man/systemd-remount-fs.service.xml

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