55 lines
2.4 KiB
XML
55 lines
2.4 KiB
XML
<?xml version="1.0"?>
|
|
<!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
<refentry id="systemd-volatile-root.service">
|
|
|
|
<refentryinfo>
|
|
<title>systemd-volatile-root.service</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>systemd-volatile-root.service</refentrytitle>
|
|
<manvolnum>8</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>systemd-volatile-root.service</refname>
|
|
<refname>systemd-volatile-root</refname>
|
|
<refpurpose>Make the root file system volatile</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para><filename>systemd-volatile-root.service</filename></para>
|
|
<para><filename>/usr/lib/systemd/systemd-volatile-root</filename></para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><filename>systemd-volatile-root.service</filename> is a service that replaces the root directory with a
|
|
volatile memory file system (<literal>tmpfs</literal>), mounting the original (non-volatile)
|
|
<filename>/usr/</filename> inside it read-only. This way, vendor data from <filename>/usr/</filename> is available as
|
|
usual, but all configuration data in <filename>/etc/</filename>, all state data in <filename>/var/</filename> and all
|
|
other resources stored directly under the root directory are reset on boot and lost at shutdown, enabling fully
|
|
stateless systems.</para>
|
|
|
|
<para>This service is only enabled if full volatile mode is selected, for example by specifying
|
|
<literal>systemd.volatile=yes</literal> on the kernel command line. This service runs only in the initial RAM disk
|
|
("initrd"), before the system transitions to the host's root directory. Note that this service is not used if
|
|
<literal>systemd.volatile=state</literal> is used, as in that mode the root directory is non-volatile.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|