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https://github.com/systemd/systemd
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This part of the copyright blurb stems from the GPL use recommendations: https://www.gnu.org/licenses/gpl-howto.en.html The concept appears to originate in times where version control was per file, instead of per tree, and was a way to glue the files together. Ultimately, we nowadays don't live in that world anymore, and this information is entirely useless anyway, as people are very welcome to copy these files into any projects they like, and they shouldn't have to change bits that are part of our copyright header for that. hence, let's just get rid of this old cruft, and shorten our codebase a bit.
67 lines
2.6 KiB
XML
67 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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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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