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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>systemd-machine-id-commit.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="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 219</span><hr><div class="refentry"><a name="systemd-machine-id-commit.service"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-machine-id-commit.service — Commit transient machine-id to disk</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">systemd-machine-id-commit.service</code></p><p><code class="filename">/usr/lib/systemd/systemd-machine-id-commit</code></p></div><div class="refsect1"><a name="idm140406049307488"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">systemd-machine-id-commit.service</code> is a
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service responsible for committing any transient
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<code class="filename">/etc/machine-id</code> file to a writable file
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system. See
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<a href="machine-id.html"><span class="citerefentry"><span class="refentrytitle">machine-id</span>(5)</span></a>
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for more information about this file.</p><p>This service is started shortly after
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<code class="filename">local-fs.target</code> if
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<code class="filename">/etc/machine-id</code> is an independent mount point
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(probably a tmpfs one) and /etc is writable.
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<span class="command"><strong>systemd-machine-id-commit</strong></span> will then write
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current machine ID to disk and unmount the transient
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<code class="filename">/etc/machine-id</code> file in a race-free manner to
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ensure that file is always valid for other processes.</p><p>Note that the traditional way to initialize the machine ID
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in <code class="filename">/etc/machine-id</code> is to use
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<span class="command"><strong>systemd-machine-id-setup</strong></span> by system installer
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tools. You can also use
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<a href="systemd-firstboot.html"><span class="citerefentry"><span class="refentrytitle">systemd-firstboot</span>(1)</span></a>
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to initialize the machine ID on mounted (but not booted) system
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images. The main use case for that service is
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<code class="filename">/etc/machine-id</code> being an empty file at boot
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and initrd chaining to systemd giving it a read only file system
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that will be turned read-write later during the boot
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process.</p><p>There is no consequence if that service fails other than a
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newer machine-id will be generated during next system boot.
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</p></div><div class="refsect1"><a name="idm140406049296752"></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="systemd-machine-id-commit.html"><span class="citerefentry"><span class="refentrytitle">systemd-machine-id-commit</span>(1)</span></a>,
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<a href="systemd-machine-id-setup.html"><span class="citerefentry"><span class="refentrytitle">systemd-machine-id-setup</span>(1)</span></a>,
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<a href="machine-id.html"><span class="citerefentry"><span class="refentrytitle">machine-id</span>(5)</span></a>,
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<a href="systemd-firstboot.html"><span class="citerefentry"><span class="refentrytitle">systemd-firstboot</span>(1)</span></a>
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</p></div></div></body></html>
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