to chromium.

  • Python packaging documentation is now part of nixpkgs manual. To override the python packages available to a custom python you now use pkgs.pythonFull.buildEnv.override instead of pkgs.pythonFull.override.

  • boot.resumeDevice = "8:6" is no longer supported. Most users will want to leave it undefined, which takes the swap partitions automatically. There is an evaluation assertion to ensure that the string starts with a slash.

  • The system-wide default timezone for NixOS installations changed from CET to UTC. To choose a different timezone for your system, configure time.timeZone in configuration.nix. A fairly complete list of possible values for that setting is available at

  • GNU screen has been updated to 4.2.1, which breaks the ability to connect to sessions created by older versions of screen.

  • The Intel GPU driver was updated to the 3.x prerelease version (used by most distributions) and supports DRI3 now.

B.14. Release 14.04 (“Baboon”, 2014/04/30)

This is the second stable release branch of NixOS. In addition to numerous new and upgraded packages and modules, this release has the following highlights:

  • Installation on UEFI systems is now supported. See Chapter 2, Installing NixOS for details.

  • Systemd has been updated to version 212, which has numerous improvements. NixOS now automatically starts systemd user instances when you log in. You can define global user units through the systemd.unit.* options.

  • NixOS is now based on Glibc 2.19 and GCC 4.8.

  • The default Linux kernel has been updated to 3.12.

  • KDE has been updated to 4.12.

  • GNOME 3.10 experimental support has been added.

  • Nix has been updated to 1.7 (details).

  • NixOS now supports fully declarative management of users and groups. If you set users.mutableUsers to false, then the contents of /etc/passwd and /etc/group will be congruent to your NixOS configuration. For instance, if you remove a user from users.extraUsers and run nixos-rebuild, the user account will cease to exist. Also, imperative commands for managing users and groups, such as useradd, are no longer available. If users.mutableUsers is true (the default), then behaviour is unchanged from NixOS 13.10.

  • NixOS now has basic container support, meaning you can easily run a NixOS instance as a container in a NixOS host system. These containers are suitable for testing and experimentation but not production use, since they’re not fully isolated from the host. See Chapter 48, Container Management for details.

  • Systemd units provided by packages can now be overridden from the NixOS configuration. For instance, if a package foo provides systemd units, you can say:

    systemd.packages = [ ];

    to enable those units. You can then set or override unit options in the usual way, e.g. = [ "" ]; = "512M";

When upgrading from a previous release, please be aware of the following incompatible changes:

  • Nixpkgs no longer exposes unfree packages by default. If your NixOS configuration requires unfree packages from Nixpkgs, you need to enable support for them explicitly by setting:

    nixpkgs.config.allowUnfree = true;

    Otherwise, you get an error message such as:

    error: package ‘nvidia-x11-331.49-3.12.17’ in ‘…/nvidia-x11/default.nix:56’
      has an unfree license, refusing to evaluate

  • The Adobe Flash player is no longer enabled by default in the Firefox and Chromium wrappers. To enable it, you must set:

    nixpkgs.config.allowUnfree = true;
    nixpkgs.config.firefox.enableAdobeFlash = true; # for Firefox
    nixpkgs.config.chromium.enableAdobeFlash = true; # for Chromium

  • The firewall is now enabled by default. If you don’t want this, you need to disable it explicitly:

    networking.firewall.enable = false;

  • The option boot.loader.grub.memtest86 has been renamed to boot.loader.grub.memtest86.enable.

  • The mysql55 service has been merged into the mysql service, which no longer sets a default for the option services.mysql.package.

  • Package variants are now differentiated by suffixing the name, rather than the version. For instance, sqlite- is now called sqlite-interactive- This ensures that nix-env -i sqlite is unambiguous, and that nix-env -u won’t “upgrade” sqlite to sqlite-interactive or vice versa. Notably, this change affects the Firefox wrapper (which provides plugins), as it is now called firefox-wrapper. So when using nix-env, you should do nix-env -e firefox; nix-env -i firefox-wrapper if you want to keep using the wrapper. This change does not affect declarative package management, since attribute names like pkgs.firefoxWrapper were already unambiguous.

  • The symlink /etc/ca-bundle.crt is gone. Programs should instead use the environment variable OPENSSL_X509_CERT_FILE (which points to /etc/ssl/certs/ca-bundle.crt).

B.15. Release 13.10 (“Aardvark”, 2013/10/31)

This is the first stable release branch of NixOS.