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<article role="main" id="furo-main-content">
<section id="how-to-migrate-lxd-instances-between-servers">
<span id="howto-instances-migrate"></span><h1>How to migrate LXD instances between servers<a class="headerlink" href="#how-to-migrate-lxd-instances-between-servers" title="Link to this heading">¶</a></h1>
<p>If you use the LXD client, you can migrate or copy instances from one LXD server (remote or local) to another.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><a class="reference internal" href="../../remotes/#remotes"><span class="std std-ref">Remote servers</span></a> are a concept of the LXD client.
Therefore, there is no direct equivalent for migrating instances between servers in the API or the UI.</p>
<p>However, you can <a class="reference internal" href="../instances_backup/#instances-backup-export-instance"><span class="std std-ref">export an instance</span></a> from one server and <a class="reference internal" href="../instances_backup/#instances-backup-import-instance"><span class="std std-ref">import it</span></a> to another server.</p>
</div>
<section id="migrate-instances">
<h2>Migrate instances<a class="headerlink" href="#migrate-instances" title="Link to this heading">¶</a></h2>
<p>To migrate an instance (move it from one LXD server to another) using the CLI, use the <a class="reference internal" href="../../reference/manpages/lxc/move/#lxc-move-md"><span class="std std-ref"><code class="docutils literal notranslate"><span class="pre">lxc</span> <span class="pre">move</span></code></span></a> command:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>lxc move [<source_remote>:]<source_instance_name> <target_remote>:[<target_instance_name>]
</pre></div>
</div>
<p>When migrating a container, you must stop it first.</p>
<p>When migrating a virtual machine, you must either enable <a class="reference internal" href="#live-migration"><span class="std std-ref">Live migration</span></a> or stop it first.</p>
</section>
<section id="copy-instances">
<h2>Copy instances<a class="headerlink" href="#copy-instances" title="Link to this heading">¶</a></h2>
<p>Use the <a class="reference internal" href="../../reference/manpages/lxc/copy/#lxc-copy-md"><span class="std std-ref"><code class="docutils literal notranslate"><span class="pre">lxc</span> <span class="pre">copy</span></code></span></a> command if you want to duplicate the instance instead of migrating it:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>lxc copy [<source_remote>:]<source_instance_name> <target_remote>:[<target_instance_name>]
</pre></div>
</div>
<p>If the volume already exists in the target location, use the <code class="docutils literal notranslate"><span class="pre">--refresh</span></code> flag to update the copy. To learn about the benefits, see: <a class="reference internal" href="../../reference/storage_drivers/#storage-optimized-volume-transfer"><span class="std std-ref">Optimized volume transfer</span></a>.</p>
</section>
<section id="migrate-and-copy-options">
<h2>Migrate and copy options<a class="headerlink" href="#migrate-and-copy-options" title="Link to this heading">¶</a></h2>
<p>For both migrating and copying instances, you don’t need to specify the source remote if it is your default remote, and you can leave out the target instance name if you want to use the same instance name on the target remote server.</p>
<p>If you want to migrate the instance to a specific cluster member, specify that member’s name with the <code class="docutils literal notranslate"><span class="pre">--target</span></code> flag.
In this case, do not specify the source and target remote.</p>
<p>You can add the <code class="docutils literal notranslate"><span class="pre">--mode</span></code> flag to choose a transfer mode, depending on your network setup:</p>
<dl class="simple myst">
<dt><code class="docutils literal notranslate"><span class="pre">pull</span></code> (default)</dt><dd><p>Instruct the target server to connect to the source server and pull the respective instance.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">push</span></code></dt><dd><p>Instruct the source server to connect to the target server and push the instance.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">relay</span></code></dt><dd><p>Instruct the client to connect to both the source and the target server and transfer the data through the client.</p>
</dd>
</dl>
<p>If you need to adapt the configuration for the instance to run on the target server, you can either specify the new configuration directly (using <code class="docutils literal notranslate"><span class="pre">--config</span></code>, <code class="docutils literal notranslate"><span class="pre">--device</span></code>, <code class="docutils literal notranslate"><span class="pre">--storage</span></code> or <code class="docutils literal notranslate"><span class="pre">--target-project</span></code>) or through profiles (using <code class="docutils literal notranslate"><span class="pre">--no-profiles</span></code> or <code class="docutils literal notranslate"><span class="pre">--profile</span></code>). See <a class="reference internal" href="../../reference/manpages/lxc/move/#lxc-move-md"><span class="std std-ref"><code class="docutils literal notranslate"><span class="pre">lxc</span> <span class="pre">move</span> <span class="pre">--help</span></code></span></a> for all available flags.</p>
</section>
<section id="live-migration">
<span id="id1"></span><h2>Live migration<a class="headerlink" href="#live-migration" title="Link to this heading">¶</a></h2>
<p>Live migration means migrating an instance to another server while it is running, avoiding any downtime. This method is supported for virtual machines.</p>
<p>For a virtual machine to be eligible for live migration, it must meet the following criteria:</p>
<ul>
<li><p>It must have support for stateful migration enabled. To enable this, set <a class="configref reference internal" href="../../reference/instance_options/#instance-migration:migration.stateful"><code class="docutils literal notranslate"><span class="pre">migration.stateful</span></code></a> to <code class="docutils literal notranslate"><span class="pre">true</span></code> on the virtual machine. This setting can only be updated when the machine is stopped. Thus, be sure to configure this setting before you need to live-migrate:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">lxc</span> <span class="n">config</span> <span class="nb">set</span> <span class="o"><</span><span class="n">instance</span><span class="o">-</span><span class="n">name</span><span class="o">></span> <span class="n">migration</span><span class="o">.</span><span class="n">stateful</span><span class="o">=</span><span class="n">true</span>
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>When <a class="configref reference internal" href="../../reference/instance_options/#instance-migration:migration.stateful"><code class="docutils literal notranslate"><span class="pre">migration.stateful</span></code></a> is enabled in LXD, virtiofs shares are disabled, and files are only shared via the 9P protocol. Consequently, guest OSes lacking 9P support, such as CentOS 8, cannot share files with the host unless stateful migration is disabled. Additionally, the <code class="docutils literal notranslate"><span class="pre">lxd-agent</span></code> will not function for these guests under these conditions.</p>
</div>
</li>
<li><p>When using a local pool, the <a class="configref reference internal" href="../../reference/devices_disk/#device-disk-device-conf:size.state"><code class="docutils literal notranslate"><span class="pre">size.state</span></code></a> of the virtual machine’s root disk device must be set to at least the size of the virtual machine’s <a class="configref reference internal" href="../../reference/instance_options/#instance-resource-limits:limits.memory"><code class="docutils literal notranslate"><span class="pre">limits.memory</span></code></a> setting.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>If you are using a remote storage pool like Ceph RBD to back your instance, you don’t need to set <a class="configref reference internal" href="../../reference/devices_disk/#device-disk-device-conf:size.state"><code class="docutils literal notranslate"><span class="pre">size.state</span></code></a> to perform live migration.</p>
</div>
</li>
<li><p>The virtual machine must not depend on any resources specific to its current host, such as local storage or a local (non-OVN) bridge network.</p></li>
</ul>
</section>
<section id="temporarily-migrate-all-instances-from-a-cluster-member">
<h2>Temporarily migrate all instances from a cluster member<a class="headerlink" href="#temporarily-migrate-all-instances-from-a-cluster-member" title="Link to this heading">¶</a></h2>
<p>For LXD servers that are members of a cluster, you can use the evacuate and restore operations to temporarily migrate all instances from one cluster member to another. These operations can also live-migrate eligible instances.</p>
<p>For more information, see: <a class="reference internal" href="../cluster_manage/#cluster-evacuate-restore"><span class="std std-ref">Evacuate and restore cluster members</span></a>.</p>
</section>
<section id="related-topics">
<h2>Related topics<a class="headerlink" href="#related-topics" title="Link to this heading">¶</a></h2>
<p>How-to guides:</p>
<ul class="simple">
<li><p><a class="reference internal" href="../cluster_manage_instance/#howto-cluster-manage-instance-migrate"><span class="std std-ref">Migrate instances in a cluster</span></a></p></li>
<li><p><a class="reference internal" href="../projects_work/#howto-projects-work-move-instance"><span class="std std-ref">Move an instance to another project</span></a></p></li>
<li><p><a class="reference internal" href="../import_machines_to_instances/#import-machines-to-instances"><span class="std std-ref">Import machines to LXD instances</span></a></p></li>
<li><p><a class="reference internal" href="../../backup/#secondary-backup-server"><span class="std std-ref">Secondary backup LXD server</span></a></p></li>
<li><p><a class="reference internal" href="../instances_backup/#instances-backup-export-instance"><span class="std std-ref">Export an instance</span></a></p></li>
<li><p><a class="reference internal" href="../instances_backup/#instances-backup-import-instance"><span class="std std-ref">Restore an instance from an export file</span></a></p></li>
<li><p><a class="reference internal" href="../storage_move_volume/#howto-storage-move-volume"><span class="std std-ref">Move or copy storage volumes</span></a></p></li>
</ul>
</section>
</section>
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<ul>
<li><a class="reference internal" href="#">How to migrate LXD instances between servers</a><ul>
<li><a class="reference internal" href="#migrate-instances">Migrate instances</a></li>
<li><a class="reference internal" href="#copy-instances">Copy instances</a></li>
<li><a class="reference internal" href="#migrate-and-copy-options">Migrate and copy options</a></li>
<li><a class="reference internal" href="#live-migration">Live migration</a></li>
<li><a class="reference internal" href="#temporarily-migrate-all-instances-from-a-cluster-member">Temporarily migrate all instances from a cluster member</a></li>
<li><a class="reference internal" href="#related-topics">Related topics</a></li>
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<ul><li><a href="https://discuss.linuxcontainers.org/t/16635" target="_blank">Online VM live-migration (QEMU to QEMU)</a></li></ul>
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