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<h1>Running multiple instances</h1>
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<p>By default, Watchtower will clean up other instances and won't allow multiple instances running on the same Docker host or swarm. It is possible to override this behavior by defining a <a href="https://containrrr.github.io/watchtower/arguments/#filter_by_scope">scope</a> to each running instance. </p>
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<p>Notice that:
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- Multiple instances can't run with the same scope;
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- An instance without a scope will clean up other running instances, even if they have a defined scope;</p>
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<p>To define an instance monitoring scope, use the <code>--scope</code> argument or the <code>WATCHTOWER_SCOPE</code> environment variable on startup and set the <em>com.centurylinklabs.watchtower.scope</em> label with the same value for the containers you want to include in this instance's scope (including the instance itself).</p>
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<p>For example, in a Docker Compose config file:</p>
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<div class="codehilite"><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">app-monitored-by-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">myapps/monitored-by-watchtower</span>
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<span class="nt">labels</span><span class="p">:</span>
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<span class="p p-Indicator">-</span> <span class="s">"com.centurylinklabs.watchtower.scope=myscope"</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="nt">command</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">--interval 30 --scope myscope</span>
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<span class="nt">labels</span><span class="p">:</span>
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<span class="p p-Indicator">-</span> <span class="s">"com.centurylinklabs.watchtower.scope=myscope"</span>
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</code></pre></div>
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