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  Copyright 2012 Lennart Poettering

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<refentry id="hostnamectl" conditional='ENABLE_HOSTNAMED'
    xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>hostnamectl</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>hostnamectl</refentrytitle>
    <manvolnum>1</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>hostnamectl</refname>
    <refpurpose>Control the system hostname</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>hostnamectl</command>
      <arg choice="opt" rep="repeat">OPTIONS</arg>
      <arg choice="req">COMMAND</arg>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><command>hostnamectl</command> may be used to query and
    change the system hostname and related settings.</para>

    <para>This tool distinguishes three different hostnames: the
    high-level "pretty" hostname which might include all kinds of
    special characters (e.g. "Lennart's Laptop"), the static hostname
    which is used to initialize the kernel hostname at boot (e.g.
    "lennarts-laptop"), and the transient hostname which is a default
    received from network configuration. If a static hostname is set,
    and is valid (something other than localhost), then the transient
    hostname is not used.</para>

    <para>Note that the pretty hostname has little restrictions on the
    characters used, while the static and transient hostnames are
    limited to the usually accepted characters of Internet domain
    names.</para>

    <para>The static hostname is stored in
    <filename>/etc/hostname</filename>, see
    <citerefentry><refentrytitle>hostname</refentrytitle><manvolnum>5</manvolnum></citerefentry>
    for more information. The pretty hostname, chassis type, and icon
    name are stored in <filename>/etc/machine-info</filename>, see
    <citerefentry><refentrytitle>machine-info</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>

    <para>Use
    <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
    to initialize the system host name for mounted (but not booted)
    system images.</para>
  </refsect1>

  <refsect1>
    <title>Options</title>

    <para>The following options are understood:</para>

    <variablelist>
      <varlistentry>
        <term><option>--no-ask-password</option></term>

        <listitem><para>Do not query the user for authentication for
        privileged operations.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--static</option></term>
        <term><option>--transient</option></term>
        <term><option>--pretty</option></term>

        <listitem><para>If <command>status</command> is used (or no
        explicit command is given) and one of those fields is given,
        <command>hostnamectl</command> will print out just this
        selected hostname.</para>

        <para>If used with <command>set-hostname</command>, only the
        selected hostname(s) will be updated. When more than one of
        those options is used, all the specified hostnames will be
        updated. </para></listitem>
      </varlistentry>

      <xi:include href="user-system-options.xml" xpointer="host" />
      <xi:include href="user-system-options.xml" xpointer="machine" />

      <xi:include href="standard-options.xml" xpointer="help" />
      <xi:include href="standard-options.xml" xpointer="version" />
    </variablelist>

    <para>The following commands are understood:</para>

    <variablelist>
      <varlistentry>
        <term><command>status</command></term>

        <listitem><para>Show current system
        hostname and related
        information.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>set-hostname <replaceable>NAME</replaceable></command></term>

        <listitem><para>Set the system hostname to
        <replaceable>NAME</replaceable>. By default, this will alter
        the pretty, the static, and the transient hostname alike;
        however, if one or more of <option>--static</option>,
        <option>--transient</option>, <option>--pretty</option> are
        used, only the selected hostnames are changed. If the pretty
        hostname is being set, and static or transient are being set
        as well, the specified hostname will be simplified in regards
        to the character set used before the latter are updated. This
        is done by replacing spaces with <literal>-</literal> and
        removing special characters. This ensures that the pretty and
        the static hostname are always closely related while still
        following the validity rules of the specific name. This
        simplification of the hostname string is not done if only the
        transient and/or static host names are set, and the pretty
        host name is left untouched.</para>

        <para>Pass the empty string <literal></literal> as the
        hostname to reset the selected hostnames to their default
        (usually <literal>localhost</literal>).</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>set-icon-name <replaceable>NAME</replaceable></command></term>

        <listitem><para>Set the system icon name to
        <replaceable>NAME</replaceable>. The icon name is used by some
        graphical applications to visualize this host. The icon name
        should follow the <ulink
        url="http://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html">Icon
        Naming Specification</ulink>.</para>

        <para>Pass an empty string to reset the icon name to the
        default value, which is determined from chassis type (see
        below) and possibly other parameters.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><command>set-chassis <replaceable>TYPE</replaceable></command></term>

        <listitem><para>Set the chassis type to
        <replaceable>TYPE</replaceable>. The chassis type is used by
        some graphical applications to visualize the host or alter
        user interaction. Currently, the following chassis types are
        defined:
        <literal>desktop</literal>,
        <literal>laptop</literal>,
        <literal>server</literal>,
        <literal>tablet</literal>,
        <literal>handset</literal>,
        <literal>watch</literal>,
        <literal>embedded</literal>,
        as well as the special chassis types
        <literal>vm</literal> and
        <literal>container</literal> for virtualized systems that lack
        an immediate physical chassis.</para>

        <para>Pass an empty string to reset the chassis type to the
        default value which is determined from the firmware and
        possibly other parameters.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><command>set-deployment <replaceable>ENVIRONMENT</replaceable></command></term>

        <listitem><para>Set the deployment environment description.
        <replaceable>ENVIRONMENT</replaceable> must be a single word
        without any control characters. One of the following is
        suggested:
        <literal>development</literal>,
        <literal>integration</literal>,
        <literal>staging</literal>,
        <literal>production</literal>.
        </para>

        <para>Pass an empty string to reset to the default empty
        value.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><command>set-location <replaceable>LOCATION</replaceable></command></term>

        <listitem><para>Set the location string for the system, if it
        is known. <replaceable>LOCATION</replaceable> should be a
        human-friendly, free-form string describing the physical
        location of the system, if it is known and applicable. This
        may be as generic as <literal>Berlin, Germany</literal> or as
        specific as <literal>Left Rack, 2nd Shelf</literal>.</para>

        <para>Pass an empty string to reset to the default empty
        value.</para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>Exit status</title>

    <para>On success, 0 is returned, a non-zero failure code
    otherwise.</para>
  </refsect1>

  <refsect1>
    <title>See Also</title>
    <para>
      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>hostname</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>hostname</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>machine-info</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-hostnamed.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>
