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+<section xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xmlns:xi="http://www.w3.org/2001/XInclude"
+         version="5.0"
+         xml:id="sec-release-18.09">
+ <title>Release 18.09 (“Jellyfish”, 2018/10/05)</title>
+
+ <section xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xmlns:xi="http://www.w3.org/2001/XInclude"
+         version="5.0"
+         xml:id="sec-release-18.09-highlights">
+  <title>Highlights</title>
+
+  <para>
+   In addition to numerous new and upgraded packages, this release has the
+   following notable updates:
+  </para>
+
+  <itemizedlist>
+   <listitem>
+    <para>
+     End of support is planned for end of April 2019, handing over to 19.03.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     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.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     Nix has been updated to 2.1; see its
+     <link xlink:href="https://nixos.org/nix/manual/#ssec-relnotes-2.1">release
+     notes</link>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     Core versions: linux: 4.14 LTS (unchanged), glibc: 2.26 → 2.27, gcc: 7
+     (unchanged), systemd: 237 → 239.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     Desktop version changes: gnome: 3.26 → 3.28, (KDE) plasma-desktop: 5.12
+     → 5.13.
+    </para>
+   </listitem>
+  </itemizedlist>
+
+  <para>
+   Notable changes and additions for 18.09 include:
+  </para>
+
+  <itemizedlist>
+   <listitem>
+    <para>
+     Support for wrapping binaries using <literal>firejail</literal> has been
+     added through <varname>programs.firejail.wrappedBinaries</varname>.
+    </para>
+    <para>
+     For example
+    </para>
+<programlisting>
+programs.firejail = {
+  enable = true;
+  wrappedBinaries = {
+    firefox = "${lib.getBin pkgs.firefox}/bin/firefox";
+    mpv = "${lib.getBin pkgs.mpv}/bin/mpv";
+  };
+};
+</programlisting>
+    <para>
+     This will place <literal>firefox</literal> and <literal>mpv</literal>
+     binaries in the global path wrapped by firejail.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     User channels are now in the default <literal>NIX_PATH</literal>, allowing
+     users to use their personal <command>nix-channel</command> defined
+     channels in <command>nix-build</command> and <command>nix-shell</command>
+     commands, as well as in imports like <code>import
+     &lt;mychannel&gt;</code>.
+    </para>
+    <para>
+     For example
+    </para>
+<programlisting>
+$ nix-channel --add https://nixos.org/channels/nixpkgs-unstable nixpkgsunstable
+$ nix-channel --update
+$ nix-build '&lt;nixpkgsunstable&gt;' -A gitFull
+$ nix run -f '&lt;nixpkgsunstable&gt;' gitFull
+$ nix-instantiate -E '(import &lt;nixpkgsunstable&gt; {}).gitFull'
+</programlisting>
+   </listitem>
+  </itemizedlist>
+ </section>
+
+ <section xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xmlns:xi="http://www.w3.org/2001/XInclude"
+         version="5.0"
+         xml:id="sec-release-18.09-new-services">
+  <title>New Services</title>
+
+  <para>
+   A curated selection of new services that were added since the last release:
+  </para>
+
+  <itemizedlist>
+   <listitem>
+    <para>
+     The <varname>services.cassandra</varname> 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
+     <link
+     xlink:href="https://cassandra.apache.org/">Apache
+     Cassandra</link>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     There is a new <varname>services.foundationdb</varname> module for
+     deploying
+     <link xlink:href="https://www.foundationdb.org">FoundationDB</link>
+     clusters.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     When enabled the <literal>iproute2</literal> will copy the files expected
+     by ip route (e.g., <filename>rt_tables</filename>) in
+     <filename>/etc/iproute2</filename>. This allows to write aliases for
+     routing tables for instance.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <varname>services.strongswan-swanctl</varname> is a modern replacement for
+     <varname>services.strongswan</varname>. You can use either one of them to
+     setup IPsec VPNs but not both at the same time.
+    </para>
+    <para>
+     <varname>services.strongswan-swanctl</varname> uses the
+     <link xlink:href="https://wiki.strongswan.org/projects/strongswan/wiki/swanctl">swanctl</link>
+     command which uses the modern
+     <link xlink:href="https://github.com/strongswan/strongswan/blob/master/src/libcharon/plugins/vici/README.md">vici</link>
+     <emphasis>Versatile IKE Configuration Interface</emphasis>. The deprecated
+     <literal>ipsec</literal> command used in
+     <varname>services.strongswan</varname> is using the legacy
+     <link xlink:href="https://github.com/strongswan/strongswan/blob/master/README_LEGACY.md">stroke
+     configuration interface</link>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The new <varname>services.elasticsearch-curator</varname> service
+     periodically curates or manages, your Elasticsearch indices and snapshots.
+    </para>
+   </listitem>
+  </itemizedlist>
+
+  <para>
+   Every new services:
+  </para>
+
+  <itemizedlist>
+   <listitem>
+    <para>
+     <literal>./config/xdg/autostart.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./config/xdg/icons.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./config/xdg/menus.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./config/xdg/mime.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./hardware/brightnessctl.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./hardware/onlykey.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./hardware/video/uvcvideo/default.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./misc/documentation.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./programs/firejail.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./programs/iftop.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./programs/sedutil.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./programs/singularity.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./programs/xss-lock.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./programs/zsh/zsh-autosuggestions.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/admin/oxidized.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/backup/duplicati.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/backup/restic.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/backup/restic-rest-server.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/cluster/hadoop/default.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/databases/aerospike.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/databases/monetdb.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/desktops/bamf.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/desktops/flatpak.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/desktops/zeitgeist.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/development/bloop.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/development/jupyter/default.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/hardware/lcd.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/hardware/undervolt.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/misc/clipmenu.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/misc/gitweb.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/misc/serviio.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/misc/safeeyes.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/misc/sysprof.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/misc/weechat.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/monitoring/datadog-agent.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/monitoring/incron.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/networking/dnsdist.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/networking/freeradius.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/networking/hans.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/networking/morty.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/networking/ndppd.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/networking/ocserv.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/networking/owamp.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/networking/quagga.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/networking/shadowsocks.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/networking/stubby.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/networking/zeronet.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/security/certmgr.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/security/cfssl.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/security/oauth2_proxy_nginx.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/web-apps/virtlyst.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/web-apps/youtrack.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/web-servers/hitch/default.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/web-servers/hydron.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/web-servers/meguca.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./services/web-servers/nginx/gitweb.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./virtualisation/kvmgt.nix</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>./virtualisation/qemu-guest-agent.nix</literal>
+    </para>
+   </listitem>
+  </itemizedlist>
+ </section>
+
+ <section xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xmlns:xi="http://www.w3.org/2001/XInclude"
+         version="5.0"
+         xml:id="sec-release-18.09-incompatibilities">
+  <title>Backward Incompatibilities</title>
+
+  <para>
+   When upgrading from a previous release, please be aware of the following
+   incompatible changes:
+  </para>
+
+  <itemizedlist>
+   <listitem>
+    <para>
+     Some licenses that were incorrectly not marked as unfree now are. This is
+     the case for:
+     <itemizedlist>
+      <listitem>
+       <para>
+        cc-by-nc-sa-20: Creative Commons Attribution Non Commercial Share Alike
+        2.0
+       </para>
+      </listitem>
+      <listitem>
+       <para>
+        cc-by-nc-sa-25: Creative Commons Attribution Non Commercial Share Alike
+        2.5
+       </para>
+      </listitem>
+      <listitem>
+       <para>
+        cc-by-nc-sa-30: Creative Commons Attribution Non Commercial Share Alike
+        3.0
+       </para>
+      </listitem>
+      <listitem>
+       <para>
+        cc-by-nc-sa-40: Creative Commons Attribution Non Commercial Share Alike
+        4.0
+       </para>
+      </listitem>
+      <listitem>
+       <para>
+        cc-by-nd-30: Creative Commons Attribution-No Derivative Works v3.00
+       </para>
+      </listitem>
+      <listitem>
+       <para>
+        msrla: Microsoft Research License Agreement
+       </para>
+      </listitem>
+     </itemizedlist>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The deprecated <varname>services.cassandra</varname> module has seen a
+     complete rewrite. (See above.)
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>lib.strict</literal> is removed. Use
+     <literal>builtins.seq</literal> instead.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The <literal>clementine</literal> package points now to the free
+     derivation. <literal>clementineFree</literal> is removed now and
+     <literal>clementineUnfree</literal> points to the package which is bundled
+     with the unfree <literal>libspotify</literal> package.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The <literal>netcat</literal> package is now taken directly from OpenBSD's
+     <literal>libressl</literal>, 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.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The <varname>services.docker-registry.extraConfig</varname> 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
+     <link xlink:href="https://github.com/docker/distribution/blob/v2.6.2/docs/configuration.md">the
+     <varname>docker/distribution</varname> docs</link>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>gnucash</literal> has changed from version 2.4 to 3.x. If you've
+     been using <literal>gnucash</literal> (version 2.4) instead of
+     <literal>gnucash26</literal> (version 2.6) you must open your Gnucash data
+     file(s) with <literal>gnucash26</literal> and then save them to upgrade
+     the file format. Then you may use your data file(s) with Gnucash 3.x. See
+     the upgrade
+     <link xlink:href="https://wiki.gnucash.org/wiki/FAQ#Using_Different_Versions.2C_Up_And_Downgrade">documentation</link>.
+     Gnucash 2.4 is still available under the attribute
+     <literal>gnucash24</literal>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <varname>services.munge</varname> now runs as user (and group)
+     <literal>munge</literal> instead of root. Make sure the key file is
+     accessible to the daemon.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <varname>dockerTools.buildImage</varname> now uses <literal>null</literal>
+     as default value for <varname>tag</varname>, which indicates that the nix
+     output hash will be used as tag.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The ELK stack: <varname>elasticsearch</varname>,
+     <varname>logstash</varname> and <varname>kibana</varname> has been
+     upgraded from 2.* to 6.3.*. The 2.* versions have been
+     <link xlink:href="https://www.elastic.co/support/eol">unsupported since
+     last year</link> so they have been removed. You can still use the 5.*
+     versions under the names <varname>elasticsearch5</varname>,
+     <varname>logstash5</varname> and <varname>kibana5</varname>.
+    </para>
+    <para>
+     The elastic beats: <varname>filebeat</varname>,
+     <varname>heartbeat</varname>, <varname>metricbeat</varname> and
+     <varname>packetbeat</varname> have had the same treatment: they now target
+     6.3.* as well. The 5.* versions are available under the names:
+     <varname>filebeat5</varname>, <varname>heartbeat5</varname>,
+     <varname>metricbeat5</varname> and <varname>packetbeat5</varname>
+    </para>
+    <para>
+     The ELK-6.3 stack now comes with
+     <link xlink:href="https://www.elastic.co/products/x-pack/open">X-Pack by
+     default</link>. Since X-Pack is licensed under the
+     <link xlink:href="https://github.com/elastic/elasticsearch/blob/master/licenses/ELASTIC-LICENSE.txt">Elastic
+     License</link> the ELK packages now have an unfree license. To use them
+     you need to specify <literal>allowUnfree = true;</literal> in your nixpkgs
+     configuration.
+    </para>
+    <para>
+     Fortunately there is also a free variant of the ELK stack without X-Pack.
+     The packages are available under the names:
+     <varname>elasticsearch-oss</varname>, <varname>logstash-oss</varname> and
+     <varname>kibana-oss</varname>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     Options
+     <literal>boot.initrd.luks.devices.<replaceable>name</replaceable>.yubikey.ramfsMountPoint</literal>
+     <literal>boot.initrd.luks.devices.<replaceable>name</replaceable>.yubikey.storage.mountPoint</literal>
+     were removed. <literal>luksroot.nix</literal> 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.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>stdenv.system</literal> and <literal>system</literal> 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 <literal>stdenv.buildPlatform.system</literal>
+     can be used instead for the old behavior. They should be using that
+     anyways for clarity.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     Groups <literal>kvm</literal> and <literal>render</literal> are introduced
+     now, as systemd requires them.
+    </para>
+   </listitem>
+  </itemizedlist>
+ </section>
+
+ <section xmlns="http://docbook.org/ns/docbook"
+         xmlns:xlink="http://www.w3.org/1999/xlink"
+         xmlns:xi="http://www.w3.org/2001/XInclude"
+         version="5.0"
+         xml:id="sec-release-18.09-notable-changes">
+  <title>Other Notable Changes</title>
+
+  <itemizedlist>
+   <listitem>
+    <para>
+     <literal>dockerTools.pullImage</literal> relies on image digest instead of
+     image tag to download the image. The <literal>sha256</literal> of a pulled
+     image has to be updated.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>lib.attrNamesToStr</literal> has been deprecated. Use more
+     specific concatenation (<literal>lib.concat(Map)StringsSep</literal>)
+     instead.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>lib.addErrorContextToAttrs</literal> has been deprecated. Use
+     <literal>builtins.addErrorContext</literal> directly.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>lib.showVal</literal> has been deprecated. Use
+     <literal>lib.traceSeqN</literal> instead.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>lib.traceXMLVal</literal> has been deprecated. Use
+     <literal>lib.traceValFn builtins.toXml</literal> instead.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>lib.traceXMLValMarked</literal> has been deprecated. Use
+     <literal>lib.traceValFn (x: str + builtins.toXML x)</literal> instead.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The <literal>pkgs</literal> argument to NixOS modules can now be set
+     directly using <literal>nixpkgs.pkgs</literal>. Previously, only the
+     <literal>system</literal>, <literal>config</literal> and
+     <literal>overlays</literal> arguments could be used to influence
+     <literal>pkgs</literal>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     A NixOS system can now be constructed more easily based on a preexisting
+     invocation of Nixpkgs. For example:
+<programlisting>
+inherit (pkgs.nixos {
+  boot.loader.grub.enable = false;
+  fileSystems."/".device = "/dev/xvda1";
+}) toplevel kernel initialRamdisk manual;
+      </programlisting>
+     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.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>lib.traceValIfNot</literal> has been deprecated. Use
+     <literal>if/then/else</literal> and <literal>lib.traceValSeq</literal>
+     instead.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>lib.traceCallXml</literal> has been deprecated. Please complain
+     if you use the function regularly.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The attribute <literal>lib.nixpkgsVersion</literal> has been deprecated in
+     favor of <literal>lib.version</literal>. Please refer to the discussion in
+     <link xlink:href="https://github.com/NixOS/nixpkgs/pull/39416#discussion_r183845745">NixOS/nixpkgs#39416</link>
+     for further reference.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>lib.recursiveUpdateUntil</literal> was not acting according to
+     its specification. It has been fixed to act according to the docstring,
+     and a test has been added.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The module for <option>security.dhparams</option> has two new options now:
+    </para>
+    <variablelist>
+     <varlistentry>
+      <term>
+       <option>security.dhparams.stateless</option>
+      </term>
+      <listitem>
+       <para>
+        Puts the generated Diffie-Hellman parameters into the Nix store instead
+        of managing them in a stateful manner in
+        <filename class="directory">/var/lib/dhparams</filename>.
+       </para>
+      </listitem>
+     </varlistentry>
+     <varlistentry>
+      <term>
+       <option>security.dhparams.defaultBitSize</option>
+      </term>
+      <listitem>
+       <para>
+        The default bit size to use for the generated Diffie-Hellman
+        parameters.
+       </para>
+      </listitem>
+     </varlistentry>
+    </variablelist>
+    <note>
+     <para>
+      The path to the actual generated parameter files should now be queried
+      using
+      <literal>config.security.dhparams.params.<replaceable>name</replaceable>.path</literal>
+      because it might be either in the Nix store or in a directory configured
+      by <option>security.dhparams.path</option>.
+     </para>
+    </note>
+    <note>
+     <title>For developers:</title>
+     <para>
+      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).
+     </para>
+     <para>
+      An example usage of this would be:
+<programlisting>
+{ config, ... }:
+
+{
+  security.dhparams.params.myservice = {};
+  environment.etc."myservice.conf".text = ''
+    dhparams = ${config.security.dhparams.params.myservice.path}
+  '';
+}
+</programlisting>
+     </para>
+    </note>
+   </listitem>
+   <listitem>
+    <para>
+     <literal>networking.networkmanager.useDnsmasq</literal> has been
+     deprecated. Use <literal>networking.networkmanager.dns</literal> instead.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The Kubernetes package has been bumped to major version 1.11. Please
+     consult the
+     <link xlink:href="https://github.com/kubernetes/kubernetes/blob/release-1.11/CHANGELOG-1.11.md">release
+     notes</link> for details on new features and api changes.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The option
+     <varname>services.kubernetes.apiserver.admissionControl</varname> was
+     renamed to
+     <varname>services.kubernetes.apiserver.enableAdmissionPlugins</varname>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     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.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The option <varname>services.kubernetes.apiserver.address</varname> was
+     renamed to <varname>services.kubernetes.apiserver.bindAddress</varname>.
+     Note that the default value has changed from 127.0.0.1 to 0.0.0.0.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The option <varname>services.kubernetes.apiserver.publicAddress</varname>
+     was not used and thus has been removed.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The option
+     <varname>services.kubernetes.addons.dashboard.enableRBAC</varname> was
+     renamed to
+     <varname>services.kubernetes.addons.dashboard.rbac.enable</varname>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The Kubernetes Dashboard now has only minimal RBAC permissions by default.
+     If dashboard cluster-admin rights are desired, set
+     <varname>services.kubernetes.addons.dashboard.rbac.clusterAdmin</varname>
+     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: <literal>kubectl delete clusterrolebinding
+     kubernetes-dashboard</literal>
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The <varname>programs.screen</varname> module provides allows to configure
+     <literal>/etc/screenrc</literal>, however the module behaved fairly
+     counterintuitive as the config exists, but the package wasn't available.
+     Since 18.09 <literal>pkgs.screen</literal> will be added to
+     <literal>environment.systemPackages</literal>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The module <option>services.networking.hostapd</option> now uses WPA2 by
+     default.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     <varname>s6Dns</varname>, <varname>s6Networking</varname>,
+     <varname>s6LinuxUtils</varname> and <varname>s6PortableUtils</varname>
+     renamed to <varname>s6-dns</varname>, <varname>s6-networking</varname>,
+     <varname>s6-linux-utils</varname> and <varname>s6-portable-utils</varname>
+     respectively.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The module option <option>nix.useSandbox</option> is now defaulted to
+     <literal>true</literal>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The config activation script of <literal>nixos-rebuild</literal> now
+     <link xlink:href="https://www.freedesktop.org/software/systemd/man/systemctl.html#Manager%20Lifecycle%20Commands">reloads</link>
+     all user units for each authenticated user.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     The default display manager is now LightDM. To use SLiM set
+     <literal>services.xserver.displayManager.slim.enable</literal> to
+     <literal>true</literal>.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     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 <code>&lt;/para&gt;&lt;para&gt;</code> to start a
+     new paragraph.
+    </para>
+   </listitem>
+   <listitem>
+    <para>
+     Top-level <literal>buildPlatform</literal>,
+     <literal>hostPlatform</literal>, and <literal>targetPlatform</literal> in
+     Nixpkgs are deprecated. Please use their equivalents in
+     <literal>stdenv</literal> instead:
+     <literal>stdenv.buildPlatform</literal>,
+     <literal>stdenv.hostPlatform</literal>, and
+     <literal>stdenv.targetPlatform</literal>.
+    </para>
+   </listitem>
+  </itemizedlist>
+ </section>
+</section>