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Watchtower
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Usage overview
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Usage overview
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Lifecycle hooks
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Running multiple instances
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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>Usage overview</h1>
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<p>Watchtower is itself packaged as a Docker container so installation is as simple as pulling the <code>containrrr/watchtower</code> image. If you are using ARM based architecture, pull the appropriate <code>containrrr/watchtower:armhf-<tag></code> image from the <a href="https://hub.docker.com/r/containrrr/watchtower/tags/">containrrr Docker Hub</a>.</p>
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<p>Since the watchtower code needs to interact with the Docker API in order to monitor the running containers, you need to mount <em>/var/run/docker.sock</em> into the container with the <code>-v</code> flag when you run it.</p>
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<p>Run the <code>watchtower</code> container with the following command:</p>
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<div class="highlight"><pre><span></span><code>docker run -d <span class="se">\</span>
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--name watchtower <span class="se">\</span>
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-v /var/run/docker.sock:/var/run/docker.sock <span class="se">\</span>
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containrrr/watchtower
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</code></pre></div>
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<p>If pulling images from private Docker registries, supply registry authentication credentials with the environment variables <code>REPO_USER</code> and <code>REPO_PASS</code>
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or by mounting the host's docker config file into the container (at the root of the container filesystem <code>/</code>).</p>
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<p>Passing environment variables:</p>
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<div class="highlight"><pre><span></span><code>docker run -d <span class="se">\</span>
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--name watchtower <span class="se">\</span>
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-e <span class="nv">REPO_USER</span><span class="o">=</span>username <span class="se">\</span>
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-e <span class="nv">REPO_PASS</span><span class="o">=</span>password <span class="se">\</span>
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-v /var/run/docker.sock:/var/run/docker.sock <span class="se">\</span>
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containrrr/watchtower container_to_watch --debug
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</code></pre></div>
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<p>Also check out <a href="https://stackoverflow.com/a/30494145/7872793">this Stack Overflow answer</a> for more options on how to pass environment variables.</p>
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<p>Mounting the host's docker config file:</p>
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<div class="highlight"><pre><span></span><code>docker run -d <span class="se">\</span>
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--name watchtower <span class="se">\</span>
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-v /home/<user>/.docker/config.json:/config.json <span class="se">\</span>
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-v /var/run/docker.sock:/var/run/docker.sock <span class="se">\</span>
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containrrr/watchtower container_to_watch --debug
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</code></pre></div>
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<div class="admonition note">
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<p class="admonition-title">Changes to config.json while running</p>
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<p>If you mount <code>config.json</code> in the manner above, changes from the host system will (generally) not be propagated to the
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running container. Mounting files into the Docker daemon uses bind mounts, which are based on inodes. Most
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applications (including <code>docker login</code> and <code>vim</code>) will not directly edit the file, but instead make a copy and replace
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the original file, which results in a new inode which in turn <em>breaks</em> the bind mount.<br />
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<strong>As a workaround</strong>, you can create a symlink to your <code>config.json</code> file and then mount the symlink in the container.
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The symlinked file will always have the same inode, which keeps the bind mount intact and will ensure changes
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to the original file are propagated to the running container (regardless of the inode of the source file!).</p>
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</div>
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<p>If you mount the config file as described above, be sure to also prepend the URL for the registry when starting up your
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watched image (you can omit the https://). Here is a complete docker-compose.yml file that starts up a docker container
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from a private repo at Docker Hub and monitors it with watchtower. Note the command argument changing the interval to
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30s rather than the default 24 hours.</p>
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<div class="highlight"><pre><span></span><code><span class="nt">version</span><span class="p">:</span> <span class="s">"3"</span>
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<span class="nt">services</span><span class="p">:</span>
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<span class="nt">cavo</span><span class="p">:</span>
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<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">index.docker.io/<org>/<image>:<tag></span>
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<span class="nt">ports</span><span class="p">:</span>
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<span class="p p-Indicator">-</span> <span class="s">"443:3443"</span>
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<span class="p p-Indicator">-</span> <span class="s">"80:3080"</span>
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<span class="nt">watchtower</span><span class="p">:</span>
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<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">containrrr/watchtower</span>
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<span class="nt">volumes</span><span class="p">:</span>
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<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">/var/run/docker.sock:/var/run/docker.sock</span>
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<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">/root/.docker/config.json:/config.json</span>
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<span class="nt">command</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">--interval 30</span>
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