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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">
+<!--
+  SPDX-License-Identifier: LGPL-2.1+
+
+  Copyright © 2014 Didier Roche
+-->
+<refentry id="systemd-machine-id-commit.service">
+
+  <refentryinfo>
+    <title>systemd-machine-id-commit.service</title>
+    <productname>systemd</productname>
+  </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>