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-<?xml version="1.0"?>
-<!--*-nxml-*-->
-<!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 2014 Didier Roche
-
- 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-commit.service">
-
- <refentryinfo>
- <title>systemd-machine-id-commit.service</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Didier</firstname>
- <surname>Roche</surname>
- <email>didrocks@ubuntu.com</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>systemd-machine-id-commit.service</refentrytitle>
- <manvolnum>8</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>systemd-machine-id-commit.service</refname>
- <refpurpose>Commit a transient machine ID to disk</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <para><filename>systemd-machine-id-commit.service</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><filename>systemd-machine-id-commit.service</filename> is an
- early boot service responsible for committing transient
- <filename>/etc/machine-id</filename> files to a writable disk file
- system. See
- <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for more information about machine IDs.</para>
-
- <para>This service is started after
- <filename>local-fs.target</filename> in case
- <filename>/etc/machine-id</filename> is a mount point of its own
- (usually from a memory file system such as
- <literal>tmpfs</literal>) and /etc is writable. The service will
- invoke <command>systemd-machine-id-setup --commit</command>, which
- writes the current transient machine ID to disk and unmount the
- <filename>/etc/machine-id</filename> file in a race-free manner to
- ensure that file is always valid and accessible for other
- processes. See
- <citerefentry><refentrytitle>systemd-machine-id-setup</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- for details.</para>
-
- <para>The main use case of this service are systems where
- <filename>/etc/machine-id</filename> is read-only and initially
- not initialized. In this case, the system manager will generate a
- transient machine ID file on a memory file system, and mount it
- over <filename>/etc/machine-id</filename>, during the early boot
- phase. This service is then invoked in a later boot phase, as soon
- as <filename>/etc</filename> has been remounted writable and the
- ID may thus be committed to disk to make it permanent.</para>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd-machine-id-setup</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>