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