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
          m[blue]API File Systemsm[][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),

           1. API File Systems

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