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<?xml version="1.0"?>
<!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
SPDX-License-Identifier: LGPL-2.1+
This file is part of systemd.
Copyright 2012 Lennart Poettering
-->
<refentry id="systemd-remount-fs.service">
<refentryinfo>
<title>systemd-remount-fs.service</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Lennart</firstname>
<surname>Poettering</surname>
<email>lennart@poettering.net</email>
</author>
</authorgroup>
</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>
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 initial RAM disk, container environments or system
manager code — are updated to those listed in
<filename>/etc/fstab</filename>. 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 <filename>/etc/fstab</filename>
does not exist or lists no entries for the mentioned file
systems.</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>
</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>
</para>
</refsect1>
</refentry>
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