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<a href="systemd.directives.html">Directives </a>·
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<a href="../python-systemd/index.html">Python </a>·
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<a href="../libudev/index.html">libudev </a>·
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<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 218</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="idm139801696152736"></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
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system service that is pulled in by
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<code class="filename">halt.target</code> and is responsible
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for the actual system halt. Similarly,
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<code class="filename">systemd-poweroff.service</code> is
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pulled in by <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
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respective actions.</p><p>When these services are run, they ensure that PID
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1 is replaced by the
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<code class="filename">/usr/lib/systemd/systemd-shutdown</code>
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tool which is then responsible for the actual
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shutdown. Before shutting down, this binary will try to
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unmount all remaining file systems, disable all
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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 —
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the 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
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then cannot be re-mounted read-only.</p><p>Immediately before executing the actual system
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halt/poweroff/reboot/kexec
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<code class="filename">systemd-shutdown</code> will run all
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executables in
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<code class="filename">/usr/lib/systemd/system-shutdown/</code>
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and pass one arguments to them: either
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"<code class="literal">halt</code>",
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"<code class="literal">poweroff</code>",
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"<code class="literal">reboot</code>" or
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"<code class="literal">kexec</code>", depending on the chosen
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action. All executables in this directory are executed
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in parallel, and execution of the action is not
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continued before all executables finished.</p><p>Note that
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<code class="filename">systemd-halt.service</code> (and the
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related units) should never be executed
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directly. Instead, trigger system shutdown with a
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command such as "<code class="literal">systemctl halt</code>" or
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suchlike.</p></div><div class="refsect1"><a name="idm139801700089120"></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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