systemd/man/systemd-machine-id-setup.xml

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<refentry id="systemd-machine-id-setup"
    xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>systemd-machine-id-setup</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>systemd-machine-id-setup</refentrytitle>
    <manvolnum>1</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>systemd-machine-id-setup</refname>
    <refpurpose>Initialize the machine ID in /etc/machine-id</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>systemd-machine-id-setup</command>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><command>systemd-machine-id-setup</command> may be used by
    system installer tools to initialize the machine ID stored in
    <filename>/etc/machine-id</filename> at install time with a
    randomly generated ID. See
    <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>
    for more information about this file.</para>

    <para>This tool will execute no operation if
    <filename>/etc/machine-id</filename> is already
    initialized.</para>

    <para>If a valid D-Bus machine ID is already configured for the
    system, the D-Bus machine ID is copied and used to initialize the
    machine ID in <filename>/etc/machine-id</filename>.</para>

    <para>If run inside a KVM virtual machine and a UUID is passed via
    the <option>-uuid</option> option, this UUID is used to initialize
    the machine ID instead of a randomly generated one. The caller
    must ensure that the UUID passed is sufficiently unique and is
    different for every booted instanced of the VM.</para>

    <para>Similar, if run inside a Linux container environment and a
    UUID is set for the container this is used to initialize the
    machine ID. For details see the documentation of the <ulink
    url="http://www.freedesktop.org/wiki/Software/systemd/ContainerInterface">Container
    Interface</ulink>.</para>

    <para>Use
    <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
    to initialize the machine ID on mounted (but not booted) system
    images.</para>

  </refsect1>

  <refsect1>
    <title>Options</title>

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

    <variablelist>
      <varlistentry>
        <term><option>--root=<replaceable>root</replaceable></option></term>
        <listitem><para>Takes a directory path as an argument. All
        paths will be prefixed with the given alternate
        <replaceable>root</replaceable> path, including config search
        paths. </para></listitem>
      </varlistentry>
      <xi:include href="standard-options.xml" xpointer="help" />
      <xi:include href="standard-options.xml" xpointer="version" />
    </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>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
      <citerefentry project='dbus'><refentrytitle>dbus-uuidgen</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>