/docs/latest/migrating-from-coreos/ Recent content in Migration from CoreOS Container Linux on Flatcar Container Linux Hugo en-us Copyright © The Flatcar Project Contributors. Copyright © Flatcar a Series of LF Projects, LLC. For website terms of use, trademark policy and other project policies please see <a href="https://lfprojects.org/policies/">lfprojects.org/policies</a>. /docs/latest/migrating-from-coreos/update-from-container-linux/ Mon, 01 Jan 0001 00:00:00 +0000 /docs/latest/migrating-from-coreos/update-from-container-linux/ <p>If you already have CoreOS Container Linux clusters and can&rsquo;t or don&rsquo;t want to freshly install Flatcar Container Linux, you can update to Flatcar Container Linux directly from CoreOS Container Linux by performing the following steps.</p> <p><strong>NOTE:</strong> General differences when <a href="/docs/latest/migrating-from-coreos/">migrating from CoreOS Container Linux</a> also apply.</p> <h2 id="the-migration-script">The migration script</h2> <p>The <a href="https://raw.githubusercontent.com/flatcar/flatcar-docs/main/update-to-flatcar.sh" target="_blank" rel="noopener">update-to-flatcar.sh</a> script does all required steps for you:</p> <div class="code-block position-relative"> <button class="btn btn-sm btn-copy position-absolute top-0 end-0 m-2" title="Copy to clipboard" aria-label="Copy to clipboard"> <i class="fa-regular fa-copy"></i> </button> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span><span class="lnt">2 </span><span class="lnt">3 </span><span class="lnt">4 </span><span class="lnt">5 </span><span class="lnt">6 </span><span class="lnt">7 </span><span class="lnt">8 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl"><span class="c1"># To be run on the node via SSH</span> </span></span><span class="line"><span class="cl">core@host ~ $ wget https://raw.githubusercontent.com/flatcar/flatcar-docs/main/update-to-flatcar.sh </span></span><span class="line"><span class="cl">core@host ~ $ less update-to-flatcar.sh <span class="c1"># Double check the content of the script</span> </span></span><span class="line"><span class="cl">core@host ~ $ chmod +x update-to-flatcar.sh </span></span><span class="line"><span class="cl">core@host ~ $ ./update-to-flatcar.sh </span></span><span class="line"><span class="cl"><span class="o">[</span>…<span class="o">]</span> </span></span><span class="line"><span class="cl">Done, please reboot now </span></span><span class="line"><span class="cl">core@host ~ $ sudo systemctl reboot</span></span></code></pre></td></tr></table> </div> </div> </div> <p>If it fails due to SSL connection issues from outdated certificates, you can also download the update payload of the latest Stable release through plain HTTP and use the <code>flatcar-update</code> script instead:</p>