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

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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
        "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

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<refentry id="systemd-machine-id-setup">

        <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>

        </refsect1>

        <refsect1>
                <title>Options</title>

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

                <variablelist>
                        <varlistentry>
                                <term><option>-h</option></term>
                                <term><option>--help</option></term>

                                <listitem><para>Prints a short help
                                text and exits.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><option>--version</option></term>

                                <listitem><para>Prints a short version
                                string and exits.</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>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>dbus-uuidgen</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                </para>
        </refsect1>

</refentry>