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authorLuke Shumaker <lukeshu@lukeshu.com>2017-05-20 17:35:06 -0400
committerLuke Shumaker <lukeshu@lukeshu.com>2017-05-20 17:35:06 -0400
commitf2f1f2472c5efc541bd53f51289ad58a86fa2d41 (patch)
tree42807ddc64ab0672744c716d9f952e5673762b9d /man/systemd-machine-id-setup.xml
parent3eed542bbc10978aa0b68a39dd3619edf7a7d90b (diff)
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-<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2012 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<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>
- <author>
- <contrib>Developer</contrib>
- <firstname>Didier</firstname>
- <surname>Roche</surname>
- <email>didrocks@ubuntu.com</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
- provisioned or randomly generated ID. See
- <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for more information about this file.</para>
-
- <para>If the tool is invoked without the <option>--commit</option>
- switch, <filename>/etc/machine-id</filename> is initialized with a
- valid, new machined ID if it is missing or empty. The new machine
- ID will be acquired in the following fashion:</para>
-
- <orderedlist>
- <listitem><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></listitem>
-
- <listitem><para>If run inside a KVM virtual machine and a UUID
- is configured (via the <option>-uuid</option>
- option), this UUID is used to initialize the machine ID. The
- caller must ensure that the UUID passed is sufficiently unique
- and is different for every booted instance of the
- VM.</para></listitem>
-
- <listitem><para>Similarly, if run inside a Linux container
- environment and a UUID is configured 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></listitem>
-
- <listitem><para>Otherwise, a new ID is randomly
- generated.</para></listitem>
- </orderedlist>
-
- <para>The <option>--commit</option> switch may be used to commit a
- transient machined ID to disk, making it persistent. For details,
- see below.</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 argument. All paths
- operated will be prefixed with the given alternate
- <replaceable>root</replaceable> path, including the path for
- <filename>/etc/machine-id</filename> itself.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--commit</option></term>
- <listitem><para>Commit a transient machine ID to disk. This
- command may be used to convert a transient machine ID into a
- persistent one. A transient machine ID file is one that was
- bind mounted from a memory file system (usually
- <literal>tmpfs</literal>) to
- <filename>/etc/machine-id</filename> during the early phase of
- the boot process. This may happen because
- <filename>/etc</filename> is initially read-only and was
- missing a valid machine ID file at that point.</para>
-
- <para>This command will execute no operation if
- <filename>/etc/machine-id</filename> is not mounted from a
- memory file system, or if <filename>/etc</filename> is
- read-only. The command will write the current transient
- machine ID to disk and unmount the
- <filename>/etc/machine-id</filename> mount point in a
- race-free manner to ensure that this file is always valid and
- accessible for other processes.</para>
-
- <para>This command is primarily used by the
- <citerefentry><refentrytitle>systemd-machine-id-commit.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- early boot service.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--print</option></term>
-
- <listitem><para>Print the machine ID generated or committed after the operation is complete.</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><refentrytitle>systemd-machine-id-commit.service</refentrytitle><manvolnum>8</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>