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<h1>Configure system logs on Arch to avoid filled up disk</h1>
<p>It’s been a while since I’ve been running a minimal server on a VPS, and it is a pretty humble VPS with just 32 GB of storage which works for me as I’m only hosting a handful of services. At some point I started noticing that the disk keept filling up on each time I checked.</p>
<p>Turns out that out of the box, Arch has a default config for <code>systemd</code>‘s <code>journald</code> that keeps a persistent <code>journal</code> log, but doesn’t have a limit on how much logging is kept. This means that depending on how many services, and how aggresive they log, it can be filled up pretty quickly. For me I had around 15 GB of logs, from the normal <code>journal</code> directory, <code>nginx</code> directory and my now unused <code>prosody</code> instance.</p>
<p>For <code>prosody</code> it was just a matter of deleting the directory as I’m not using it anymore, which freed around 4 GB of disk space.
For <code>journal</code> I did a combination of configuring <code>SystemMaxUse</code> and creating a <em>Namespace</em> for all “email” related services as mentioned in the <a href="https://wiki.archlinux.org/title/Systemd/Journal#Per_unit_size_limit_by_a_journal_namespace">Arch wiki: systemd/Journal</a>; basically just configuring <code>/etc/systemd/journald.conf</code> (and <code>/etc/systemd/journald@email.con</code> with the comment change) with:</p>
<pre><code class="language-conf">[Journal]
Storage=persistent
SystemMaxUse=100MB # 50MB for the "email" Namespace
</code></pre>
<p>And then for each service that I want to use this “email” <em>Namespace</em> I add:</p>
<pre><code class="language-conf">[Service]
LogNamespace=email
</code></pre>
<p>Which can be changed manually or by executing <code>systemctl edit service_name.service</code> and it will create an override file which will be read on top of the normal service configuration. Once configured restart by running <code>systemctl daemon-reload</code> and <code>systemctl restart service_name.service</code> (probably also restart <code>systemd-journald</code>).</p>
<p>I also disabled the logging for <code>ufw</code> by running <code>ufw logging off</code> as it logs everything to the <code>kernel</code> “unit”, and I didn’t find a way to pipe its logs to a separate directory. It really isn’t that useful as most of the logs are the normal <code>[UFW BLOCK]</code> log, which is normal. If I need debugging then I’ll just enable that again. Note that you can change the logging level, if you still want some kind of logging.</p>
<p>Finally to clean up the <code>nginx</code> logs, you need to install <code>logrotate</code> (<code>pacman -S logrotate</code>) as that is what is used to clean up the <code>nginx</code> log directory. <code>nginx</code> already “installs” a config file for <code>logrotate</code> which is located at <code>/etc/logrotate.d/</code>, I just added a few lines:</p>
<pre><code>/var/log/nginx/*log {
rotate 7
weekly
dateext
dateformat -%Y-%m-%d
missingok
notifempty
create 640 http log
sharedscripts
compress
postrotate
test ! -r /run/nginx.pid || kill -USR1 `cat /run/nginx.pid`
endscript
}
</code></pre>
<p>Once you’re ok with your config, it’s just a matter of running <code>logrotate -v -f /etc/logrotate.d/nginx</code> which forces the run of the rule for <code>nginx</code>. After this, <code>logrotate</code> will be run daily if you <code>enable</code> the <code>logrotate</code> timer: <code>systemctl enable logrotate.timer</code>.</p>
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<p>By David Luévano</p>
<p>Created: Thu, Jun 15, 2023 @ 10:22 UTC</p>
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