Provided by: systemd_245.4-4ubuntu3_amd64 bug


       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), or gathered from the partition table (when systemd-gpt-auto-generator(8) is
       active) 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 configured in /etc/fstab and the other sources. 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
       no configuration is found (/etc/fstab does not exist or lists no entries for the mentioned
       file systems, or the partition table does not contain relevant entries).

       For a longer discussion of kernel API file systems see API File Systems[1].

       Note: systemd-remount-fs.service is usually pulled in by systemd-fstab-generator(8), hence
       it is also affected by the kernel command line option fstab=, which may be used to disable
       the generator. It may also pulled in by systemd-gpt-auto-generator(8), which is affected
       by systemd.gpt_auto and other options.


       systemd(1), fstab(5), mount(8), systemd-fstab-generator(8), systemd-gpt-auto-generator(8)


        1. API File Systems