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<p>When watchtower detects that a running container needs to be updated it will stop the container by sending it a SIGTERM signal.
If your container should be shutdown with a different signal you can communicate this to watchtower by setting a label named <em>com.centurylinklabs.watchtower.stop-signal</em> with the value of the desired signal.</p>
<p>This label can be coded directly into your image by using the <code>LABEL</code> instruction in your Dockerfile:</p>
<div class="codehilite"><pre><span></span><code><span class="k">LABEL</span> com.centurylinklabs.watchtower.stop-signal<span class="o">=</span><span class="s2">&quot;SIGHUP&quot;</span>
<div class="highlight"><pre><span></span><code><span class="k">LABEL</span> com.centurylinklabs.watchtower.stop-signal<span class="o">=</span><span class="s2">&quot;SIGHUP&quot;</span>
</code></pre></div>
<p>Or, it can be specified as part of the <code>docker run</code> command line:</p>
<div class="codehilite"><pre><span></span><code>docker run -d --label<span class="o">=</span>com.centurylinklabs.watchtower.stop-signal<span class="o">=</span>SIGHUP someimage
<div class="highlight"><pre><span></span><code>docker run -d --label<span class="o">=</span>com.centurylinklabs.watchtower.stop-signal<span class="o">=</span>SIGHUP someimage
</code></pre></div>