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<?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-remount-fs.service">
<refentryinfo>
<title>systemd-remount-fs.service</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-remount-fs.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-remount-fs.service</refname>
<refname>systemd-remount-fs</refname>
<refpurpose>Remount root and kernel file systems</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd-remount-fs.service</filename></para>
<para><filename>/usr/lib/systemd/systemd-remount-fs</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><filename>systemd-remount-fs.service</filename> is an early boot service that applies mount options
listed in <citerefentry
project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>, or
gathered from the partition table (when
<citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
is active) to the root file system, the <filename>/usr/</filename> file system, and the kernel API file
systems. This is required so that the mount options of these file systems — which are pre-mounted by the
kernel, the initrd, container environments or system manager code — are updated to those
configured in <filename>/etc/fstab</filename> and the other sources. This service ignores normal file
systems and only changes the root file system (i.e. <filename>/</filename>), <filename>/usr/</filename>,
and the virtual kernel API file systems such as <filename>/proc/</filename>, <filename>/sys/</filename> or
<filename>/dev/</filename>. This service executes no operation if no configuration is found
(<filename>/etc/fstab</filename> does not exist or lists no entries for the mentioned file systems, or
the partition table does not contain relevant entries).</para>
<para>For a longer discussion of kernel API file systems see
<ulink url="https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems">API
File Systems</ulink>.</para>
<para>Note: <filename>systemd-remount-fs.service</filename> is usually pulled in by
<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
hence it is also affected by the kernel command line option <varname>fstab=</varname>, which may be used
to disable the generator. It may also pulled in by
<citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
which is affected by <varname>systemd.gpt_auto</varname> and other options.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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