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authorjohannst <johannst@users.noreply.github.com>2022-03-15 17:05:22 +0000
committerjohannst <johannst@users.noreply.github.com>2022-03-15 17:05:22 +0000
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+ <h1><a class="header" href="#systemd" id="systemd">systemd</a></h1>
+<h2><a class="header" href="#systemctl" id="systemctl">systemctl</a></h2>
+<p>Inspect units:</p>
+<pre><code class="language-text">systemctl [opts] [cmd]
+[opts]
+ --user
+
+[cmd]
+ list-units &lt;pattern&gt; List units in memory
+
+ status &lt;unit&gt; Show runtime status of unit
+
+ start &lt;unit&gt; Start a unit
+ stop &lt;unit&gt; Stop a unit
+ restart &lt;unit&gt; Restart a unit
+ reload &lt;unit&gt; Reload a unit
+
+ enable &lt;unit&gt; Enable a unit (persistent)
+ disable &lt;unit&gt; Disable a unit
+
+ cat &lt;unit&gt; Print unit file
+ show &lt;unit&gt; Show properties of unit
+</code></pre>
+<h3><a class="header" href="#example-trivial-user-unit" id="example-trivial-user-unit">Example: Trivial user unit</a></h3>
+<pre><code class="language-bash"># Generate unit
+mkdir -p ~/.config/systemd/user
+echo '[Unit]
+Description=Test logger
+
+[Service]
+Type=oneshot
+ExecStart=logger &quot;Hello from test unit&quot;' &gt; ~/.config/systemd/user/test.service
+
+# Run unit
+systemctl --user start test
+
+# See log message
+journalctl --user -u test -n 5
+</code></pre>
+<h2><a class="header" href="#journalctl" id="journalctl">journalctl</a></h2>
+<p>Inspect journal logs:</p>
+<pre><code class="language-text">journalctl [opts] [matches]
+ --user Current user journal (system by default)
+ -u &lt;unit&gt; Show logs for specified &lt;unit&gt;
+ -n &lt;lines&gt; Show only last &lt;lines&gt;
+ -f Follow journal
+ -g &lt;pattern&gt; Grep for &lt;pattern&gt;
+</code></pre>
+<p>Cleanup:</p>
+<pre><code class="language-text">journalctl [opts]
+ --disk-usage Show current disk usage
+ --vacuum-size=&lt;size&gt; Reduce journal log to &lt;size&gt; (K/M/G)
+</code></pre>
+<h2><a class="header" href="#references" id="references">References</a></h2>
+<ul>
+<li><a href="https://www.man7.org/linux/man-pages/man5/systemd.unit.5.html">man systemd.unit(5)</a></li>
+<li><a href="https://www.man7.org/linux/man-pages/man5/systemd.service.5.html">man systemd.service(5)</a></li>
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