man/systemd-remount-fs.service.xml

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