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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z"/></svg>
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<h1>Update and Cleanup</h1>
<h2 id="automatic-update"><a class="toclink" href="#automatic-update">Automatic Update</a></h2>
<p>Docker images are handy but it can get a a hassle to keep them updated. Also when a repository is automated you want to get these images when they get out.</p>
<p>One could setup a complex action/hook-based workflow using probes, but there is a nice, easy to use docker image that solves this issue and could prove useful: <a href="https://hub.docker.com/r/containrrr/watchtower"><code>watchtower</code></a>.</p>
<p>A docker-compose example:</p>
<div class="highlight"><pre><span></span><code><span class="nt">services</span><span class="p">:</span>
<span class="nt">watchtower</span><span class="p">:</span>
<span class="nt">restart</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">always</span>
<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">containrrr/watchtower: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">/var/run/docker.sock:/var/run/docker.sock</span>
</code></pre></div>
<p>For more details, see the <a href="https://containrrr.github.io/watchtower/">manual</a></p>
<h2 id="automatic-cleanup"><a class="toclink" href="#automatic-cleanup">Automatic Cleanup</a></h2>
<p>When you are pulling new images in automatically, it would be nice to have them cleaned up as well. There is also a docker image for this: <a href="https://hub.docker.com/r/spotify/docker-gc/"><code>spotify/docker-gc</code></a>.</p>
<p>A docker-compose example:</p>
<div class="highlight"><pre><span></span><code><span class="nt">services</span><span class="p">:</span>
<span class="nt">docker-gc</span><span class="p">:</span>
<span class="nt">restart</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">always</span>
<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">spotify/docker-gc: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">/var/run/docker.sock:/var/run/docker.sock</span>
</code></pre></div>
<p>For more details, see the <a href="https://github.com/spotify/docker-gc/blob/master/README.md">manual</a></p>
<p>Or you can just use the <a href="https://containrrr.github.io/watchtower/arguments/#cleanup"><code>--cleanup</code></a> option provided by <code>containrrr/watchtower</code>.</p>
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