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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 219</span><hr><div class="refentry"><a name="systemd-halt.service"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-halt.service, systemd-poweroff.service, systemd-reboot.service, systemd-kexec.service, systemd-shutdown — System shutdown logic</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">systemd-halt.service</code></p><p><code class="filename">systemd-poweroff.service</code></p><p><code class="filename">systemd-reboot.service</code></p><p><code class="filename">systemd-kexec.service</code></p><p><code class="filename">/usr/lib/systemd/systemd-shutdown</code></p></div><div class="refsect1"><a name="idm140022452053280"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">systemd-halt.service</code> is a system
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service that is pulled in by <code class="filename">halt.target</code> and
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is responsible for the actual system halt. Similarly,
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<code class="filename">systemd-poweroff.service</code> is pulled in by
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<code class="filename">poweroff.target</code>,
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<code class="filename">systemd-reboot.service</code> by
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<code class="filename">reboot.target</code> and
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<code class="filename">systemd-kexec.service</code> by
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<code class="filename">kexec.target</code> to execute the respective
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actions.</p><p>When these services are run, they ensure that PID 1 is
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replaced by the
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<code class="filename">/usr/lib/systemd/systemd-shutdown</code> tool which
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is then responsible for the actual shutdown. Before shutting down,
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this binary will try to unmount all remaining file systems,
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disable all remaining swap devices, detach all remaining storage
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devices and kill all remaining processes.</p><p>It is necessary to have this code in a separate binary
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because otherwise rebooting after an upgrade might be broken — the
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running PID 1 could still depend on libraries which are not
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available any more, thus keeping the file system busy, which then
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cannot be re-mounted read-only.</p><p>Immediately before executing the actual system
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halt/poweroff/reboot/kexec <code class="filename">systemd-shutdown</code>
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will run all executables in
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<code class="filename">/usr/lib/systemd/system-shutdown/</code> and pass
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one arguments to them: either "<code class="literal">halt</code>",
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"<code class="literal">poweroff</code>", "<code class="literal">reboot</code>" or
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"<code class="literal">kexec</code>", depending on the chosen action. All
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executables in this directory are executed in parallel, and
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execution of the action is not continued before all executables
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finished.</p><p>Note that <code class="filename">systemd-halt.service</code> (and the
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related units) should never be executed directly. Instead, trigger
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system shutdown with a command such as "<code class="literal">systemctl
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halt</code>" or suchlike.</p></div><div class="refsect1"><a name="idm140022455939872"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
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<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
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<a href="systemctl.html"><span class="citerefentry"><span class="refentrytitle">systemctl</span>(1)</span></a>,
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<a href="systemd.special.html"><span class="citerefentry"><span class="refentrytitle">systemd.special</span>(7)</span></a>,
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<a href="http://man7.org/linux/man-pages/man2/reboot.2.html"><span class="citerefentry"><span class="refentrytitle">reboot</span>(2)</span></a>,
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<a href="systemd-suspend.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-suspend.service</span>(8)</span></a>
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</p></div></div></body></html>
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