Verify static filesystem information defined in the fstab file after applying modifications to ensure that system will boot without any problems. It is especially important in remote locations or places where you cannot easily perform emergency operations.
Display static filesystem information defined in fstab file.
$ cat /etc/fstab
# /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> # / was on /dev/vda1 during installation UUID=9d749b55-a024-4d89-b1c0-950bd38b98d8 / ext4 errors=remount-ro 0 1 # swap was on /dev/vda5 during installation UUID=33d7420a-1ab7-4872-8944-369c37354d1b none swap sw 0 0 /dev/sr0 /media/cdrom0 udf,iso9660 user,noauto 0 0
Verify /etc/fstab file contents.
$ sudo findmnt --verify
/media/cdrom0 [W] udf,iso9660 seems unsupported by the current kernel [W] cannot detect on-disk filesystem type 0 parse errors, 0 errors, 2 warnings
Verify /etc/fstab file contents and display verbose output.
$ sudo findmnt --verify --verbose
/ [ ] target exists [ ] FS options: errors=remount-ro [ ] UUID=9d749b55-a024-4d89-b1c0-950bd38b98d8 translated to /dev/vda1 [ ] source /dev/vda1 exists [ ] FS type is ext4 none [ ] UUID=33d7420a-1ab7-4872-8944-369c37354d1b translated to /dev/vda5 [ ] source /dev/vda5 exists [ ] FS type is swap /media/cdrom0 [ ] target exists [ ] userspace options: user,noauto [ ] source /dev/sr0 exists [W] udf,iso9660 seems unsupported by the current kernel [W] cannot detect on-disk filesystem type 0 parse errors, 0 errors, 2 warnings
Verify static ext4 filesystem type information defined in particular file (mounted file systems table).
$ sudo findmnt --verify --tab-file /etc/mtab --type ext4
/ [W] recommended root FS passno is 1 (current is 0) 0 parse errors, 0 errors, 1 warning
Sample static filesystem information file that deliberately contains multiple errors.
$ cat /etc/fstab
# /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> # / was on /dev/vda1 during installation UUID=9d749b55-a024-4d89-b1c0-950bd38b98d8 / ext3 errors=remount-ro UUID=9d749b55-a024-4d89-b1c0-950bd38b98d8 /opt xt4 errors=remount-ro 0 # swap was on /dev/vda5 during installation UUID=33d7420a-1ab7-4872-8944-369c37354d1b none swap sw 0 0 /dev/sr0 /media/cdrom0 udf,iso9660 user,noauto 0
Verify this inconsistent and erroneous file contents.
$ sudo findmnt --verify
/ [E] ext3 does not match with on-disk ext4 [W] recommended root FS passno is 1 (current is 0) /opt [W] xt4 seems unsupported by the current kernel [E] xt4 does not match with on-disk ext4 /media/cdrom0 [W] udf,iso9660 seems unsupported by the current kernel [W] cannot detect on-disk filesystem type 0 parse errors, 2 errors, 4 warnings
Exit code will indicate that there was an error.
$ echo $?
1
Display verbose output to investigate it further.
$ sudo findmnt --verify --tab-file /etc/fstab --verbose
/ [ ] target exists [ ] FS options: errors=remount-ro [ ] UUID=9d749b55-a024-4d89-b1c0-950bd38b98d8 translated to /dev/vda1 [ ] source /dev/vda1 exists [E] ext3 does not match with on-disk ext4 [W] recommended root FS passno is 1 (current is 0) /opt [ ] target exists [ ] FS options: errors=remount-ro [ ] UUID=9d749b55-a024-4d89-b1c0-950bd38b98d8 translated to /dev/vda1 [ ] source /dev/vda1 exists [W] xt4 seems unsupported by the current kernel [E] xt4 does not match with on-disk ext4 none [ ] UUID=33d7420a-1ab7-4872-8944-369c37354d1b translated to /dev/vda5 [ ] source /dev/vda5 exists [ ] FS type is swap /media/cdrom0 [ ] target exists [ ] userspace options: user,noauto [ ] source /dev/sr0 exists [W] udf,iso9660 seems unsupported by the current kernel [W] cannot detect on-disk filesystem type 0 parse errors, 2 errors, 4 warnings
