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82 lines
3.3 KiB
XML
82 lines
3.3 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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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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<!--
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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2016 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-volatile-root.service">
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<refentryinfo>
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<title>systemd-volatile-root.service</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-volatile-root.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-volatile-root.service</refname>
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<refname>systemd-volatile-root</refname>
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<refpurpose>Make the root file system volatile</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd-volatile-root.service</filename></para>
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<para><filename>/usr/lib/systemd/systemd-volatile-root</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-volatile-root.service</filename> is a service that replaces the root directory with a
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volatile memory file system (<literal>tmpfs</literal>), mounting the original (non-volatile)
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<filename>/usr</filename> inside it read-only. This way, vendor data from <filename>/usr</filename> is available as
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usual, but all configuration data in <filename>/etc</filename>, all state data in <filename>/var</filename> and all
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other resources stored directly under the root directory are reset on boot and lost at shutdown, enabling fully
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stateless systems.</para>
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<para>This service is only enabled if full volatile mode is selected, for example by specifying
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<literal>systemd.volatile=yes</literal> on the kernel command line. This service runs only in the initial RAM disk
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("initrd"), before the system transitions to the host's root directory. Note that this service is not used if
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<literal>systemd.volatile=state</literal> is used, as in that mode the root directory is non-volatile.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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