systemd-remount-fs.service, systemd-remount-fs - Remount root and
   kernel file systems





   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.

   For a longer discussion of kernel API file systems see API File


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


    1. API File Systems


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