man/systemd-remount-fs.service.xml

   1 <?xml version="1.0"?>
   2 <!--*-nxml-*-->
   3 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   4   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   5 <!-- SPDX-License-Identifier: LGPL-2.1+ -->
   6 <refentry id="systemd-remount-fs.service">
   7
   8   <refentryinfo>
   9     <title>systemd-remount-fs.service</title>
  10     <productname>systemd</productname>
  11   </refentryinfo>
  12
  13   <refmeta>
  14     <refentrytitle>systemd-remount-fs.service</refentrytitle>
  15     <manvolnum>8</manvolnum>
  16   </refmeta>
  17
  18   <refnamediv>
  19     <refname>systemd-remount-fs.service</refname>
  20     <refname>systemd-remount-fs</refname>
  21     <refpurpose>Remount root and kernel file systems</refpurpose>
  22   </refnamediv>
  23
  24   <refsynopsisdiv>
  25     <para><filename>systemd-remount-fs.service</filename></para>
  26     <para><filename>/usr/lib/systemd/systemd-remount-fs</filename></para>
  27   </refsynopsisdiv>
  28
  29   <refsect1>
  30     <title>Description</title>
  31
  32     <para><filename>systemd-remount-fs.service</filename> is an early boot service that applies mount options
  33     listed in <citerefentry
  34     project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>, or
  35     gathered from the partition table (when
  36     <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  37     is active) to the root file system, the <filename>/usr</filename> file system, and the kernel API file
  38     systems. This is required so that the mount options of these file systems — which are pre-mounted by the
  39     kernel, the initial RAM disk, container environments or system manager code — are updated to those
  40     configured in <filename>/etc/fstab</filename> and the other sources. This service ignores normal file
  41     systems and only changes the root file system (i.e.  <filename>/</filename>), <filename>/usr</filename>,
  42     and the virtual kernel API file systems such as <filename>/proc</filename>, <filename>/sys</filename> or
  43     <filename>/dev</filename>. This service executes no operation if no configuration is found
  44     (<filename>/etc/fstab</filename> does not exist or lists no entries for the mentioned file systems, or
  45     the partition table does not contain relevant entries).</para>
  46
  47     <para>For a longer discussion of kernel API file systems see
  48     <ulink url="https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems">API
  49     File Systems</ulink>.</para>
  50
  51     <para>Note: <filename>systemd-remount-fs.service</filename> is usually pulled in by
  52     <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
  53     hence it is also affected by the kernel command line option <varname>fstab=</varname>, which may be used
  54     to disable the generator. It may also pulled in by
  55     <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
  56     which is affected by <varname>systemd.gpt_auto</varname> and other options.</para>
  57   </refsect1>
  58
  59   <refsect1>
  60     <title>See Also</title>
  61     <para>
  62       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  63       <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  64       <citerefentry project='man-pages'><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
  65       <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
  66       <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  67     </para>
  68   </refsect1>
  69
  70 </refentry>