man/hostname.xml

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<refentry id="hostname">
        <refentryinfo>
                <title>/etc/hostname</title>
                <productname>systemd</productname>

                <authorgroup>
                        <author>
                                <contrib>Developer</contrib>
                                <firstname>Lennart</firstname>
                                <surname>Poettering</surname>
                                <email>lennart@poettering.net</email>
                        </author>
                </authorgroup>
        </refentryinfo>

        <refmeta>
                <refentrytitle>hostname</refentrytitle>
                <manvolnum>5</manvolnum>
        </refmeta>

        <refnamediv>
                <refname>hostname</refname>
                <refpurpose>Local host name configuration file</refpurpose>
        </refnamediv>

        <refsynopsisdiv>
                <para><filename>/etc/hostname</filename></para>
        </refsynopsisdiv>

        <refsect1>
                <title>Description</title>

                <para>The <filename>/etc/hostname</filename> file
                configures the name of the local system that is set
                during boot, with the
                <citerefentry><refentrytitle>sethostname</refentrytitle><manvolnum>2</manvolnum></citerefentry>
                system call. It should contain a single
                newline-terminated host name string. The
                host name may be a free-form string up to 64 characters
                in length, however it is recommended that it consists
                only of 7bit ASCII lower-case characters and no spaces or dots,
                and limits itself to the format allowed for DNS domain
                name labels, even though this is not a
                strict requirement.</para>

                <para>Depending on the operating system other
                configuration files might be checked for configuration
                of the host name as well, however only as fallback.</para>
        </refsect1>

        <refsect1>
                <title>History</title>

                <para>The simple configuration file format of
                <filename>/etc/hostname</filename> originates from
                Debian GNU/Linux.</para>
        </refsect1>

        <refsect1>
                  <title>See Also</title>
                  <para>
                          <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                          <citerefentry><refentrytitle>sethostname</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
                          <citerefentry><refentrytitle>hostname</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                          <citerefentry><refentrytitle>hostname</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
                          <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                          <citerefentry><refentrytitle>machine-info</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                  </para>
        </refsect1>

</refentry>