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| <a class="nav-link" href="../checluster-custom-resource-fields-reference/"><code>CheCluster</code> Custom Resource fields reference</a> |
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| <h1 class="page">Configuring fuse-overlayfs</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>By default, the Universal Developer Image (UDI) contains Podman and Buildah which you can use to build and push container images within a workspace. |
| However, Podman and Buildah in the UDI are configured to use the <code>vfs</code> storage driver which does not provide copy-on-write support. |
| For more efficient image management, use the fuse-overlayfs storage driver which supports copy-on-write in rootless environments.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_enabling_container_access_to_devfuse_for_openshift"><a class="anchor" href="#_enabling_container_access_to_devfuse_for_openshift"></a>Enabling container access to /dev/fuse for OpenShift</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>To use fuse-overlayfs, you must make <code>/dev/fuse</code> accessible to workspace containers first.</p> |
| </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>This procedure is not necessary for OpenShift versions 4.15 and later, since the <code>/dev/fuse</code> device is available by default. See <a href="https://docs.openshift.com/container-platform/4.15/release_notes/ocp-4-15-release-notes.html#ocp-4-15-nodes-dev-fuse">Release Notes</a>.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="admonitionblock warning"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-warning" title="Warning"></i> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>Creating <code>MachineConfig</code> resources on an OpenShift cluster is a potentially dangerous task, as you are making advanced, system-level changes to the cluster.</p> |
| </div> |
| <div class="paragraph"> |
| <p>View the <a href="https://docs.openshift.com/container-platform/4.12/post_installation_configuration/machine-configuration-tasks.html#machine-config-overview-post-install-machine-configuration-tasks">MachineConfig documentation</a> for more details and possible risks.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="ulist"> |
| <div class="title">Prerequisites</div> |
| <ul> |
| <li> |
| <p>The <a href="https://docs.openshift.com/container-platform/4.12/installing/install_config/installing-customizing.html#installation-special-config-butane-install_installing-customizing">Butane</a> tool (<code>butane</code>) is installed in the operating system you are using.</p> |
| </li> |
| <li> |
| <p>An active <code>kubectl</code> session with administrative permissions to the destination OpenShift cluster. See <a href="https://kubernetes.io/docs/reference/kubectl/overview/">Overview of kubectl</a>.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="olist arabic"> |
| <div class="title">Procedure</div> |
| <ol class="arabic"> |
| <li> |
| <p>Set the environment variable based on the type of your OpenShift cluster: a single node cluster, or a multi node cluster with separate control plane and worker nodes.</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>For a single node cluster, set:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ NODE_ROLE=master</pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>For a multi node cluster, set:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ NODE_ROLE=worker</pre> |
| </div> |
| </div> |
| </li> |
| </ul> |
| </div> |
| </li> |
| <li> |
| <p>Set the environment variable for the OpenShift Butane config version. This variable is the major and minor version of the OpenShift cluster. For example, <code>4.12.0</code>, <code>4.13.0</code>, or <code>4.14.0</code>.</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ VERSION=4.12.0</pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>Create a <code>MachineConfig</code> resource that creates a drop-in CRI-O configuration file named <code>99-podman-fuse</code> in the <code>NODE_ROLE</code> nodes. This configuration file makes access to the <code>/dev/fuse</code> device possible for certain pods.</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-none hljs">cat << EOF | butane | oc apply -f - |
| variant: openshift |
| version: ${VERSION} |
| metadata: |
| labels: |
| machineconfiguration.openshift.io/role: ${NODE_ROLE} |
| name: 99-podman-dev-fuse-${NODE_ROLE} |
| storage: |
| files: |
| - path: /etc/crio/crio.conf.d/99-podman-fuse <i class="conum" data-value="1"></i><b>(1)</b> |
| mode: 0644 |
| overwrite: true |
| contents: <i class="conum" data-value="2"></i><b>(2)</b> |
| inline: | |
| [crio.runtime.workloads.podman-fuse] <i class="conum" data-value="3"></i><b>(3)</b> |
| activation_annotation = "io.openshift.podman-fuse" <i class="conum" data-value="4"></i><b>(4)</b> |
| allowed_annotations = [ |
| "io.kubernetes.cri-o.Devices" <i class="conum" data-value="5"></i><b>(5)</b> |
| ] |
| [crio.runtime] |
| allowed_devices = ["/dev/fuse"] <i class="conum" data-value="6"></i><b>(6)</b> |
| EOF</code></pre> |
| </div> |
| </div> |
| <div class="colist arabic"> |
| <table> |
| <tr> |
| <td><i class="conum" data-value="1"></i><b>1</b></td> |
| <td>The absolute file path to the new drop-in configuration file for CRI-O.</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="2"></i><b>2</b></td> |
| <td>The content of the new drop-in configuration file.</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="3"></i><b>3</b></td> |
| <td>Define a <code>podman-fuse</code> workload.</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="4"></i><b>4</b></td> |
| <td>The pod annotation that activates the <code>podman-fuse</code> workload settings.</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="5"></i><b>5</b></td> |
| <td>List of annotations the <code>podman-fuse</code> workload is allowed to process.</td> |
| </tr> |
| <tr> |
| <td><i class="conum" data-value="6"></i><b>6</b></td> |
| <td>List of devices on the host that a user can specify with the <code>io.kubernetes.cri-o.Devices</code> annotation.</td> |
| </tr> |
| </table> |
| </div> |
| </li> |
| <li> |
| <p>After applying the <code>MachineConfig</code> resource, scheduling will be temporarily disabled for each node with the <code>worker</code> role as changes are applied. View the nodes' statuses.</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ oc get nodes</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Example output:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>NAME STATUS ROLES AGE VERSION |
| ip-10-0-136-161.ec2.internal Ready worker 28m v1.27.9 |
| ip-10-0-136-243.ec2.internal Ready master 34m v1.27.9 |
| ip-10-0-141-105.ec2.internal Ready,SchedulingDisabled worker 28m v1.27.9 |
| ip-10-0-142-249.ec2.internal Ready master 34m v1.27.9 |
| ip-10-0-153-11.ec2.internal Ready worker 28m v1.27.9 |
| ip-10-0-153-150.ec2.internal Ready master 34m v1.27.9</pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>Once all nodes with the <code>worker</code> role have a status <code>Ready</code>, <code>/dev/fuse</code> will be available to any pod with the following annotations.</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-yaml hljs" data-lang="yaml">io.openshift.podman-fuse: '' |
| io.kubernetes.cri-o.Devices: /dev/fuse</code></pre> |
| </div> |
| </div> |
| </li> |
| </ol> |
| </div> |
| <div class="olist arabic"> |
| <div class="title">Verification steps</div> |
| <ol class="arabic"> |
| <li> |
| <p>Get the name of a node with a <code>worker</code> role:</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ oc get nodes</pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>Open an <code>oc debug</code> session to a worker node.</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>$ oc debug node/<em><nodename></em></pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>Verify that a new CRI-O config file named <code>99-podman-fuse</code> exists.</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre>sh-4.4# stat /host/etc/crio/crio.conf.d/99-podman-fuse</pre> |
| </div> |
| </div> |
| </li> |
| </ol> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_using_fuse_overlayfs_for_podman_and_buildah_within_a_workspace"><a class="anchor" href="#_using_fuse_overlayfs_for_podman_and_buildah_within_a_workspace"></a>Using fuse-overlayfs for Podman and Buildah within a workspace</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Users can follow <a href="../../end-user-guide/using-the-fuse-overlay-storage-driver/" class="xref page">Using the fuse-overlayfs storage driver for Podman and Buildah</a> to update existing workspaces to use the fuse-overlayfs storage driver for Podman and Buildah.</p> |
| </div> |
| </div> |
| </div> |
| </article> |
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