docker-mailserver/edge/config/advanced/full-text-search/index.html
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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><code>docker-mailserver</code> 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 local <code>mail-data</code> folder (<em><code>/var/mail</code> internally</em>). 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 <code>fts-xapian</code> as a dovecot plugin, create a file at <code>docker-data/dms/config/dovecot/fts-xapian-plugin.conf</code> 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="w"> </span><span class="nt">version</span><span class="p">:</span><span class="w"> </span><span class="s">&#39;3.8&#39;</span><span class="w"></span>
<span class="w"> </span><span class="nt">services</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">mailserver</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">docker.io/mailserver/docker-mailserver:latest</span><span class="w"></span>
<span class="w"> </span><span class="nt">container_name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">mailserver</span><span class="w"></span>
<span class="w"> </span><span class="nt">hostname</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">mail</span><span class="w"></span>
<span class="w"> </span><span class="nt">domainname</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">example.com</span><span class="w"></span>
<span class="w"> </span><span class="nt">env_file</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">mailserver.env</span><span class="w"></span>
<span class="w"> </span><span class="nt">ports</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">&quot;25:25&quot;</span><span class="w"> </span><span class="c1"># SMTP (explicit TLS =&gt; STARTTLS)</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">&quot;143:143&quot;</span><span class="w"> </span><span class="c1"># IMAP4 (explicit TLS =&gt; STARTTLS)</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">&quot;465:465&quot;</span><span class="w"> </span><span class="c1"># ESMTP (implicit TLS)</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">&quot;587:587&quot;</span><span class="w"> </span><span class="c1"># ESMTP (explicit TLS =&gt; STARTTLS)</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">&quot;993:993&quot;</span><span class="w"> </span><span class="c1"># IMAP4 (implicit TLS)</span><span class="w"></span>
<span class="w"> </span><span class="nt">volumes</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/mail-data/:/var/mail/</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/mail-state/:/var/mail-state/</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/mail-logs/:/var/log/mail/</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/config/:/tmp/docker-mailserver/</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/config/dovecot/fts-xapian-plugin.conf:/etc/dovecot/conf.d/10-plugin.conf:ro</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/etc/localtime:/etc/localtime:ro</span><span class="w"></span>
<span class="w"> </span><span class="nt">restart</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">always</span><span class="w"></span>
<span class="w"> </span><span class="nt">stop_grace_period</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1m</span><span class="w"></span>
<span class="w"> </span><span class="nt">cap_add</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">NET_ADMIN</span><span class="w"></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>
<p><div class="highlight"><pre><span></span><code>docker-compose exec mailserver doveadm fts optimize -A
</code></pre></div>
Or like the <a href="../../../faq/#how-can-i-make-spamassassin-better-recognize-spam">Spamassassin example</a> shows, you can instead use <code>cron</code> from within <code>docker-mailserver</code> to avoid potential errors if the mail-server is not running:</p>
</li>
</ol>
<details class="example">
<summary>Example</summary>
<p>Create a <em>system</em> cron file:</p>
<div class="highlight"><pre><span></span><code><span class="c1"># in the docker-compose.yml root directory</span>
mkdir -p ./docker-data/dms/cron <span class="c1"># if you didn&#39;t have this folder before</span>
touch ./docker-data/dms/cron/fts_xapian
chown root:root ./docker-data/dms/cron/fts_xapian
chmod <span class="m">0644</span> ./docker-data/dms/cron/fts_xapian
</code></pre></div>
<p>Edit the system cron file <code>nano ./docker-data/dms/cron/fts_xapian</code>, and set an appropriate configuration:</p>
<div class="highlight"><pre><span></span><code><span class="c1"># Adding `MAILTO=&quot;&quot;` prevents cron emailing notifications of the task outcome each run</span><span class="w"></span>
<span class="na">MAILTO</span><span class="o">=</span><span class="s">&quot;&quot;</span><span class="w"></span>
<span class="c1">#</span><span class="w"></span>
<span class="c1"># m h dom mon dow user command</span><span class="w"></span>
<span class="c1">#</span><span class="w"></span>
<span class="c1"># Everyday 4:00AM, optimize index files</span><span class="w"></span>
<span class="na">0 4 * * * root doveadm fts optimize -A</span><span class="w"></span>
</code></pre></div>
<p>Then with <code>docker-compose.yml</code>:</p>
<div class="highlight"><pre><span></span><code><span class="nt">services</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">mailserver</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">docker.io/mailserver/docker-mailserver:latest</span><span class="w"></span>
<span class="w"> </span><span class="nt">volumes</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/cron/fts_xapian:/etc/cron.d/fts_xapian</span><span class="w"></span>
</code></pre></div>
</details>
<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="w"> </span><span class="nt">solr</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">lmmdock/dovecot-solr:latest</span><span class="w"></span>
<span class="w"> </span><span class="nt">volumes</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./docker-data/dms/config/dovecot/solr-dovecot:/opt/solr/server/solr/dovecot</span><span class="w"></span>
<span class="w"> </span><span class="nt">restart</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">always</span><span class="w"></span>
<span class="w"> </span><span class="nt">mailserver</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">depends_on</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">solr</span><span class="w"></span>
<span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">docker.io/mailserver/docker-mailserver:latest</span><span class="w"></span>
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span><span class="w"></span>
<span class="w"> </span><span class="nt">volumes</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span><span class="w"></span>
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">- ./docker-data/dms/config/dovecot/10-plugin.conf:/etc/dovecot/conf.d/10-plugin.conf:ro</span><span class="w"></span>
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span><span class="w"></span>
</code></pre></div>
</li>
<li>
<p><code>./docker-data/dms/config/dovecot/10-plugin.conf</code>:</p>
<div class="highlight"><pre><span></span><code><span class="na">mail_plugins</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">$mail_plugins fts fts_solr</span><span class="w"></span>
<span class="na">plugin {</span><span class="w"></span>
<span class="w"> </span><span class="na">fts</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">solr</span><span class="w"></span>
<span class="w"> </span><span class="na">fts_autoindex</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">yes</span><span class="w"></span>
<span class="w"> </span><span class="na">fts_solr</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">url=http://solr:8983/solr/dovecot/</span><span class="w"></span>
<span class="na">}</span><span class="w"></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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