systemd/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 characters and no spaces or dots,
                and limit itself to the format allowed for DNS domain
                name labels, even though this is not a
                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>
                  </para>
        </refsect1>

</refentry>