https://meski.io/tags/rctl/ Recent content in Rctl on Artur Meski Hugo en-gb Fri, 09 Sep 2022 00:00:00 +0000 https://meski.io/posts/rctl/ Fri, 09 Sep 2022 00:00:00 +0000 https://meski.io/posts/rctl/ <h1 id="what-is-rctl">What is <code>rctl</code></h1> <p>In FreeBSD, in addition to <code>login.conf</code>, we also get a very nice and flexible mechanism for setting resource limits: <code>rctl</code>. I like it in particular for limiting resources allocated to each jail.</p> <h1 id="configuration">Configuration</h1> <p>Here is a short example:</p> <pre tabindex="0"><code>jail:example_jail:vmemoryuse:deny=2G/jail jail:example_jail:maxproc:deny=200/jail jail:example_jail:readiops:throttle=500/jail jail:example_jail:pcpu:deny=70/jail </code></pre><p>In the above, for the jail identified by <code>example_jail</code> we allow:</p> <ul> <li>2G of memory,</li> <li>200 processes,</li> <li>500 I/O read operations per second,</li> <li>70% of CPU.</li> </ul> <h1 id="enabling-rctl-on-boot">Enabling rctl on boot</h1> <p>Actually, there is no need to enable anything in <code>rc.conf</code> &ndash; this is what you can find in <code>/etc/defaults/rc.conf</code>:</p>