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11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
69 lines
2.6 KiB
XML
69 lines
2.6 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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-->
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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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