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depot/third_party/nixpkgs/nixos/doc/manual/release-notes/rl-2003.section.md
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GitOrigin-RevId: c757e9bd77b16ca2e03c89bf8bc9ecb28e0c06ad
2023-11-16 04:20:00 +00:00

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Release 20.03 ("Markhor", 2020.04/20)

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).

  • Grub is updated to 2.04, adding support for booting from F2FS filesystems and Btrfs volumes using zstd compression. Note that some users have been unable to boot after upgrading to 2.04 - for more information, please see this discussion.

  • 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 https://github.com/NixOS/nixpkgs/pull/71684 for details.

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

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

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 99-main.network 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 database.host 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:

    {
  users.users.me =
    { 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 services.xserver.displayManager.auto 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:

    {
  security.pam.services.lightdm-autologin.text = lib.mkForce ''
      auth     requisite pam_nologin.so
      auth     required  pam_succeed_if.so quiet
      auth     required  pam_permit.so

      account  include   lightdm

      password include   lightdm

      session  include   lightdm
  '';
}

    The difference is the:

    auth required pam_succeed_if.so quiet

    line, where default it's:

     auth required pam_succeed_if.so 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 = [ "127.0.0.1:43" ];
    sources.public-resolvers = {
      urls = [ "https://download.dnscrypt.info/resolvers-list/v2/public-resolvers.md" ];
      cache_file = "public-resolvers.md";
      minisign_key = "RWQf6LRCGA9i53mlYecO4IzT51TGPpvWucNSCh1CBM0QTaLn73Y7GFO3";
      refresh_delay = 72;
    };
  };

  services.dnsmasq.enable = true;
  services.dnsmasq.servers = [ "127.0.0.1#43" ];
}

  • 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-vms8 -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.

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 services.nginx.group). 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 = config.services.nginx; in ''user ${cfg.user} ${cfg.group};'';
  systemd.services.nginx.serviceConfig.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 security.acme.email 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 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 systemd.network.links 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. :::