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1 | <?xml version="1.0"?> |
2 | <!--*-nxml-*--> | |
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3 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
4 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | |
0307f791 | 5 | <!-- SPDX-License-Identifier: LGPL-2.1+ --> |
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6 | <refentry id="systemd-volatile-root.service"> |
7 | ||
8 | <refentryinfo> | |
9 | <title>systemd-volatile-root.service</title> | |
10 | <productname>systemd</productname> | |
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11 | </refentryinfo> |
12 | ||
13 | <refmeta> | |
14 | <refentrytitle>systemd-volatile-root.service</refentrytitle> | |
15 | <manvolnum>8</manvolnum> | |
16 | </refmeta> | |
17 | ||
18 | <refnamediv> | |
19 | <refname>systemd-volatile-root.service</refname> | |
20 | <refname>systemd-volatile-root</refname> | |
21 | <refpurpose>Make the root file system volatile</refpurpose> | |
22 | </refnamediv> | |
23 | ||
24 | <refsynopsisdiv> | |
25 | <para><filename>systemd-volatile-root.service</filename></para> | |
26 | <para><filename>/usr/lib/systemd/systemd-volatile-root</filename></para> | |
27 | </refsynopsisdiv> | |
28 | ||
29 | <refsect1> | |
30 | <title>Description</title> | |
31 | ||
32 | <para><filename>systemd-volatile-root.service</filename> is a service that replaces the root directory with a | |
33 | volatile memory file system (<literal>tmpfs</literal>), mounting the original (non-volatile) | |
34 | <filename>/usr</filename> inside it read-only. This way, vendor data from <filename>/usr</filename> is available as | |
35 | usual, but all configuration data in <filename>/etc</filename>, all state data in <filename>/var</filename> and all | |
36 | other resources stored directly under the root directory are reset on boot and lost at shutdown, enabling fully | |
37 | stateless systems.</para> | |
38 | ||
39 | <para>This service is only enabled if full volatile mode is selected, for example by specifying | |
40 | <literal>systemd.volatile=yes</literal> on the kernel command line. This service runs only in the initial RAM disk | |
41 | ("initrd"), before the system transitions to the host's root directory. Note that this service is not used if | |
42 | <literal>systemd.volatile=state</literal> is used, as in that mode the root directory is non-volatile.</para> | |
43 | </refsect1> | |
44 | ||
45 | <refsect1> | |
46 | <title>See Also</title> | |
47 | <para> | |
48 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
49 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
50 | <citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry> | |
51 | </para> | |
52 | </refsect1> | |
53 | ||
54 | </refentry> |