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Lifecycle hooks
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Lifecycle hooks
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<a href="#executing_commands_before_and_after_updating" class="md-nav__link">
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Executing commands before and after updating
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Specifying update commands
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Execution failure
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Running multiple instances
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Executing commands before and after updating
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Specifying update commands
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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>Lifecycle hooks</h1>
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<h2 id="executing_commands_before_and_after_updating">Executing commands before and after updating<a class="headerlink" href="#executing_commands_before_and_after_updating" title="Permanent link">¶</a></h2>
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<blockquote>
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<p><strong>DO NOTE</strong>: These are shell commands executed with <code>sh</code>, and therefore require the
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container to provide the <code>sh</code> executable.</p>
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</blockquote>
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<p>It is possible to execute <em>pre/post-check</em> and <em>pre/post-update</em> commands
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<strong>inside</strong> every container updated by watchtower.</p>
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<ul>
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<li>The <em>pre-check</em> command is executed for each container prior to every update cycle.</li>
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<li>The <em>pre-update</em> command is executed before stopping the container when an update is about to start.</li>
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<li>The <em>post-update</em> command is executed after restarting the updated container</li>
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<li>The <em>post-check</em> command is executed for each container post every update cycle.</li>
|
|
</ul>
|
|
<p>This feature is disabled by default. To enable it, you need to set the option
|
|
<code>--enable-lifecycle-hooks</code> on the command line, or set the environment variable
|
|
<code>WATCHTOWER_LIFECYCLE_HOOKS</code> to <code>true</code>.</p>
|
|
<h3 id="specifying_update_commands">Specifying update commands<a class="headerlink" href="#specifying_update_commands" title="Permanent link">¶</a></h3>
|
|
<p>The commands are specified using docker container labels, the following are currently available:</p>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Type</th>
|
|
<th>Docker Container Label</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td>Pre Check</td>
|
|
<td><code>com.centurylinklabs.watchtower.lifecycle.pre-check</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td>Pre Update</td>
|
|
<td><code>com.centurylinklabs.watchtower.lifecycle.pre-update</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td>Post Update</td>
|
|
<td><code>com.centurylinklabs.watchtower.lifecycle.post-update</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td>Post Check</td>
|
|
<td><code>com.centurylinklabs.watchtower.lifecycle.post-check</code></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>These labels can be declared as instructions in a Dockerfile (with some example .sh files):</p>
|
|
<div class="codehilite"><pre><span></span><code><span class="k">LABEL</span> com.centurylinklabs.watchtower.lifecycle.pre-check<span class="o">=</span><span class="s2">"/sync.sh"</span>
|
|
<span class="k">LABEL</span> com.centurylinklabs.watchtower.lifecycle.pre-update<span class="o">=</span><span class="s2">"/dump-data.sh"</span>
|
|
<span class="k">LABEL</span> com.centurylinklabs.watchtower.lifecycle.post-update<span class="o">=</span><span class="s2">"/restore-data.sh"</span>
|
|
<span class="k">LABEL</span> com.centurylinklabs.watchtower.lifecycle.post-check<span class="o">=</span><span class="s2">"/send-heartbeat.sh"</span>
|
|
</code></pre></div>
|
|
|
|
<p>Or be specified as part of the <code>docker run</code> command line:</p>
|
|
<div class="codehilite"><pre><span></span><code>docker run -d <span class="se">\</span>
|
|
--label<span class="o">=</span>com.centurylinklabs.watchtower.lifecycle.pre-check<span class="o">=</span><span class="s2">"/sync.sh"</span> <span class="se">\</span>
|
|
--label<span class="o">=</span>com.centurylinklabs.watchtower.lifecycle.pre-update<span class="o">=</span><span class="s2">"/dump-data.sh"</span> <span class="se">\</span>
|
|
--label<span class="o">=</span>com.centurylinklabs.watchtower.lifecycle.post-update<span class="o">=</span><span class="s2">"/restore-data.sh"</span> <span class="se">\</span>
|
|
someimage
|
|
--label<span class="o">=</span>com.centurylinklabs.watchtower.lifecycle.post-check<span class="o">=</span><span class="s2">"/send-heartbeat.sh"</span> <span class="se">\</span>
|
|
</code></pre></div>
|
|
|
|
<h3 id="timeouts">Timeouts<a class="headerlink" href="#timeouts" title="Permanent link">¶</a></h3>
|
|
<p>The timeout for all lifecycle commands is 60 seconds. After that, a timeout will
|
|
occur, forcing Watchtower to continue the update loop.</p>
|
|
<h4 id="pre-update_timeouts">Pre-update timeouts<a class="headerlink" href="#pre-update_timeouts" title="Permanent link">¶</a></h4>
|
|
<p>For the <code>pre-update</code> lifecycle command, it is possible to override this timeout to
|
|
allow the script to finish before forcefully killing it. This is done by adding the
|
|
label <code>com.centurylinklabs.watchtower.lifecycle.pre-update-timeout</code> followed by
|
|
the timeout expressed in minutes.</p>
|
|
<p>If the label value is explicitly set to <code>0</code>, the timeout will be disabled. </p>
|
|
<h3 id="execution_failure">Execution failure<a class="headerlink" href="#execution_failure" title="Permanent link">¶</a></h3>
|
|
<p>The failure of a command to execute, identified by an exit code different than
|
|
0, will not prevent watchtower from updating the container. Only an error
|
|
log statement containing the exit code will be reported.</p>
|
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