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<h1 id="migrate-data-between-different-backends">Migrate data between different backends<a class="headerlink" href="#migrate-data-between-different-backends" title="Permanent link">&para;</a></h1>
<p>Seafile supports data migration between filesystem, s3, ceph, swift and Alibaba oss by a built-in script. Before migration, you have to ensure that <strong>both S3 hosts can be accessed normally</strong>.</p>
<div class="admonition warning">
<p class="admonition-title">Migration to or from S3</p>
<p>Since version 11, when you migrate from S3 to other storage servers or from other storage servers to S3, you have to use V4 authentication protocol. This is because version 11 upgrades to Boto3 library, which fails to list objects from S3 when it's configured to use V2 authentication protocol.</p>
</div>
<h2 id="copy-seafileconf-and-use-new-s3-configurations">Copy <code>seafile.conf</code> and use new S3 configurations<a class="headerlink" href="#copy-seafileconf-and-use-new-s3-configurations" title="Permanent link">&para;</a></h2>
<p>During the migration process, Seafile needs to know where the data will be migrated to. The easiest way is to copy the original <code>seafile.conf</code> to a new path, and then use the new S3 configurations in this file.</p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:2"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">Deploy with Docker</label><label for="__tabbed_1_2">Deploy from binary package</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>For deployment with Docker, the new <code>seafile.conf</code> has to <strong>be put in the persistent directory</strong> (e.g., <code>/opt/seafile-data/seafile.conf</code>) used by Seafile service. Otherwise the script cannot locate the new configurations file.</p>
</div>
<div class="highlight"><pre><span></span><code>cp<span class="w"> </span>/opt/seafile-data/seafile/conf/seafile.conf<span class="w"> </span>/opt/seafile-data/seafile.conf
nano<span class="w"> </span>/opt/seafile-data/seafile.conf
</code></pre></div>
</div>
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>cp<span class="w"> </span>/opt/seafile/conf/seafile.conf<span class="w"> </span>/opt/seafile.conf
nano<span class="w"> </span>/opt/seafile.conf
</code></pre></div>
</div>
</div>
</div>
<p>Then you can follow <a href="../setup_with_s3/">here</a> to use the new S3 configurations in the new <code>seafile.conf</code>. By the way, if you want to migrate to a local file system, the new <code>seafile.conf</code> configurations for S3 example is as follows:</p>
<div class="highlight"><pre><span></span><code># ... other configurations
[commit_object_backend]
name = fs
dir = /var/data_backup
[fs_object_backend]
name = fs
dir = /var/data_backup
[block_backend]
name = fs
dir = /var/data_backup
</code></pre></div>
<h2 id="stop-seafile-server">Stop Seafile Server<a class="headerlink" href="#stop-seafile-server" title="Permanent link">&para;</a></h2>
<p>Since the data migration process will not affect the operation of the Seafile service, if the original S3 data is operated during this process, the data may not be synchronized with the migrated data. Therefore, we recommend that you stop the Seafile service before executing the migration procedure.</p>
<div class="tabbed-set tabbed-alternate" data-tabs="2:2"><input checked="checked" id="__tabbed_2_1" name="__tabbed_2" type="radio" /><input id="__tabbed_2_2" name="__tabbed_2" type="radio" /><div class="tabbed-labels"><label for="__tabbed_2_1">Deploy with Docker</label><label for="__tabbed_2_2">Deploy from binary package</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>docker<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>-it<span class="w"> </span>seafile<span class="w"> </span>bash
<span class="nb">cd</span><span class="w"> </span>/opt/seafile/seafile-server-latest
./seahub.sh<span class="w"> </span>stop
./seafile.sh<span class="w"> </span>stop
</code></pre></div>
</div>
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code><span class="nb">cd</span><span class="w"> </span>/opt/seafile/seafile-server-latest
./seahub.sh<span class="w"> </span>stop
./seafile.sh<span class="w"> </span>stop
</code></pre></div>
</div>
</div>
</div>
<h2 id="run-migratesh-to-initially-migrate-objects">Run migrate.sh to initially migrate objects<a class="headerlink" href="#run-migratesh-to-initially-migrate-objects" title="Permanent link">&para;</a></h2>
<p>This step will migrate <strong>most of</strong> objects from the source storage to the destination storage. You don't need to stop Seafile service at this stage as it may take quite long time to finish. Since the service is not stopped, some new objects may be added to the source storage during migration. Those objects will be handled in the next step:</p>
<div class="admonition tip">
<p class="admonition-title">Speed-up migrating large number of objects</p>
<p>If you have millions of objects in the storage (especially the <strong><em>fs</em></strong> objects), it may take quite long time to migrate all objects and more than half is using to check whether an object exists in the destination storage. In this situation, you can modify the <code>nworker</code> and <code>maxsize</code> variables in the <code>migrate.py</code>:</p>
<div class="highlight"><pre><span></span><code><span class="k">class</span><span class="w"> </span><span class="nc">ThreadPool</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">do_work</span><span class="p">,</span> <span class="n">nworker</span><span class="o">=</span><span class="mi">20</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">do_work</span> <span class="o">=</span> <span class="n">do_work</span>
<span class="bp">self</span><span class="o">.</span><span class="n">nworker</span> <span class="o">=</span> <span class="n">nworker</span>
<span class="bp">self</span><span class="o">.</span><span class="n">task_queue</span> <span class="o">=</span> <span class="n">Queue</span><span class="o">.</span><span class="n">Queue</span><span class="p">(</span><span class="n">maxsize</span> <span class="o">=</span> <span class="mi">2000</span><span class="p">)</span>
</code></pre></div>
<p>However, if the two values (i.e., <code>nworker</code> and <code>maxsize</code>) are too large, the improvement in data migration speed may not be obvious because the disk I/O bottleneck has been reached.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Encrypted storage backend data (deprecated)</p>
<p>If you have an encrypted storage backend, you can use this script to migrate and decrypt the data from that backend to a new one. You can add the <code>--decrypt</code> option in calling the script, which will decrypt the data while reading it, and then write the unencrypted data to the new backend:</p>
<div class="highlight"><pre><span></span><code>./migrate.sh<span class="w"> </span>/opt<span class="w"> </span>--decrypt
</code></pre></div>
</div>
<div class="tabbed-set tabbed-alternate" data-tabs="3:2"><input checked="checked" id="__tabbed_3_1" name="__tabbed_3" type="radio" /><input id="__tabbed_3_2" name="__tabbed_3" type="radio" /><div class="tabbed-labels"><label for="__tabbed_3_1">Deploy with Docker</label><label for="__tabbed_3_2">Deploy from binary package</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code><span class="c1"># make sure you are in the container and in directory `/opt/seafile/seafile-server-latest`</span>
./migrate.sh<span class="w"> </span>/shared
<span class="c1"># exit container and stop it</span>
<span class="nb">exit</span>
docker<span class="w"> </span>compose<span class="w"> </span>down
</code></pre></div>
</div>
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code><span class="c1"># make sure you are in the directory `/opt/seafile/seafile-server-latest`</span>
./migrate.sh<span class="w"> </span>/opt
</code></pre></div>
</div>
</div>
</div>
<div class="admonition success">
<p class="admonition-title">Success</p>
<p>You can see the following message if the migration process is done:</p>
<div class="highlight"><pre><span></span><code>2025-01-15 05:49:39,408 Start to fetch [commits] object from destination
2025-01-15 05:49:39,422 Start to fetch [fs] object from destination
2025-01-15 05:49:39,442 Start to fetch [blocks] object from destination
2025-01-15 05:49:39,677 [commits] [0] objects exist in destination
2025-01-15 05:49:39,677 Start to migrate [commits] object
2025-01-15 05:49:39,749 [blocks] [0] objects exist in destination
2025-01-15 05:49:39,755 Start to migrate [blocks] object
2025-01-15 05:49:39,752 [fs] [0] objects exist in destination
2025-01-15 05:49:39,762 Start to migrate [fs] object
2025-01-15 05:49:40,602 Complete migrate [commits] object
2025-01-15 05:49:40,626 Complete migrate [blocks] object
2025-01-15 05:49:40,790 Complete migrate [fs] object
Done.
</code></pre></div>
</div>
<h2 id="replace-the-original-seafileconf-and-start-seafile">Replace the original <code>seafile.conf</code> and start Seafile<a class="headerlink" href="#replace-the-original-seafileconf-and-start-seafile" title="Permanent link">&para;</a></h2>
<p>After running the script, we recommend that you check whether your data already exists on the new S3 storage backend server (i.e., the migration is successful, and the number and size of files should be the same). Then you can remove the file from the old S3 storage backend and replace the original <code>seafile.conf</code> from the new one:</p>
<div class="tabbed-set tabbed-alternate" data-tabs="4:2"><input checked="checked" id="__tabbed_4_1" name="__tabbed_4" type="radio" /><input id="__tabbed_4_2" name="__tabbed_4" type="radio" /><div class="tabbed-labels"><label for="__tabbed_4_1">Deploy with Docker</label><label for="__tabbed_4_2">Deploy from binary package</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>mv<span class="w"> </span>/opt/seafile-data/seafile.conf<span class="w"> </span>/opt/seafile-data/seafile/conf/seafile.conf
</code></pre></div>
</div>
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>mv<span class="w"> </span>/opt/seafile.conf<span class="w"> </span>/opt/seafile/conf/seafile.conf
</code></pre></div>
</div>
</div>
</div>
<p>Finally, you can start Seafile server:</p>
<div class="tabbed-set tabbed-alternate" data-tabs="5:2"><input checked="checked" id="__tabbed_5_1" name="__tabbed_5" type="radio" /><input id="__tabbed_5_2" name="__tabbed_5" type="radio" /><div class="tabbed-labels"><label for="__tabbed_5_1">Deploy with Docker</label><label for="__tabbed_5_2">Deploy from binary package</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>docker<span class="w"> </span>compose<span class="w"> </span>up<span class="w"> </span>-d
</code></pre></div>
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<div class="tabbed-block">
<div class="highlight"><pre><span></span><code><span class="c1"># make sure you are in the directory `/opt/seafile/seafile-server-latest`</span>
./seahub.sh<span class="w"> </span>start
./seafile.sh<span class="w"> </span>start
</code></pre></div>
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