systemd-remount-fs.service

systemd
systemd-remount-fs.service 8
systemd-remount-fs.service systemd-remount-fs Remount root and kernel file systems

`systemd-remount-fs.service`

`/usr/lib/systemd/systemd-remount-fs`

## Description

`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.

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.

## See Also

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