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Mirror Manager
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<h1>Mirror Manager</h1>
<p>This SOP contains most if not all the information needed for SIG/Core to
maintain and operate Mirror Manager for Rocky Linux.</p>
<h2 id="contact-information">Contact Information<a class="headerlink" href="#contact-information" title="Permanent link">&para;</a></h2>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>Owner</strong></td>
<td>SIG/Core (Release Engineering &amp; Infrastructure)</td>
</tr>
<tr>
<td><strong>Email Contact</strong></td>
<td>infrastructure@rockylinux.org</td>
</tr>
<tr>
<td><strong>Email Contact</strong></td>
<td>releng@rockylinux.org</td>
</tr>
<tr>
<td><strong>Mattermost Contacts</strong></td>
<td><code>@label</code> <code>@neil</code> <code>@tgo</code></td>
</tr>
<tr>
<td><strong>Mattermost Channels</strong></td>
<td><code>~Infrastructure</code></td>
</tr>
</tbody>
</table>
<h2 id="introduction">Introduction<a class="headerlink" href="#introduction" title="Permanent link">&para;</a></h2>
<p>So you made a bad decision and now have to do things to Mirror Manager. Good
luck.</p>
<h2 id="pieces">Pieces<a class="headerlink" href="#pieces" title="Permanent link">&para;</a></h2>
<table>
<thead>
<tr>
<th><strong>Item</strong></th>
<th>Runs on...</th>
<th>Software</th>
</tr>
</thead>
<tbody>
<tr>
<td>Mirrorlist Server</td>
<td>mirrormanager001</td>
<td>https://github.com/adrianreber/mirrorlist-server/</td>
</tr>
<tr>
<td>Mirror Manager 2</td>
<td>mirrormanager001</td>
<td>https://github.com/fedora-infra/mirrormanager2</td>
</tr>
</tbody>
</table>
<h3 id="mirrorlist-server">Mirrorlist Server<a class="headerlink" href="#mirrorlist-server" title="Permanent link">&para;</a></h3>
<p>This runs two (2) instances. Apache/httpd is configured to send <code>/mirrorlist</code>
to one and <code>/debuglist</code> to the other.</p>
<ul>
<li>
<p>Every fifteen (15) minutes: Mirrorlist cache is regenerated</p>
<ul>
<li>This queries the database for active mirrors and other information and writes a protobuf. The mirrorlist-server reads the protobuf and responds accordingly.</li>
</ul>
</li>
<li>
<p>Every twenty (20) minutes: Service hosting <code>/mirrorlist</code> is restarted</p>
</li>
<li>Every twenty-one (21) minutes: Service hosting <code>/debuglist</code> is restarted</li>
</ul>
<p>Note that the timing for the restart of the mirror list instances are arbitrary.</p>
<h3 id="mirror-manager-2">Mirror Manager 2<a class="headerlink" href="#mirror-manager-2" title="Permanent link">&para;</a></h3>
<p>This is a uwsgi service fronted by an apache/httpd instance. This is responsible
for everything else that is not <code>/mirrorlist</code> or <code>/debuglist</code>. This allows the
mirror managers to, well, manage their mirrors.</p>
<h3 id="cdn">CDN<a class="headerlink" href="#cdn" title="Permanent link">&para;</a></h3>
<p>Fastly sits in front of mirror manager. VPN is required to access the <code>/admin</code> endpoints.</p>
<p>If the backend of the CDN is down, it will attempt to guess what the user wanted to access and spit out a result on the dl.rockylinux.org website. For example, a request for AppStream-8 and x86_64 will result in a <code>AppStream/x86_64/os</code> directory on dl.rockylinux.org. Note that this isn't perfect, but it helps in potential down time or patching.</p>
<div class="highlight"><pre><span></span><code>Fastly -&gt; www firewall -&gt; mirrormanager server
</code></pre></div>
<p>In reality, the flow is a lot more complex, and a diagram should be created to map it out in a more user-friendly manner (@TODO)</p>
<div class="highlight"><pre><span></span><code>User -&gt; Fastly -&gt; AWS NLB over TLS, passthru -&gt; www firewall cluster (decrypt TLS) -&gt; mirrormanager server (Rocky CA TLS)
</code></pre></div>
<h2 id="tasks">Tasks<a class="headerlink" href="#tasks" title="Permanent link">&para;</a></h2>
<p>Below are a list of possible tasks to take with mirror manager, depending on the scenario.</p>
<h3 id="new-release">New Release<a class="headerlink" href="#new-release" title="Permanent link">&para;</a></h3>
<p>For the following steps, the following must be completed:</p>
<ul>
<li>Production rsync endpoints should have all brand new content</li>
<li>New content root should be locked down to 750 (without this, mirror manager cannot view it)</li>
<li>
<p>Disable mirrormanager user cronjobs</p>
</li>
<li>
<p>Update the database with the new content. This is run on a schedule normally (see previous section) but can be done manually.</p>
<p>a. As the mirror manager user, run the following:</p>
</li>
</ul>
<div class="highlight"><pre><span></span><code>/opt/mirrormanager/scan-primary-mirror-0.4.2/target/debug/scan-primary-mirror --debug --config $HOME/scan-primary-mirror.toml --category &#39;Rocky Linux&#39;
/opt/mirrormanager/scan-primary-mirror-0.4.2/target/debug/scan-primary-mirror --debug --config $HOME/scan-primary-mirror.toml --category &#39;Rocky Linux SIGs&#39;
</code></pre></div>
<ol>
<li>
<p>Update the redirects for <code>$reponame-$releasever</code></p>
<p>a. Use psql to mirrormanager server: <code>psql -U mirrormanager -W -h mirrormanager_db_host mirrormanager_db</code>
b. Confirm that all three columns are filled and that the second and third columns are identical: <code>select rr.from_repo AS "From Repo", rr.to_repo AS "To Repo", r.prefix AS "Target Repo" FROM repository_redirect AS rr LEFT JOIN repository AS r ON rr.to_repo = r.prefix GROUP BY r.prefix, rr.to_repo, rr.from_repo ORDER BY r.prefix ASC;</code>
c. Change the <code>majorversion</code> redirects to point to the new point release, for example: <code>update repository_redirect set to_repo = regexp_replace(to_repo, '9\.0', '9.1') where from_repo ~ '(\w+)-9';</code></p>
</li>
<li>
<p>Generate the mirrorlist cache and restart the debuglist and verify.</p>
</li>
</ol>
<p>Once the bitflip is initiated, restart mirrorlist and reenable all cronjobs.</p>
<h3 id="out-of-date-mirrors">Out-of-date Mirrors<a class="headerlink" href="#out-of-date-mirrors" title="Permanent link">&para;</a></h3>
<ol>
<li>Get current shasum of repomd.xml. For example: <code>shasum=$(curl https://dl.rockylinux.org/pub/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml | sha256sum)</code></li>
<li>Compare against latest propagation log:</li>
</ol>
<div class="highlight"><pre><span></span><code>tail -latr /var/log/mirrormanager/propagation/rocky-9.0-BaseOS-x86_64_propagation.log.*`
export VER=9.0
awk -v shasum=$(curl -s https://dl.rockylinux.org/pub/rocky/$VER/BaseOS/x86_64/os/repodata/repomd.xml | sha256sum | awk &#39;{print $1}&#39;) -F&#39;::&#39; &#39;{split($0,data,&quot;:&quot;)} {if ($4 != shasum) {print data[5], data[6], $2, $7}}&#39; &lt; $(find /var/log/mirrormanager/propagation/ -name &quot;rocky-${VER}-BaseOS-x86_64_propagation.log*&quot; -mtime -1 | tail -1)&#39;
</code></pre></div>
<p>This will generate a table. You can take the IDs in the first column and use the database to disable them by ID (table name: hosts) or go to https://mirrors.rockylinux.org/mirrormanager/host/ID and uncheck 'User active'.</p>
<p>Users can change user active, <em>but</em> they cannot change admin active. It is better to flip user active in this case.</p>
<p>Admins can also view https://mirrors.rockylinux.org/mirrormanager/admin/all_sites if necessary.</p>
<p>Example of table columns:</p>
<div class="highlight"><pre><span></span><code>[mirrormanager@ord1-prod-mirrormanager001 propagation]$ awk -v shasum=$(curl -s https://dl.rockylinux.org/pub/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml | sha256sum | awk &#39;{print $1}&#39;) -F&#39;::&#39; &#39;{split($0,data,&quot;:&quot;)} {if ($4 != shasum) {print data[5], data[6], $2, $7}}&#39; &lt; rocky-9.0-BaseOS-x86_64_propagation.log.1660611632 | column -t
164 mirror.host.ag http://mirror.host.ag/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml 404
173 rocky.centos-repo.net http://rocky.centos-repo.net/9.0/BaseOS/x86_64/os/repodata/repomd.xml 403
92 rocky.mirror.co.ge http://rocky.mirror.co.ge/9.0/BaseOS/x86_64/os/repodata/repomd.xml 404
289 mirror.vsys.host http://mirror.vsys.host/rockylinux/9.0/BaseOS/x86_64/os/repodata/repomd.xml 404
269 mirrors.rackbud.com http://mirrors.rackbud.com/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml 200
295 mirror.ps.kz http://mirror.ps.kz/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml 200
114 mirror.liteserver.nl http://rockylinux.mirror.liteserver.nl/9.0/BaseOS/x86_64/os/repodata/repomd.xml 200
275 mirror.upsi.edu.my http://mirror.upsi.edu.my/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml 200
190 mirror.kku.ac.th http://mirror.kku.ac.th/rocky-linux/9.0/BaseOS/x86_64/os/repodata/repomd.xml 404
292 mirrors.cat.pdx.edu http://mirrors.cat.pdx.edu/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml 200
370 mirrors.gbnetwork.com http://mirrors.gbnetwork.com/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml 404
308 mirror.ihost.md http://mirror.ihost.md/rockylinux/9.0/BaseOS/x86_64/os/repodata/repomd.xml 404
87 mirror.freedif.org http://mirror.freedif.org/Rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml 404
194 mirrors.bestthaihost.com http://mirrors.bestthaihost.com/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml 404
30 mirror.admax.se http://mirror.admax.se/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml 200
195 mirror.uepg.br http://mirror.uepg.br/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml 404
247 mirrors.ipserverone.com http://mirrors.ipserverone.com/rocky/9.0/BaseOS/x86_64/os/repodata/repomd.xml 404&#39;
</code></pre></div>
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