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| <div class="edit-this-page"><a href="https://github.com/eclipse/che-docs/edit/master/modules/installation-guide/pages/configuring-storage-types.adoc">Edit this Page</a></div> |
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| <div class="content"> |
| <article class="doc"> |
| <h1 class="page">Configuring storage types</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Eclipse Che supports three types of storage with different capabilities:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Persistent</p> |
| </li> |
| <li> |
| <p>Ephemeral</p> |
| </li> |
| <li> |
| <p>Asynchronous</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_persistent_storage"><a class="anchor" href="#_persistent_storage"></a>Persistent storage</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Persistent storage allows storing user changes directly in the mounted Persistent Volume. User changes are kept safe by the Kubernetes or OpenShift infrastructure (storage backend) at the cost of slow I/O, especially with many small files. For example, Node.js projects tend to have many dependencies and the <code>node_modules/</code> directory is filled with thousands of small files.</p> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| I/O speeds vary depending on the <a href="https://kubernetes.io/docs/concepts/storage/storage-classes/">Storage Classes</a> configured in the environment. |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>Persistent storage is the default mode for new workspaces. To make this setting visible in workspace configuration, add the following to the devfile:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-yaml hljs" data-lang="yaml">attributes: |
| persistVolumes: 'true'</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_ephemeral_storage"><a class="anchor" href="#_ephemeral_storage"></a>Ephemeral storage</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ephemeral storage saves files to the <a href="https://kubernetes.io/docs/concepts/storage/volumes/#emptydir"><code>emptyDir</code></a> volume. This volume is initially empty. When a Pod is removed from a node, the data in the <code>emptyDir</code> volume is deleted forever. This means that all changes are lost on workspace stop or restart.</p> |
| </div> |
| <div class="admonitionblock important"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-important" title="Important"></i> |
| </td> |
| <td class="content"> |
| To save the changes, commit and push to the remote before stopping an ephemeral workspace. |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>Ephemeral mode provides faster I/O than persistent storage. To enable this storage type, add the following to workspace configuration:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-yaml hljs" data-lang="yaml">attributes: |
| persistVolumes: 'false'</code></pre> |
| </div> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <caption class="title">Table 1. Comparison between I/O of ephemeral (<code>emptyDir</code>) and persitent modes on <a href="https://kubernetes.io/docs/concepts/storage/storage-classes/#aws-ebs">AWS EBS</a></caption> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Command</th> |
| <th class="tableblock halign-left valign-top">Ephemeral</th> |
| <th class="tableblock halign-left valign-top">Persitent</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Clone Eclipse Che</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">0 m 19 s</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1 m 26 s</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Generate 1000 random files</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1 m 12 s</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">44 m 53 s</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_asynchronous_storage"><a class="anchor" href="#_asynchronous_storage"></a>Asynchronous storage</h2> |
| <div class="sectionbody"> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| Asynchronous storage is an experimental feature. |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>Asynchronous storage is a combination of persistent and ephemeral modes. The initial workspace container mounts the <code>emptyDir</code> volume. Then a backup is performed on workspace stop, and changes are restored on workspace start. Asynchronous storage provides fast I/O (similar to ephemeral mode), and workspace project changes are persisted.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Synchronization is performed by the <a href="https://rsync.samba.org/">rsync</a> tool using the <a href="https://www.openssh.com/">SSH</a> protocol. When a workspace is configured with asynchronous storage, the <a href="https://github.com/che-incubator/workspace-data-sync/">workspace-data-sync</a> plug-in is automatically added to the workspace configuration. The plug-in runs the <code>rsync</code> command on workspace start to restore changes. When a workspace is stopped, it sends changes to the permanent storage.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For relatively small projects, the restore procedure is fast, and project source files are immediately available after Che-Theia is initialized. In case <code>rsync</code> takes longer, the synchronization process is shown in the Che-Theia status-bar area. (<a href="https://github.com/eclipse/che-theia/tree/master/extensions/eclipse-che-theia-file-sync-tracker">Extension in Che-Theia repository</a>).</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <a class="image" href="../_images/troubleshooting/status-bar-file-sync.png"><img src="../_images/troubleshooting/status-bar-file-sync.png" alt="status bar file sync" width="Files synchronization progress"></a> |
| </div> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>Asynchronous mode has the following limitations:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Supports only the <em>common</em> PVC strategy</p> |
| </li> |
| <li> |
| <p>Supports only the <em>per-user</em> namespace strategy</p> |
| </li> |
| <li> |
| <p>Only one workspace can be running at a time</p> |
| </li> |
| </ul> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>To configure asynchronous storage for a workspace, add the following to workspace configuration:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-yaml hljs" data-lang="yaml">attributes: |
| asyncPersist: 'true' |
| persistVolumes: 'false'</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_configuring_storage_type_defaults_for_che_dashboard"><a class="anchor" href="#_configuring_storage_type_defaults_for_che_dashboard"></a>Configuring storage type defaults for Che dashboard</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Use the fo;llowing two <code>che.properties</code> to configure the default client values in Che dashboard:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><code>che.workspace.storage.available_types</code></dt> |
| <dd> |
| <p>Defines available values for storage types that clients like the dashboard propose for users during workspace creation or update. Available values: <code>persistent</code>, <code>ephemeral</code>, and <code>async</code>. Separate multiple values by commas. For example:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>che.workspace.storage.available_types=persistent,ephemeral,async</pre> |
| </div> |
| </div> |
| </dd> |
| <dt class="hdlist1"><code>che.workspace.storage.preferred_type</code></dt> |
| <dd> |
| <p>Defines the default value for storage type that clients like the dashboard propose for users during workspace creation or update. The <code>async</code> value is not recommended as the default type because it is experimental. For example:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>che.workspace.storage.preferred_type=persistent</pre> |
| </div> |
| </div> |
| </dd> |
| </dl> |
| </div> |
| <div class="paragraph"> |
| <p>The <strong>Storage Type</strong> drop-down menu is available on the <strong>Create Custom Workspace</strong> page of the user dashboard:</p> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <a class="image" href="../_images/workspaces/create-custom-ws-storage-type-2.png"><img src="../_images/workspaces/create-custom-ws-storage-type-2.png" alt="create custom ws storage type 2"></a> |
| </div> |
| </div> |
| <div class="imageblock"> |
| <div class="content"> |
| <a class="image" href="../_images/workspaces/create-custom-ws-storage-type.png"><img src="../_images/workspaces/create-custom-ws-storage-type.png" alt="create custom ws storage type"></a> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_idling_asynchronous_storage_pods"><a class="anchor" href="#_idling_asynchronous_storage_pods"></a>Idling asynchronous storage Pods</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Che can shut down the Asynchronous Storage Pod when not used for a configured period of time.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Use these configuration properties to adjust the behavior:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><code>che.infra.kubernetes.async.storage.shutdown_timeout_min</code></dt> |
| <dd> |
| <p>Defines the idle time after which the asynchronous storage Pod is stopped following the stopping of the last active workspace. The default value is 120 minutes.</p> |
| </dd> |
| <dt class="hdlist1"><code>che.infra.kubernetes.async.storage.shutdown_check_period_min</code></dt> |
| <dd> |
| <p>Defines the frequency with which the asynchronous storage Pod is checked for idleness. The default value is 30 minutes.</p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| </div> |
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