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<!--replace-end-7--><!--replace-end-4--><!--replace-end-1--></head><body><div class="ui fluid container universe"><!--replace-start-2--><!--replace-start-3--><!--replace-start-6--><div class="ui text container" id="zettel-container" style="position: relative"><div class="zettel-view"><article class="ui raised attached segment zettel-content"><div class="pandoc"><h1 id="title-h1">Docker storage</h1><p>The following problems related to storage face containerized environments:</p><ul><li><p>Container storage is ephemeral. When the container is removed the read-write layer is removed. How can we persist data?</p></li><li><p>Container storage is isolated: containers cannot access each other’s file systems. If they need to share data, this could be a problem</p></li></ul><h3 id="docker-volumes">Docker volumes</h3><p>Docker volumes are the solution to this. Volumes:</p><ul><li>store data on the host file system (i.e. outside the container)</li><li>persist data beyond the lifecycle of the container</li></ul><blockquote><p>A Docker volume is a logical volume that exists outside the container file system. It maps to a directory on the host and this location is managed by Docker - not much control over this.</p></blockquote><p>Can be named or anonymous. Anonymous vols are created by Docker as needed. Named come from the user.</p><p>Volumes can be <strong>named</strong> or <strong>anonymous</strong>. Anonymous volumes are created by Docker as needed. Named volumes are named by the user. In both cases Docker decides where to create the volume.</p><h3 id="creating-a-volume">Creating a volume</h3><pre><code class="sh language-sh">docker run -d -rm -v /usr/share/nginx/html nginx:latest</code></pre><p>The <code>-v</code> flag indicates volume. The file reference is the mount point <em>within</em> the container. This is how the persistent storage it will appear. The <em>actual</em> volume exists outside of the container anonymously in a place decided by Docker.</p><p>To create a named volume you first have to create:</p><pre><code class="language-none">docker volume create volume_name</code></pre><p>Then you can designate it:</p><pre><code class="language-none">docker run -d -rm -v volume_name:/usr/share/nginx/html nginx:latest</code></pre><p>The actual location is still hidden and decided by Docker.</p><p>As these are anonymous they will show ups as GUIDs in the volume viewer in Docker Desktop:</p><p>// Add: screenshot</p><h3 id="commands">Commands</h3><pre><code class="language-none">docker volume ls
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docker volume rm
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docker volume inspect
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docker volume prune // remove all unused volumes</code></pre><p>Inspect is only really informative if you are on Linux because it will show you the actual physical path. With Windows and Mac the referernce is to a virtual machine.</p></div></article><nav class="ui attached segment deemphasized bottomPane" id="neuron-tags-pane"><div><span class="ui basic label zettel-tag" title="Tag">docker</span></div></nav><nav class="ui bottom attached icon compact inverted menu blue" id="neuron-nav-bar"><!--replace-start-9--><!--replace-end-9--><a class="right item" href="impulse.html" title="Open Impulse"><i class="wave square icon"></i></a></nav></div></div><!--replace-end-6--><!--replace-end-3--><!--replace-end-2--><div class="ui center aligned container footer-version"><div class="ui tiny image"><a href="https://neuron.zettel.page"><img alt="logo" src="https://raw.githubusercontent.com/srid/neuron/master/assets/neuron.svg" title="Generated by Neuron 1.9.35.3" /></a></div></div></div></body></html> |