SYSTEMD-REMOUNT-FS.SERVICE(8)

  .SH "NAME" systemd-remount-fs.service, systemd-remount-fs - Remount root and kernel file systems
  .SH "SYNOPSIS"
    .PP systemd-remount-fs.service
    .PP /usr/lib/systemd/systemd-remount-fs

  .SH "DESCRIPTION"

    .PP systemd-remount-fs.service is an early boot service that applies mount options listed in fstab(5) to the root file system, the /usr 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 /etc/fstab. This service ignores normal file systems and only changes the root file system (i.e. /), /usr and the virtual kernel API file systems such as /proc, /sys or /dev. This service executes no operation if /etc/fstab does not exist or lists no entries for the mentioned file systems.
    .PP For a longer discussion of kernel API file systems see API File Systems[1].

  .SH "SEE ALSO"

    .PP systemd(1), fstab(5), mount(8)

NOTES

1.  API File Systems
    https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems