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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>systemd-machine-id-commit</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"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-machine-id-commit — Commit transient machine ID to /etc/machine-id</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">systemd-machine-id-commit</code> </p></div></div><div class="refsect1"><a name="idm140198987842880"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><span class="command"><strong>systemd-machine-id-commit</strong></span> may be used to
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write on disk any transient machine ID mounted as a temporary file
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system in <code class="filename">/etc/machine-id</code> at boot time. 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 tool will execute no operation if
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<code class="filename">/etc/machine-id</code> doesn't contain any valid
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machine ID, isn't mounted as an independent temporary file system,
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of <code class="filename">/etc</code> is read-only. If those conditions are
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met, it will then write current machine ID to disk and unmount the
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transient <code class="filename">/etc/machine-id</code> file in a race-free
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manner to ensure that this file is always valid for other
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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.</p></div><div class="refsect1"><a name="idm140198987834048"></a><h2 id="Options">Options<a class="headerlink" title="Permalink to this headline" href="#Options">¶</a></h2><p>The following options are understood:</p><div class="variablelist"><dl class="variablelist"><dt id="--root=root"><span class="term"><code class="option">--root=<em class="replaceable"><code>root</code></em></code></span><a class="headerlink" title="Permalink to this term" href="#--root=root">¶</a></dt><dd><p>Takes a directory path
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as an argument. All paths will be
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prefixed with the given alternate
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<em class="replaceable"><code>root</code></em> path,
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including config search paths.
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</p></dd><dt id="-h"><span class="term"><code class="option">-h</code>, </span><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#-h">¶</a></dt><dd><p><a name="help-text"></a>Print a short help text and exit.
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</p></dd><dt id="--version"><span class="term"><code class="option">--version</code></span><a class="headerlink" title="Permalink to this term" href="#--version">¶</a></dt><dd><p><a name="version-text"></a>Print a short version string and exit.</p></dd></dl></div></div><div class="refsect1"><a name="idm140198987828416"></a><h2 id="Exit status">Exit status<a class="headerlink" title="Permalink to this headline" href="#Exit%20status">¶</a></h2><p>On success, 0 is returned, a non-zero failure code
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otherwise.</p></div><div class="refsect1"><a name="idm140198991729776"></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.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-machine-id-commit.service</span>(8)</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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