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<title data-rh="true">Dockershim FAQ | Rancher</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://ranchermanager.docs.rancher.com/faq/dockershim"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Dockershim FAQ | Rancher"><meta data-rh="true" name="description" content="The Dockershim is the CRI compliant layer between the Kubelet and the Docker daemon. As part of the Kubernetes 1.20 release, the deprecation of the in-tree Dockershim was announced. Removal is currently scheduled for Kubernetes 1.24. For more information on the deprecation and its timelines, see the Kubernetes Dockershim Deprecation FAQ."><meta data-rh="true" property="og:description" content="The Dockershim is the CRI compliant layer between the Kubelet and the Docker daemon. As part of the Kubernetes 1.20 release, the deprecation of the in-tree Dockershim was announced. Removal is currently scheduled for Kubernetes 1.24. For more information on the deprecation and its timelines, see the Kubernetes Dockershim Deprecation FAQ."><link data-rh="true" rel="icon" href="/img/favicon.png"><link data-rh="true" rel="alternate" href="https://ranchermanager.docs.rancher.com/faq/dockershim" hreflang="en"><link data-rh="true" rel="alternate" href="https://ranchermanager.docs.rancher.com/zh/faq/dockershim" hreflang="zh"><link data-rh="true" rel="alternate" href="https://ranchermanager.docs.rancher.com/faq/dockershim" hreflang="x-default"><link data-rh="true" rel="preconnect" href="https://30NEY6C9UY-dsn.algolia.net" crossorigin="anonymous"><link data-rh="true" rel="canonical" href="https://ranchermanager.docs.rancher.com/faq/dockershim"><link rel="preconnect" href="https://www.googletagmanager.com">
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1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">FAQ</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Dockershim FAQ</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Latest</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Dockershim FAQ</h1></header><p>The Dockershim is the CRI compliant layer between the Kubelet and the Docker daemon. As part of the Kubernetes 1.20 release, the <a href="https://kubernetes.io/blog/2020/12/02/dont-panic-kubernetes-and-docker/" target="_blank" rel="noopener noreferrer">deprecation of the in-tree Dockershim was announced</a>. Removal is currently scheduled for Kubernetes 1.24. For more information on the deprecation and its timelines, see the <a href="https://kubernetes.io/blog/2020/12/02/dockershim-faq/#when-will-dockershim-be-removed" target="_blank" rel="noopener noreferrer">Kubernetes Dockershim Deprecation FAQ</a>.</p><p>RKE clusters, starting with Kubernetes 1.21, now support the external Dockershim to continue leveraging Docker as the CRI runtime. We now implement the upstream open source community Dockershim announced by <a href="https://www.mirantis.com/blog/mirantis-to-take-over-support-of-kubernetes-dockershim-2/" target="_blank" rel="noopener noreferrer">Mirantis and Docker</a> to ensure RKE clusters can continue to leverage Docker.</p><p>To enable the external Dockershim, configure the following option.</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">enable_cri_dockerd: true</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>For users looking to use another container runtime, Rancher has the edge-focused K3s and datacenter-focused RKE2 Kubernetes distributions that use containerd as the default runtime. Imported RKE2 and K3s Kubernetes clusters can then be upgraded and managed through Rancher even after the removal of in-tree Dockershim in Kubernetes 1.24.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="faq">FAQ<a href="#faq" class="hash-link" aria-label="Direct link to FAQ" title="Direct link to FAQ">​</a></h3><br><p>Q. Do I have to upgrade Rancher to get Rancher’s support of the upstream Dockershim?</p><p>The upstream support of Dockershim begins for RKE in Kubernetes 1.21. You will need to be on Rancher 2.6 or above to have support for RKE with Kubernetes 1.21. See our <a href="https://rancher.com/support-maintenance-terms/all-supported-versions/rancher-v2.6.0/" target="_blank" rel="noopener noreferrer">support matrix</a> for details.</p><br><p>Q. I am currently on RKE with Kubernetes 1.20. Do I need to upgrade to RKE with Kubernetes 1.21 sooner to avoid being out of support for Dockershim?</p><p>A. The version of Dockershim in RKE with Kubernetes 1.20 will continue to work and is not scheduled for removal upstream until Kubernetes 1.24. It will only emit a warning of its future deprecation, which Rancher has mitigated in RKE with Kubernetes 1.21. You can plan your upgrade to Kubernetes 1.21 as you would normally, but should consider enabling the external Dockershim by Kubernetes 1.22. The external Dockershim will need to be enabled before upgrading to Kubernetes 1.24, at which point the existing implementation will be removed.</p><p>For more information on the deprecation and its timeline, see the <a href="https://kubernetes.io/blog/2020/12/02/dockershim-faq/#when-will-dockershim-be-removed" target="_blank" rel="noopener noreferrer">Kubernetes Dockershim Deprecation FAQ</a>.</p><br><p>Q: What are my other options if I don’t want to depend on the Dockershim?</p><p>A: You can use a runtime like containerd with Kubernetes that does not require Dockershim support. RKE2 or K3s are two options for doing this.</p><br><p>Q: If I am already using RKE1 and want to switch to RKE2, what are my migration options?</p><p>A: Rancher is exploring the possibility of an in-place upgrade path. Alternatively you can always migrate workloads from one cluster to another using kubectl.</p><br></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/rancher/rancher-docs/edit/main/docs/faq/dockershim.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2024-04-09T21:10:29.000Z">Apr 9, 2024</time></b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/faq/install-and-configure-kubectl"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Installing and Configuring kubectl</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/faq/technical-items"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Technical FAQ</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#faq" class="table-of-contents__link toc-highlight">FAQ</a></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2024 SUSE Rancher. 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