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<h1>Full-Text Search</h1>
<h2 id="overview"><a class="toclink" href="#overview">Overview</a></h2>
<p>Full-text search allows all messages to be indexed, so that mail clients can quickly and efficiently search messages by their full text content. Dovecot supports a variety of community supported <a href="https://doc.dovecot.org/configuration_manual/fts/">FTS indexing backends</a>.</p>
<p>Docker-mailserver comes pre-installed with two plugins that can be enabled with a dovecot config file.</p>
<p>Please be aware that indexing consumes memory and takes up additional disk space.</p>
<h3 id="xapian"><a class="toclink" href="#xapian">Xapian</a></h3>
<p>The <a href="https://github.com/grosjo/fts-xapian">dovecot-fts-xapian</a> plugin makes use of <a href="https://xapian.org/">Xapian</a>. Xapian enables embedding an FTS engine without the need for additional backends.</p>
<p>The indexes will be stored as a subfolder named <code>xapian-indexes</code> inside your <code>mail</code> folder. With the default settings, 10GB of email data may generate around 4GB of indexed data.</p>
<p>While indexing is memory intensive, you can configure the plugin to limit the amount of memory consumed by the index workers. With Xapian being small and fast, this plugin is a good choice for low memory environments (2GB) as compared to Solr.</p>
<h4 id="setup"><a class="toclink" href="#setup">Setup</a></h4>
<ol>
<li>
<p>To configure fts-xapian as a dovecot plugin, create a <code>fts-xapian-plugin.conf</code> file and place the following in it:</p>
<div class="highlight"><pre><span></span><code>mail_plugins = $mail_plugins fts fts_xapian
plugin {
fts = xapian
fts_xapian = partial=3 full=20 verbose=0
fts_autoindex = yes
fts_enforced = yes
# disable indexing of folders
# fts_autoindex_exclude = \Trash
# Index attachements
# fts_decoder = decode2text
}
service indexer-worker {
# limit size of indexer-worker RAM usage, ex: 512MB, 1GB, 2GB
vsz_limit = 1GB
}
# service decode2text {
# executable = script /usr/libexec/dovecot/decode2text.sh
# user = dovecot
# unix_listener decode2text {
# mode = 0666
# }
# }
</code></pre></div>
<p>adjust the settings to tune for your desired memory limits, exclude folders and enable searching text inside of attachments</p>
</li>
<li>
<p>Update <code>docker-compose.yml</code> to load the previously created dovecot plugin config file:</p>
<div class="highlight"><pre><span></span><code> <span class="nt">version</span><span class="p">:</span> <span class="s">&#39;3.8&#39;</span>
<span class="nt">services</span><span class="p">:</span>
<span class="nt">mailserver</span><span class="p">:</span>
<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">mailserver/docker-mailserver:latest</span>
<span class="nt">hostname</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">mail</span>
<span class="nt">domainname</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">example.com</span>
<span class="nt">container_name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">mailserver</span>
<span class="nt">env_file</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">mailserver.env</span>
<span class="nt">ports</span><span class="p">:</span>
<span class="p p-Indicator">-</span> <span class="s">&quot;25:25&quot;</span> <span class="c1"># SMTP (explicit TLS =&gt; STARTTLS)</span>
<span class="p p-Indicator">-</span> <span class="s">&quot;143:143&quot;</span> <span class="c1"># IMAP4 (explicit TLS =&gt; STARTTLS)</span>
<span class="p p-Indicator">-</span> <span class="s">&quot;465:465&quot;</span> <span class="c1"># ESMTP (implicit TLS)</span>
<span class="p p-Indicator">-</span> <span class="s">&quot;587:587&quot;</span> <span class="c1"># ESMTP (explicit TLS =&gt; STARTTLS)</span>
<span class="p p-Indicator">-</span> <span class="s">&quot;993:993&quot;</span> <span class="c1"># IMAP4 (implicit TLS)</span>
<span class="nt">volumes</span><span class="p">:</span>
<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">./data/mail:/var/mail</span>
<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">./data/state:/var/mail-state</span>
<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">./data/logs:/var/log/mail</span>
<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">/etc/localtime:/etc/localtime:ro</span>
<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">./config/:/tmp/docker-mailserver/</span>
<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">./fts-xapian-plugin.conf:/etc/dovecot/conf.d/10-plugin.conf:ro</span>
<span class="nt">restart</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">always</span>
<span class="nt">stop_grace_period</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">1m</span>
<span class="nt">cap_add</span><span class="p">:</span> <span class="p p-Indicator">[</span> <span class="s">&quot;NET_ADMIN&quot;</span><span class="p p-Indicator">,</span> <span class="s">&quot;SYS_PTRACE&quot;</span> <span class="p p-Indicator">]</span>
</code></pre></div>
</li>
<li>
<p>Recreate containers: </p>
<div class="highlight"><pre><span></span><code> docker-compose down
docker-compose up -d
</code></pre></div>
</li>
<li>
<p>Initialize indexing on all users for all mail:</p>
<div class="highlight"><pre><span></span><code> docker-compose exec mailserver doveadm index -A -q \*
</code></pre></div>
</li>
<li>
<p>Run the following command in a daily cron job:</p>
<div class="highlight"><pre><span></span><code> docker-compose exec mailserver doveadm fts optimize -A
</code></pre></div>
</li>
</ol>
<h3 id="solr"><a class="toclink" href="#solr">Solr</a></h3>
<p>The <a href="https://wiki2.dovecot.org/Plugins/FTS/Solr">dovecot-solr Plugin</a> is used in conjunction with <a href="https://lucene.apache.org/solr/">Apache Solr</a> running in a separate container. This is quite straightforward to setup using the following instructions.</p>
<p>Solr is a mature and fast indexing backend that runs on the JVM. The indexes are relatively compact compared to the size of your total email. </p>
<p>However, Solr also requires a fair bit of RAM. While Solr is <a href="https://solr.apache.org/guide/7_0/query-settings-in-solrconfig.html">highly tuneable</a>, it may require a bit of testing to get it right.</p>
<h4 id="setup_1"><a class="toclink" href="#setup_1">Setup</a></h4>
<ol>
<li>
<p><code>docker-compose.yml</code>:</p>
<div class="highlight"><pre><span></span><code> <span class="nt">solr</span><span class="p">:</span>
<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">lmmdock/dovecot-solr:latest</span>
<span class="nt">volumes</span><span class="p">:</span>
<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">solr-dovecot:/opt/solr/server/solr/dovecot</span>
<span class="nt">restart</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">always</span>
<span class="nt">mailserver</span><span class="p">:</span>
<span class="nt">depends_on</span><span class="p">:</span>
<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">solr</span>
<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">mailserver/docker-mailserver:latest</span>
<span class="l l-Scalar l-Scalar-Plain">...</span>
<span class="nt">volumes</span><span class="p">:</span>
<span class="l l-Scalar l-Scalar-Plain">...</span>
<span class="l l-Scalar l-Scalar-Plain">- ./etc/dovecot/conf.d/10-plugin.conf:/etc/dovecot/conf.d/10-plugin.conf:ro</span>
<span class="l l-Scalar l-Scalar-Plain">...</span>
<span class="nt">volumes</span><span class="p">:</span>
<span class="nt">solr-dovecot</span><span class="p">:</span>
<span class="nt">driver</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">local</span>
</code></pre></div>
</li>
<li>
<p><code>etc/dovecot/conf.d/10-plugin.conf</code>:</p>
<div class="highlight"><pre><span></span><code><span class="na">mail_plugins</span> <span class="o">=</span> <span class="s">$mail_plugins fts fts_solr</span>
<span class="na">plugin {</span>
<span class="na">fts</span> <span class="o">=</span> <span class="s">solr</span>
<span class="na">fts_autoindex</span> <span class="o">=</span> <span class="s">yes</span>
<span class="na">fts_solr</span> <span class="o">=</span> <span class="s">url=http://solr:8983/solr/dovecot/ </span>
<span class="na">}</span>
</code></pre></div>
</li>
<li>
<p>Recreate containers: <code>docker-compose down ; docker-compose up -d</code></p>
</li>
<li>
<p>Flag all user mailbox FTS indexes as invalid, so they are rescanned on demand when they are next searched: <code>docker-compose exec mailserver doveadm fts rescan -A</code></p>
</li>
</ol>
<h4 id="further-discussion"><a class="toclink" href="#further-discussion">Further Discussion</a></h4>
<p>See <a href="https://github.com/docker-mailserver/docker-mailserver/issues/905">#905</a></p>
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