Section: systemd-remount-fs.service (8)
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.
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