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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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<pre><code class="bash">docker run -d \
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--name watchtower \
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-v /var/run/docker.sock:/var/run/docker.sock \
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containrrr/watchtower
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</code></pre>
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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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<pre><code class="bash">docker run -d \
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--name watchtower \
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-e REPO_USER=username \
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-e REPO_PASS=password \
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-v /var/run/docker.sock:/var/run/docker.sock \
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containrrr/watchtower container_to_watch --debug
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</code></pre>
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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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<pre><code class="bash">docker run -d \
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--name watchtower \
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-v /home/<user>/.docker/config.json:/config.json \
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-v /var/run/docker.sock:/var/run/docker.sock \
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containrrr/watchtower container_to_watch --debug
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</code></pre>
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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 watched image (you can omit the https://). Here is a complete docker-compose.yml file that starts up a docker container from a private repo at Docker Hub and monitors it with watchtower. Note the command argument changing the interval to 30s rather than the default 5 minutes.</p>
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<pre><code class="json">version: "3"
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services:
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cavo:
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image: index.docker.io/<org>/<image>:<tag>
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ports:
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- "443:3443"
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- "80:3080"
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watchtower:
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image: containrrr/watchtower
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volumes:
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- /var/run/docker.sock:/var/run/docker.sock
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- /root/.docker/config.json:/config.json
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command: --interval 30
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</code></pre>
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