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Diffstat (limited to 'man/systemd-machine-id-commit.service.xml')
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1 files changed, 101 insertions, 0 deletions
diff --git a/man/systemd-machine-id-commit.service.xml b/man/systemd-machine-id-commit.service.xml new file mode 100644 index 0000000000..6da19b9f17 --- /dev/null +++ b/man/systemd-machine-id-commit.service.xml @@ -0,0 +1,101 @@ +<?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 transient machine-id to disk</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <para><filename>systemd-machine-id-commit.service</filename></para> + <para><filename>/usr/lib/systemd/systemd-machine-id-commit</filename></para> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><filename>systemd-machine-id-commit.service</filename> is + a service responsible for commiting any transient + <filename>/etc/machine-id</filename> file to a writable file + system. See + <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry> + for more information about this file.</para> + + <para>This service is started shortly after + <filename>local-fs.target</filename> if + <filename>/etc/machine-id</filename> is an independent mount + point (probably a tmpfs one) and /etc is writable. + <command>systemd-machine-id-commit</command> will then + write current machine ID to disk and unmount the transient + <filename>/etc/machine-id</filename> file in a race-free + manner to ensure that file is always valid for other + processes.</para> + + <para>Note that the traditional way to initialize the machine + ID in <filename>/etc/machine-id</filename> is to use + <command>systemd-machine-id-setup</command> by system + installer tools. You can also use + <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry> + to initialize the machine ID on mounted (but not + booted) system images. The main use case for that service is + <filename>/etc/machine-id</filename> being an empty file at + boot and initrd chaining to systemd giving it a read only file + system that will be turned read-write later during the boot + process.</para> + + <para>There is no consequence if that service fails other than + a newer machine-id will be generated during next system boot. + </para> + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-machine-id-commit</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> |