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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>systemd-halt.service</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style>
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</style><a href="index.html">Index </a>·
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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 204</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="idm259768592160"></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 service that is pulled in by
<code class="filename">halt.target</code> and is responsible
for the actual system halt. Similar,
<code class="filename">systemd-poweroff.service</code> is
pulled in by <code class="filename">poweroff.target</code>,
<code class="filename">systemd-reboot.service</code> by
<code class="filename">reboot.target</code> and
<code class="filename">systemd-kexec.service</code> by
<code class="filename">kexec.target</code> to execute the
respective actions.</p><p>When these services are run they ensure that PID
1 is replaced by the
<code class="filename">/usr/lib/systemd/systemd-shutdown</code>
tool which is then responsible for the actual
shutdown. Before shutting down this binary will try to
unmount all remaining file systems, disable all
remaining swap devices, detach all remaining storage
devices and kill all remaining processes.</p><p>Immediately before executing the actual system
halt/poweroff/reboot/kexec
<code class="filename">systemd-shutdown</code> will run all
executables in
<code class="filename">/usr/lib/systemd/system-shutdown/</code>
and pass one arguments to them: either
"<code class="literal">halt</code>",
"<code class="literal">poweroff</code>",
"<code class="literal">reboot</code>" or
"<code class="literal">kexec</code>", depending on the chosen
action. All executables in this directory are executed
in parallel, and execution of the action is not
continued before all executables finished.</p><p>Note that
<code class="filename">systemd-halt.service</code> (and the
related units) should never be executed
directly. Instead, trigger system shutdown with a
command such as "<code class="literal">systemctl halt</code>" or
suchlike.</p></div><div class="refsect1"><a name="idm259768653216"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
<a href="systemctl.html"><span class="citerefentry"><span class="refentrytitle">systemctl</span>(1)</span></a>,
<a href="systemd.special.html"><span class="citerefentry"><span class="refentrytitle">systemd.special</span>(7)</span></a>,
<a href="reboot.html"><span class="citerefentry"><span class="refentrytitle">reboot</span>(2)</span></a>,
<a href="systemd-suspend.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-suspend.service</span>(8)</span></a>
</p></div></div></body></html>
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