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<article class="doc">
<h1 class="page">Configuring storage classes</h1>
<div class="paragraph">
<p>To configure Che to use a configured infrastructure storage, install Che using storage classes. This is especially useful when a user wants to bind a persistent volume provided by a non-default provisioner. To do so, a user binds this storage for the Che data saving and sets the parameters for that storage. These parameters can determine the following:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>A special host path</p>
</li>
<li>
<p>A storage capacity</p>
</li>
<li>
<p>A volume mod</p>
</li>
<li>
<p>Mount options</p>
</li>
<li>
<p>A file system</p>
</li>
<li>
<p>An access mode</p>
</li>
<li>
<p>A storage type</p>
</li>
<li>
<p>And many others</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Che has two components that require persistent volumes to store data:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>A PostgreSQL database.</p>
</li>
<li>
<p>A Che workspaces. Che workspaces store source code using volumes, for example <code>/projects</code> volume.</p>
</li>
</ul>
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<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>Che workspaces source code is stored in the persistent volume only if a workspace is not ephemeral.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="ulist">
<div class="title">Persistent volume claims facts:</div>
<ul>
<li>
<p>Che does not create persistent volumes in the infrastructure.</p>
</li>
<li>
<p>Che uses persistent volume claims (PVC) to mount persistent volumes.</p>
</li>
<li>
<p>The Che server creates persistent volume claims.</p>
<div class="paragraph">
<p>A user defines a storage class name in the Che configuration to use the storage classes feature in the Che PVC. With storage classes, a user configures infrastructure storage in a flexible way with additional storage parameters. It is also possible to bind a static provisioned persistent volumes to the Che PVC using the class name.</p>
</div>
</li>
</ul>
</div>
<div class="paragraph">
<div class="title">Procedure</div>
<p>Use CheCluster Custom Resource definition to define storage classes:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Define storage class names: configure the <code>CheCluster</code> Custom Resource, and install Che. See <a href="../using-chectl-to-configure-the-checluster-custom-resource-during-installation/" class="xref page">Using chectl to configure the <code>CheCluster</code> Custom Resource during installation</a>.</p>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-yaml hljs" data-lang="yaml">spec:
components:
database:
pvc:
# keep blank unless you need to use a non default storage class for PostgreSQL PVC
storageClass: 'postgres-storage'
devEnvironments:
storage:
pvc:
# keep blank unless you need to use a non default storage class for workspace PVC(s)
storageClass: 'workspace-storage'</code></pre>
</div>
</div>
</li>
<li>
<p>Define the persistent volume for a PostgreSQL database in a <code>che-postgres-pv.yaml</code> file:</p>
<div class="listingblock">
<div class="title"><code>che-postgres-pv.yaml</code> file</div>
<div class="content">
<pre class="highlightjs highlight"><code class="language-yaml hljs" data-lang="yaml">apiVersion: v1
kind: PersistentVolume
metadata:
name: postgres-pv-volume
labels:
type: local
spec:
storageClassName: postgres-storage
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/data/che/postgres"</code></pre>
</div>
</div>
</li>
<li>
<p>Define the persistent volume for a Che workspace in a <code>che-postgres-pv.yaml</code> file:</p>
<div class="listingblock">
<div class="title"><code>che-workspace-pv.yaml</code> file</div>
<div class="content">
<pre class="highlightjs highlight"><code class="language-yaml hljs" data-lang="yaml">apiVersion: v1
kind: PersistentVolume
metadata:
name: workspace-pv-volume
labels:
type: local
spec:
storageClassName: workspace-storage
capacity:
storage: 10Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/data/che/workspace"</code></pre>
</div>
</div>
</li>
<li>
<p>Bind the two persistent volumes:</p>
<div class="listingblock">
<div class="content">
<pre>$ kubectl apply -f che-workspace-pv.yaml -f che-postgres-pv.yaml</pre>
</div>
</div>
</li>
</ol>
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<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>You must provide valid file permissions for volumes. You can do it using storage class configuration or manually. To manually define permissions, define <code>storageClass#mountOptions</code> <code>uid</code> and <code>gid</code>. PostgreSQL volume requires <code>uid=26</code> and <code>gid=26</code>.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="ulist">
<div class="title">Additional resources</div>
<ul>
<li>
<p><a href="../using-chectl-to-configure-the-checluster-custom-resource-during-installation/" class="xref page">Using chectl to configure the <code>CheCluster</code> Custom Resource during installation</a></p>
</li>
<li>
<p><a href="../using-the-cli-to-configure-the-checluster-custom-resource/" class="xref page">Using the CLI to configure the CheCluster Custom Resource</a></p>
</li>
</ul>
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