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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 208</span><hr><div class="refentry"><a name="sysctl.d"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sysctl.d — Configure kernel parameters at boot</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">/etc/sysctl.d/*.conf</code></p><p><code class="filename">/run/sysctl.d/*.conf</code></p><p><code class="filename">/usr/lib/sysctl.d/*.conf</code></p></div><div class="refsect1"><a name="idm274685470848"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p>At boot,
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<a href="systemd-sysctl.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-sysctl.service</span>(8)</span></a>
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reads configuration files from the above directories
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to configure
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<a href="sysctl.html"><span class="citerefentry"><span class="refentrytitle">sysctl</span>(8)</span></a>
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kernel parameters.</p></div><div class="refsect1"><a name="idm274685467792"></a><h2 id="Configuration Format">Configuration Format<a class="headerlink" title="Permalink to this headline" href="#Configuration%20Format">¶</a></h2><p>The configuration files contain a list of
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variable assignments, separated by newlines. Empty
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lines and lines whose first non-whitespace character
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is # or ; are ignored.</p><p>Note that both / and . are accepted as label
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separators within sysctl variable
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names. "<code class="literal">kernel.domainname=foo</code>" and
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"<code class="literal">kernel/domainname=foo</code>" hence are
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entirely equivalent.</p><p>Each configuration file shall be named in the
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style of <code class="filename"><em class="replaceable"><code>program</code></em>.conf</code>.
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Files in <code class="filename">/etc/</code> override files
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with the same name in <code class="filename">/usr/lib/</code>
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and <code class="filename">/run/</code>. Files in
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<code class="filename">/run/</code> override files with the same
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name in <code class="filename">/usr/lib/</code>. Packages
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should install their configuration files in
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<code class="filename">/usr/lib/</code>. Files in
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<code class="filename">/etc/</code> are reserved for the local
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administrator, who may use this logic to override the
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configuration files installed by vendor packages. All
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configuration files are sorted by their filename in
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lexicographic order, regardless in which of the
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directories they reside. If multiple files specify the
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same variable name, the entry in the file with the
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lexicographically latest name will be applied. It is
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recommended to prefix all filenames with a two-digit
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number and a dash, to simplify the ordering of the
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files.</p><p>If the administrator wants to disable a
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configuration file supplied by the vendor, the
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recommended way is to place a symlink to
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<code class="filename">/dev/null</code> in
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<code class="filename">/etc/sysctl.d/</code> bearing the
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same filename.</p></div><div class="refsect1"><a name="idm274689353296"></a><h2 id="Example">Example<a class="headerlink" title="Permalink to this headline" href="#Example">¶</a></h2><div class="example"><a name="idm274689352624"></a><p class="title"><b>Example 1. /etc/sysctl.d/domain-name.conf example:</b></p><div class="example-contents"><pre class="programlisting"># Set kernel YP domain name
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kernel.domainname=example.com</pre></div></div><br class="example-break"></div><div class="refsect1"><a name="idm274689351024"></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-sysctl.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-sysctl.service</span>(8)</span></a>,
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<a href="systemd-delta.html"><span class="citerefentry"><span class="refentrytitle">systemd-delta</span>(1)</span></a>,
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<a href="sysctl.html"><span class="citerefentry"><span class="refentrytitle">sysctl</span>(8)</span></a>,
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<a href="sysctl.conf.html"><span class="citerefentry"><span class="refentrytitle">sysctl.conf</span>(5)</span></a>
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</p></div></div></body></html>
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