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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="hostname"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>hostname — Local hostname configuration file</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">/etc/hostname</code></p></div><div class="refsect1"><a name="idm140466949530736"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p>The <code class="filename">/etc/hostname</code> file configures the
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name of the local system that is set during boot using the
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<a href="http://man7.org/linux/man-pages/man2/sethostname.2.html"><span class="citerefentry"><span class="refentrytitle">sethostname</span>(2)</span></a>
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system call. It should contain a single newline-terminated
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hostname string. The hostname may be a free-form string up to 64
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characters in length; however, it is recommended that it consists
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only of 7-bit ASCII lower-case characters and no spaces or dots,
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and limits itself to the format allowed for DNS domain name
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labels, even though this is not a strict requirement.</p><p>Depending on the operating system, other configuration files
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might be checked for configuration of the hostname as well,
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however only as fallback.</p><p>You may use
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<a href="hostnamectl.html"><span class="citerefentry"><span class="refentrytitle">hostnamectl</span>(1)</span></a>
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to change the value of this file during runtime from the command
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line. 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 it on mounted (but not booted) system images.</p></div><div class="refsect1"><a name="idm140466949524832"></a><h2 id="History">History<a class="headerlink" title="Permalink to this headline" href="#History">¶</a></h2><p>The simple configuration file format of
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<code class="filename">/etc/hostname</code> originates from Debian
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GNU/Linux.</p></div><div class="refsect1"><a name="idm140466949522912"></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="http://man7.org/linux/man-pages/man2/sethostname.2.html"><span class="citerefentry"><span class="refentrytitle">sethostname</span>(2)</span></a>,
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<a href="hostname.html"><span class="citerefentry"><span class="refentrytitle">hostname</span>(1)</span></a>,
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<a href="hostname.html"><span class="citerefentry"><span class="refentrytitle">hostname</span>(7)</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="machine-info.html"><span class="citerefentry"><span class="refentrytitle">machine-info</span>(5)</span></a>,
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<a href="hostnamectl.html"><span class="citerefentry"><span class="refentrytitle">hostnamectl</span>(1)</span></a>,
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<a href="systemd-hostnamed.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-hostnamed.service</span>(8)</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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