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+<chapter 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="module-postgresql">
+ <title>PostgreSQL</title>
+<!-- FIXME: render nicely -->
+<!-- FIXME: source can be added automatically -->
+ <para>
+  <emphasis>Source:</emphasis>
+  <filename>modules/services/databases/postgresql.nix</filename>
+ </para>
+ <para>
+  <emphasis>Upstream documentation:</emphasis>
+  <link xlink:href="http://www.postgresql.org/docs/"/>
+ </para>
+<!-- FIXME: more stuff, like maintainer? -->
+ <para>
+  PostgreSQL is an advanced, free relational database.
+<!-- MORE -->
+ </para>
+ <section xml:id="module-services-postgres-configuring">
+  <title>Configuring</title>
+
+  <para>
+   To enable PostgreSQL, add the following to your
+   <filename>configuration.nix</filename>:
+<programlisting>
+<xref linkend="opt-services.postgresql.enable"/> = true;
+<xref linkend="opt-services.postgresql.package"/> = pkgs.postgresql_9_4;
+</programlisting>
+   Note that you are required to specify the desired version of PostgreSQL
+   (e.g. <literal>pkgs.postgresql_9_4</literal>). Since upgrading your
+   PostgreSQL version requires a database dump and reload (see below), NixOS
+   cannot provide a default value for
+   <xref linkend="opt-services.postgresql.package"/> such as the most recent
+   release of PostgreSQL.
+  </para>
+
+<!--
+<para>After running <command>nixos-rebuild</command>, you can verify
+whether PostgreSQL works by running <command>psql</command>:
+
+<screen>
+$ psql
+psql (9.2.9)
+Type "help" for help.
+
+alice=>
+</screen>
+-->
+
+  <para>
+   By default, PostgreSQL stores its databases in
+   <filename>/var/db/postgresql</filename>. You can override this using
+   <xref linkend="opt-services.postgresql.dataDir"/>, e.g.
+<programlisting>
+<xref linkend="opt-services.postgresql.dataDir"/> = "/data/postgresql";
+</programlisting>
+  </para>
+ </section>
+ <section xml:id="module-services-postgres-upgrading">
+  <title>Upgrading</title>
+
+  <para>
+   FIXME: document dump/upgrade/load cycle.
+  </para>
+ </section>
+ <section xml:id="module-services-postgres-options">
+  <title>Options</title>
+
+  <para>
+   A complete list of options for the PostgreSQL module may be found
+   <link linkend="opt-services.postgresql.enable">here</link>.
+  </para>
+ </section>
+</chapter>