<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-release-17.09">
  <title>Release 17.09 (<quote>Hummingbird</quote>, 2017/09/??)</title>
  <section xml:id="sec-release-17.09-highlights">
    <title>Highlights</title>
    <para>
      In addition to numerous new and upgraded packages, this release
      has the following highlights:
    </para>
    <itemizedlist>
      <listitem>
        <para>
          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.
        </para>
      </listitem>
      <listitem>
        <para>
          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.
        </para>
      </listitem>
      <listitem>
        <para>
          The module option
          <literal>services.xserver.xrandrHeads</literal> 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:
        </para>
        <programlisting language="bash">
{ services.xserver.xrandrHeads = [
    &quot;HDMI-0&quot;
    {
      output = &quot;DVI-0&quot;;
      primary = true;
      monitorConfig = ''
        Option &quot;Rotate&quot; &quot;right&quot;
      '';
    }
  ];
}
</programlisting>
        <para>
          This will set the <literal>DVI-0</literal> output to be the
          primary head, even though <literal>HDMI-0</literal> is the
          first head in the list.
        </para>
      </listitem>
      <listitem>
        <para>
          The handling of SSL in the <literal>services.nginx</literal>
          module has been cleaned up, renaming the misnamed
          <literal>enableSSL</literal> to <literal>onlySSL</literal>
          which reflects its original intention. This is not to be used
          with the already existing <literal>forceSSL</literal> 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 <literal>enableSSL</literal> option to
          keep the previous behaviour.
        </para>
        <para>
          Another <literal>addSSL</literal> option has been introduced
          to configure both a non-SSL virtual host and an SSL virtual
          host with the same configuration.
        </para>
        <para>
          Options to configure <literal>resolver</literal> options and
          <literal>upstream</literal> blocks have been introduced. See
          their information for further details.
        </para>
        <para>
          The <literal>port</literal> option has been replaced by a more
          generic <literal>listen</literal> option which makes it
          possible to specify multiple addresses, ports and SSL configs
          dependant on the new SSL handling mentioned above.
        </para>
      </listitem>
    </itemizedlist>
  </section>
  <section xml:id="sec-release-17.09-new-services">
    <title>New Services</title>
    <para>
      The following new services were added since the last release:
    </para>
    <itemizedlist>
      <listitem>
        <para>
          <literal>config/fonts/fontconfig-penultimate.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>config/fonts/fontconfig-ultimate.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>config/terminfo.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>hardware/sensor/iio.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>hardware/nitrokey.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>hardware/raid/hpsa.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>programs/browserpass.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>programs/gnupg.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>programs/qt5ct.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>programs/slock.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>programs/thefuck.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>security/auditd.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>security/lock-kernel-modules.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>service-managers/docker.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>service-managers/trivial.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/admin/salt/master.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/admin/salt/minion.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/audio/slimserver.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/cluster/kubernetes/default.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/cluster/kubernetes/dns.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/cluster/kubernetes/dashboard.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/continuous-integration/hail.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/databases/clickhouse.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/databases/postage.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/desktops/gnome3/gnome-disks.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/desktops/gnome3/gpaste.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/logging/SystemdJournal2Gelf.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/logging/heartbeat.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/logging/journalwatch.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/logging/syslogd.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/mail/mailhog.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/mail/nullmailer.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/misc/airsonic.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/misc/autorandr.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/misc/exhibitor.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/misc/fstrim.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/misc/gollum.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/misc/irkerd.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/misc/jackett.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/misc/radarr.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/misc/snapper.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/monitoring/osquery.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/monitoring/prometheus/collectd-exporter.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/monitoring/prometheus/fritzbox-exporter.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/network-filesystems/kbfs.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/networking/dnscache.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/networking/fireqos.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/networking/iwd.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/networking/keepalived/default.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/networking/keybase.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/networking/lldpd.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/networking/matterbridge.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/networking/squid.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/networking/tinydns.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/networking/xrdp.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/security/shibboleth-sp.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/security/sks.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/security/sshguard.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/security/torify.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/security/usbguard.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/security/vault.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/system/earlyoom.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/system/saslauthd.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/web-apps/nexus.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/web-apps/pgpkeyserver-lite.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/web-apps/piwik.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/web-servers/lighttpd/collectd.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/web-servers/minio.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/x11/display-managers/xpra.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services/x11/xautolock.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>tasks/filesystems/bcachefs.nix</literal>
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>tasks/powertop.nix</literal>
        </para>
      </listitem>
    </itemizedlist>
  </section>
  <section xml:id="sec-release-17.09-incompatibilities">
    <title>Backward Incompatibilities</title>
    <para>
      When upgrading from a previous release, please be aware of the
      following incompatible changes:
    </para>
    <itemizedlist>
      <listitem>
        <para>
          <emphasis role="strong">In an Qemu-based virtualization
          environment, the network interface names changed from i.e.
          <literal>enp0s3</literal> to
          <literal>ens3</literal>.</emphasis>
        </para>
        <para>
          This is due to a kernel configuration change. The new naming
          is consistent with those of other Linux distributions with
          systemd. See
          <link xlink:href="https://github.com/NixOS/nixpkgs/issues/29197">#29197</link>
          for more information.
        </para>
        <para>
          A machine is affected if the <literal>virt-what</literal> tool
          either returns <literal>qemu</literal> or
          <literal>kvm</literal> <emphasis>and</emphasis> has interface
          names used in any part of its NixOS configuration, in
          particular if a static network configuration with
          <literal>networking.interfaces</literal> is used.
        </para>
        <para>
          Before rebooting affected machines, please ensure:
        </para>
        <itemizedlist>
          <listitem>
            <para>
              Change the interface names in your NixOS configuration.
              The first interface will be called
              <literal>ens3</literal>, the second one
              <literal>ens8</literal> and starting from there
              incremented by 1.
            </para>
          </listitem>
          <listitem>
            <para>
              After changing the interface names, rebuild your system
              with <literal>nixos-rebuild boot</literal> to activate the
              new configuration after a reboot. If you switch to the new
              configuration right away you might lose network
              connectivity! If using <literal>nixops</literal>, deploy
              with <literal>nixops deploy --force-reboot</literal>.
            </para>
          </listitem>
        </itemizedlist>
      </listitem>
      <listitem>
        <para>
          The following changes apply if the
          <literal>stateVersion</literal> is changed to 17.09 or higher.
          For <literal>stateVersion = &quot;17.03&quot;</literal> or
          lower the old behavior is preserved.
        </para>
        <itemizedlist>
          <listitem>
            <para>
              The <literal>postgres</literal> default version was
              changed from 9.5 to 9.6.
            </para>
          </listitem>
          <listitem>
            <para>
              The <literal>postgres</literal> superuser name has changed
              from <literal>root</literal> to
              <literal>postgres</literal> to more closely follow what
              other Linux distributions are doing.
            </para>
          </listitem>
          <listitem>
            <para>
              The <literal>postgres</literal> default
              <literal>dataDir</literal> has changed from
              <literal>/var/db/postgres</literal> to
              <literal>/var/lib/postgresql/$psqlSchema</literal> where
              $psqlSchema is 9.6 for example.
            </para>
          </listitem>
          <listitem>
            <para>
              The <literal>mysql</literal> default
              <literal>dataDir</literal> has changed from
              <literal>/var/mysql</literal> to
              <literal>/var/lib/mysql</literal>.
            </para>
          </listitem>
          <listitem>
            <para>
              Radicale's default package has changed from 1.x to 2.x.
              Instructions to migrate can be found
              <link xlink:href="http://radicale.org/1to2/"> here
              </link>. It is also possible to use the newer version by
              setting the <literal>package</literal> to
              <literal>radicale2</literal>, which is done automatically
              when <literal>stateVersion</literal> is 17.09 or higher.
              The <literal>extraArgs</literal> option has been added to
              allow passing the data migration arguments specified in
              the instructions; see the <literal>radicale.nix</literal>
              NixOS test for an example migration.
            </para>
          </listitem>
        </itemizedlist>
      </listitem>
      <listitem>
        <para>
          The <literal>aiccu</literal> package was removed. This is due
          to SixXS <link xlink:href="https://www.sixxs.net/main/">
          sunsetting</link> its IPv6 tunnel.
        </para>
      </listitem>
      <listitem>
        <para>
          The <literal>fanctl</literal> package and
          <literal>fan</literal> module have been removed due to the
          developers not upstreaming their iproute2 patches and lagging
          with compatibility to recent iproute2 versions.
        </para>
      </listitem>
      <listitem>
        <para>
          Top-level <literal>idea</literal> package collection was
          renamed. All JetBrains IDEs are now at
          <literal>jetbrains</literal>.
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>flexget</literal>'s state database cannot be upgraded
          to its new internal format, requiring removal of any existing
          <literal>db-config.sqlite</literal> which will be
          automatically recreated.
        </para>
      </listitem>
      <listitem>
        <para>
          The <literal>ipfs</literal> service now doesn't ignore the
          <literal>dataDir</literal> 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
        </para>
        <programlisting>
dataDir=&lt;valueOfDataDir&gt;
mv /var/lib/ipfs/.ipfs/* $dataDir
rmdir /var/lib/ipfs/.ipfs
</programlisting>
      </listitem>
      <listitem>
        <para>
          The <literal>caddy</literal> service was previously using an
          extra <literal>.caddy</literal> directory in the data
          directory specified with the <literal>dataDir</literal>
          option. The contents of the <literal>.caddy</literal>
          directory are now expected to be in the
          <literal>dataDir</literal>.
        </para>
      </listitem>
      <listitem>
        <para>
          The <literal>ssh-agent</literal> user service is not started
          by default anymore. Use
          <literal>programs.ssh.startAgent</literal> to enable it if
          needed. There is also a new
          <literal>programs.gnupg.agent</literal> module that creates a
          <literal>gpg-agent</literal> user service. It can also serve
          as a SSH agent if <literal>enableSSHSupport</literal> is set.
        </para>
      </listitem>
      <listitem>
        <para>
          The
          <literal>services.tinc.networks.&lt;name&gt;.listenAddress</literal>
          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
          <literal>services.tinc.networks.&lt;name&gt;.bindToAddress</literal>
          instead. Refer to the description of the options for more
          details.
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>tlsdate</literal> package and module were removed.
          This is due to the project being dead and not building with
          openssl 1.1.
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>wvdial</literal> package and module were removed.
          This is due to the project being dead and not building with
          openssl 1.1.
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>cc-wrapper</literal>'s setup-hook now exports a
          number of environment variables corresponding to binutils
          binaries, (e.g. <literal>LD</literal>,
          <literal>STRIP</literal>, <literal>RANLIB</literal>, 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.
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services.firefox.syncserver</literal> 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.
        </para>
      </listitem>
      <listitem>
        <para>
          The <literal>compiz</literal> window manager and package was
          removed. The system support had been broken for several years.
        </para>
      </listitem>
      <listitem>
        <para>
          Touchpad support should now be enabled through
          <literal>libinput</literal> as <literal>synaptics</literal> is
          now deprecated. See the option
          <literal>services.xserver.libinput.enable</literal>.
        </para>
      </listitem>
      <listitem>
        <para>
          grsecurity/PaX support has been dropped, following upstream's
          decision to cease free support. See
          <link xlink:href="https://grsecurity.net/passing_the_baton.php">
          upstream's announcement</link> for more information. No
          complete replacement for grsecurity/PaX is available
          presently.
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services.mysql</literal> now has declarative
          configuration of databases and users with the
          <literal>ensureDatabases</literal> and
          <literal>ensureUsers</literal> options.
        </para>
        <para>
          These options will never delete existing databases and users,
          especially not when the value of the options are changed.
        </para>
        <para>
          The MySQL users will be identified using
          <link xlink:href="https://mariadb.com/kb/en/library/authentication-plugin-unix-socket/">
          Unix socket authentication</link>. This authenticates the Unix
          user with the same name only, and that without the need for a
          password.
        </para>
        <para>
          If you have previously created a MySQL <literal>root</literal>
          user <emphasis>with a password</emphasis>, you will need to
          add <literal>root</literal> user for unix socket
          authentication before using the new options. This can be done
          by running the following SQL script:
        </para>
        <programlisting language="SQL">
CREATE USER 'root'@'%' IDENTIFIED BY '';
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;
FLUSH PRIVILEGES;

-- Optionally, delete the password-authenticated user:
-- DROP USER 'root'@'localhost';
</programlisting>
      </listitem>
      <listitem>
        <para>
          <literal>services.mysqlBackup</literal> now works by default
          without any user setup, including for users other than
          <literal>mysql</literal>.
        </para>
        <para>
          By default, the <literal>mysql</literal> user is no longer the
          user which performs the backup. Instead a system account
          <literal>mysqlbackup</literal> is used.
        </para>
        <para>
          The <literal>mysqlBackup</literal> service is also now using
          systemd timers instead of <literal>cron</literal>.
        </para>
        <para>
          Therefore, the <literal>services.mysqlBackup.period</literal>
          option no longer exists, and has been replaced with
          <literal>services.mysqlBackup.calendar</literal>, which is in
          the format of
          <link xlink:href="https://www.freedesktop.org/software/systemd/man/systemd.time.html#Calendar%20Events">systemd.time(7)</link>.
        </para>
        <para>
          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.
        </para>
        <para>
          You can check that backups still work by running
          <literal>systemctl start mysql-backup</literal> then
          <literal>systemctl status mysql-backup</literal>.
        </para>
      </listitem>
      <listitem>
        <para>
          Templated systemd services e.g
          <literal>container@name</literal> are now handled currectly
          when switching to a new configuration, resulting in them being
          reloaded.
        </para>
      </listitem>
      <listitem>
        <para>
          Steam: the <literal>newStdcpp</literal> parameter was removed
          and should not be needed anymore.
        </para>
      </listitem>
      <listitem>
        <para>
          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.
        </para>
      </listitem>
    </itemizedlist>
  </section>
  <section xml:id="sec-release-17.09-notable-changes">
    <title>Other Notable Changes</title>
    <itemizedlist>
      <listitem>
        <para>
          Modules can now be disabled by using
          <link xlink:href="https://nixos.org/nixpkgs/manual/#sec-replace-modules">
          disabledModules</link>, 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.
        </para>
      </listitem>
      <listitem>
        <para>
          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.
        </para>
      </listitem>
      <listitem>
        <para>
          ZFS/SPL have been updated to 0.7.0,
          <literal>zfsUnstable, splUnstable</literal> have therefore
          been removed.
        </para>
      </listitem>
      <listitem>
        <para>
          The <literal>time.timeZone</literal> option now allows the
          value <literal>null</literal> in addition to timezone strings.
          This value allows changing the timezone of a system
          imperatively using
          <literal>timedatectl set-timezone</literal>. The default
          timezone is still UTC.
        </para>
      </listitem>
      <listitem>
        <para>
          Nixpkgs overlays may now be specified with a file as well as a
          directory. The value of
          <literal>&lt;nixpkgs-overlays&gt;</literal> may be a file, and
          <literal>~/.config/nixpkgs/overlays.nix</literal> can be used
          instead of the <literal>~/.config/nixpkgs/overlays</literal>
          directory.
        </para>
        <para>
          See the overlays chapter of the Nixpkgs manual for more
          details.
        </para>
      </listitem>
      <listitem>
        <para>
          Definitions for <literal>/etc/hosts</literal> can now be
          specified declaratively with
          <literal>networking.hosts</literal>.
        </para>
      </listitem>
      <listitem>
        <para>
          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.
        </para>
        <para>
          This therefore leads to adding a new <literal>debug</literal>
          option to set the log level to the previous verbose mode, to
          make debugging easier, but still accessible easily.
        </para>
        <para>
          Additionally a <literal>copytoram</literal> 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.
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services.gitlab-runner.configOptions</literal> has
          been added to specify the configuration of gitlab-runners
          declaratively.
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services.jenkins.plugins</literal> has been added to
          install plugins easily, this can be generated with
          jenkinsPlugins2nix.
        </para>
      </listitem>
      <listitem>
        <para>
          <literal>services.postfix.config</literal> has been added to
          specify the main.cf with NixOS options. Additionally other
          options have been added to the postfix module and has been
          improved further.
        </para>
      </listitem>
      <listitem>
        <para>
          The GitLab package and module have been updated to the latest
          10.0 release.
        </para>
      </listitem>
      <listitem>
        <para>
          The <literal>systemd-boot</literal> boot loader now lists the
          NixOS version, kernel version and build date of all bootable
          generations.
        </para>
      </listitem>
      <listitem>
        <para>
          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
          <literal>services.dnscrypt-proxy.resolverName</literal> option
          or setting it to <literal>&quot;random&quot;</literal>.
        </para>
      </listitem>
    </itemizedlist>
  </section>
</section>
