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<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 initial RAM disk, 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>
