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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-services-matomo">
+ <title>Matomo</title>
+ <para>
+  Matomo is a real-time web analytics application. This module configures
+  php-fpm as backend for Matomo, optionally configuring an nginx vhost as well.
+ </para>
+ <para>
+  An automatic setup is not suported by Matomo, so you need to configure Matomo
+  itself in the browser-based Matomo setup.
+ </para>
+ <section xml:id="module-services-matomo-database-setup">
+  <title>Database Setup</title>
+
+  <para>
+   You also need to configure a MariaDB or MySQL database and -user for Matomo
+   yourself, and enter those credentials in your browser. You can use
+   passwordless database authentication via the UNIX_SOCKET authentication
+   plugin with the following SQL commands:
+<programlisting>
+# For MariaDB
+INSTALL PLUGIN unix_socket SONAME 'auth_socket';
+CREATE DATABASE matomo;
+CREATE USER 'matomo'@'localhost' IDENTIFIED WITH unix_socket;
+GRANT ALL PRIVILEGES ON matomo.* TO 'matomo'@'localhost';
+
+# For MySQL
+INSTALL PLUGIN auth_socket SONAME 'auth_socket.so';
+CREATE DATABASE matomo;
+CREATE USER 'matomo'@'localhost' IDENTIFIED WITH auth_socket;
+GRANT ALL PRIVILEGES ON matomo.* TO 'matomo'@'localhost';
+</programlisting>
+   Then fill in <literal>matomo</literal> as database user and database name,
+   and leave the password field blank. This authentication works by allowing
+   only the <literal>matomo</literal> unix user to authenticate as the
+   <literal>matomo</literal> database user (without needing a password), but no
+   other users. For more information on passwordless login, see
+   <link xlink:href="https://mariadb.com/kb/en/mariadb/unix_socket-authentication-plugin/" />.
+  </para>
+
+  <para>
+   Of course, you can use password based authentication as well, e.g. when the
+   database is not on the same host.
+  </para>
+ </section>
+ <section xml:id="module-services-matomo-archive-processing">
+  <title>Archive Processing</title>
+
+  <para>
+   This module comes with the systemd service
+   <literal>matomo-archive-processing.service</literal> and a timer that
+   automatically triggers archive processing every hour. This means that you
+   can safely
+   <link xlink:href="https://matomo.org/docs/setup-auto-archiving/#disable-browser-triggers-for-matomo-archiving-and-limit-matomo-reports-to-updating-every-hour">
+   disable browser triggers for Matomo archiving </link> at
+   <literal>Administration > System > General Settings</literal>.
+  </para>
+
+  <para>
+   With automatic archive processing, you can now also enable to
+   <link xlink:href="https://matomo.org/docs/privacy/#step-2-delete-old-visitors-logs">
+   delete old visitor logs </link> at <literal>Administration > System >
+   Privacy</literal>, but make sure that you run <literal>systemctl start
+   matomo-archive-processing.service</literal> at least once without errors if
+   you have already collected data before, so that the reports get archived
+   before the source data gets deleted.
+  </para>
+ </section>
+ <section xml:id="module-services-matomo-backups">
+  <title>Backup</title>
+
+  <para>
+   You only need to take backups of your MySQL database and the
+   <filename>/var/lib/matomo/config/config.ini.php</filename> file. Use a user
+   in the <literal>matomo</literal> group or root to access the file. For more
+   information, see
+   <link xlink:href="https://matomo.org/faq/how-to-install/faq_138/" />.
+  </para>
+ </section>
+ <section xml:id="module-services-matomo-issues">
+  <title>Issues</title>
+
+  <itemizedlist>
+   <listitem>
+    <para>
+     Matomo will warn you that the JavaScript tracker is not writable. This is
+     because it's located in the read-only nix store. You can safely ignore
+     this, unless you need a plugin that needs JavaScript tracker access.
+    </para>
+   </listitem>
+  </itemizedlist>
+ </section>
+ <section xml:id="module-services-matomo-other-web-servers">
+  <title>Using other Web Servers than nginx</title>
+
+  <para>
+   You can use other web servers by forwarding calls for
+   <filename>index.php</filename> and <filename>piwik.php</filename> to the
+   <literal><link linkend="opt-services.phpfpm.pools._name_.socket">services.phpfpm.pools.&lt;name&gt;.socket</link></literal> fastcgi unix socket. You can use
+   the nginx configuration in the module code as a reference to what else
+   should be configured.
+  </para>
+ </section>
+</chapter>