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
systemd 229 SYSTEMD-REMOUNT-FS.SERVICE(8)
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