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<h1>Linked containers</h1>
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<p>Watchtower will detect if there are links between any of the running containers and ensures that things are stopped/started in a way that won't break any of the links. If an update is detected for one of the dependencies in a group of linked containers, watchtower will stop and start all of the containers in the correct order so that the application comes back up correctly.</p>
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<p>For example, imagine you were running a <em>mysql</em> container and a <em>wordpress</em> container which had been linked to the <em>mysql</em> container. If watchtower were to detect that the <em>mysql</em> container required an update, it would first shut down the linked <em>wordpress</em> container followed by the <em>mysql</em> container. When restarting the containers it would handle <em>mysql</em> first and then <em>wordpress</em> to ensure that the link continued to work.</p>
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<p>If you want to override existing links you can use special <code>com.centurylinklabs.watchtower.depends-on</code> label with dependent container names, separated by a comma.</p>
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