2014-08-27 11:24:10 +01:00
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<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="module-postgresql">
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2018-09-30 01:51:11 +01:00
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<title>PostgreSQL</title>
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2014-08-27 11:24:10 +01:00
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<!-- FIXME: render nicely -->
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<!-- FIXME: source can be added automatically -->
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2018-09-30 01:51:11 +01:00
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<para>
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<emphasis>Source:</emphasis>
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<filename>modules/services/databases/postgresql.nix</filename>
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</para>
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<para>
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<emphasis>Upstream documentation:</emphasis>
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<link xlink:href="http://www.postgresql.org/docs/"/>
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</para>
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2014-08-27 11:24:10 +01:00
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<!-- FIXME: more stuff, like maintainer? -->
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2018-09-30 01:51:11 +01:00
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<para>
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PostgreSQL is an advanced, free relational database.
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<!-- MORE -->
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</para>
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<section xml:id="module-services-postgres-configuring">
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<title>Configuring</title>
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<para>
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To enable PostgreSQL, add the following to your
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<filename>configuration.nix</filename>:
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2014-08-27 11:24:10 +01:00
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<programlisting>
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2018-04-05 09:43:56 +01:00
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<xref linkend="opt-services.postgresql.enable"/> = true;
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2019-07-21 20:05:41 +01:00
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<xref linkend="opt-services.postgresql.package"/> = pkgs.postgresql_11;
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2014-08-27 11:24:10 +01:00
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</programlisting>
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Note that you are required to specify the desired version of PostgreSQL
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(e.g. <literal>pkgs.postgresql_11</literal>). Since upgrading your
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PostgreSQL version requires a database dump and reload (see below), NixOS
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cannot provide a default value for
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2018-09-30 01:51:11 +01:00
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<xref linkend="opt-services.postgresql.package"/> such as the most recent
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release of PostgreSQL.
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</para>
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2014-08-27 11:24:10 +01:00
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<!--
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<para>After running <command>nixos-rebuild</command>, you can verify
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whether PostgreSQL works by running <command>psql</command>:
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<screen>
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2019-06-17 12:25:50 +01:00
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<prompt>$ </prompt>psql
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2014-08-27 11:24:10 +01:00
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psql (9.2.9)
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Type "help" for help.
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2019-06-17 12:25:50 +01:00
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<prompt>alice=></prompt>
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2014-08-27 11:24:10 +01:00
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</screen>
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-->
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2018-09-30 01:51:11 +01:00
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<para>
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By default, PostgreSQL stores its databases in
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<filename>/var/lib/postgresql/$psqlSchema</filename>. You can override this using
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<xref linkend="opt-services.postgresql.dataDir"/>, e.g.
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<programlisting>
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2018-04-05 09:43:56 +01:00
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<xref linkend="opt-services.postgresql.dataDir"/> = "/data/postgresql";
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</programlisting>
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</para>
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</section>
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<section xml:id="module-services-postgres-upgrading">
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<title>Upgrading</title>
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<para>
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FIXME: document dump/upgrade/load cycle.
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</para>
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</section>
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<section xml:id="module-services-postgres-options">
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<title>Options</title>
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<para>
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A complete list of options for the PostgreSQL module may be found
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<link linkend="opt-services.postgresql.enable">here</link>.
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</para>
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</section>
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2019-07-21 20:05:41 +01:00
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<section xml:id="module-services-postgres-plugins">
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<title>Plugins</title>
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<para>
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Plugins collection for each PostgreSQL version can be accessed with
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<literal>.pkgs</literal>. For example, for
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<literal>pkgs.postgresql_11</literal> package, its plugin collection is
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accessed by <literal>pkgs.postgresql_11.pkgs</literal>:
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<screen>
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<prompt>$ </prompt>nix repl '<nixpkgs>'
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Loading '<nixpkgs>'...
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Added 10574 variables.
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<prompt>nix-repl> </prompt>postgresql_11.pkgs.<TAB><TAB>
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postgresql_11.pkgs.cstore_fdw postgresql_11.pkgs.pg_repack
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postgresql_11.pkgs.pg_auto_failover postgresql_11.pkgs.pg_safeupdate
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postgresql_11.pkgs.pg_bigm postgresql_11.pkgs.pg_similarity
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postgresql_11.pkgs.pg_cron postgresql_11.pkgs.pg_topn
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postgresql_11.pkgs.pg_hll postgresql_11.pkgs.pgjwt
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postgresql_11.pkgs.pg_partman postgresql_11.pkgs.pgroonga
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...
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</screen>
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</para>
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<para>
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To add plugins via NixOS configuration, set <literal>services.postgresql.extraPlugins</literal>:
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<programlisting>
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<xref linkend="opt-services.postgresql.package"/> = pkgs.postgresql_11;
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<xref linkend="opt-services.postgresql.extraPlugins"/> = with pkgs.postgresql_11.pkgs; [
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pg_repack
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postgis
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];
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</programlisting>
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</para>
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<para>
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You can build custom PostgreSQL-with-plugins (to be used outside of NixOS) using
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function <literal>.withPackages</literal>. For example, creating a custom
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PostgreSQL package in an overlay can look like:
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<programlisting>
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self: super: {
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postgresql_custom = self.postgresql_11.withPackages (ps: [
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ps.pg_repack
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ps.postgis
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]);
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}
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</programlisting>
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</para>
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<para>
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Here's a recipe on how to override a particular plugin through an overlay:
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<programlisting>
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self: super: {
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postgresql_11 = super.postgresql_11.override { this = self.postgresql_11; } // {
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pkgs = super.postgresql_11.pkgs // {
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pg_repack = super.postgresql_11.pkgs.pg_repack.overrideAttrs (_: {
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name = "pg_repack-v20181024";
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src = self.fetchzip {
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url = "https://github.com/reorg/pg_repack/archive/923fa2f3c709a506e111cc963034bf2fd127aa00.tar.gz";
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sha256 = "17k6hq9xaax87yz79j773qyigm4fwk8z4zh5cyp6z0sxnwfqxxw5";
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};
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});
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};
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};
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}
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</programlisting>
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</para>
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</section>
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2014-08-27 11:24:10 +01:00
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</chapter>
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