How do you validate fstab without rebooting?
I modified /etc/fstab
.
I verified the new devices and I can mount them with the mount
command.
How may I validate the modifications made to /etc/fstab
?
Solution 1:
You can simple run: mount -a
-a Mount all filesystems (of the given types) mentioned in fstab.
This command will mount all (not-yet-mounted) filesystems mentioned in fstab and is used in system script startup during booting.
Solution 2:
The mount command take an --fake
or -f
for short. The following command should do what you need:
mount -fav
The following is in the documentation for -f
option:
Causes everything to be done except for the actual system call; if it's not obvious, this ``fakes'' mounting the filesystem. This option is useful in conjunction with the -v flag to determine what the mount command is trying to do.
(Note this is Linux - check before using elsewhere: FreeBSD uses -f
for 'force' - exactly the opposite meaning.)
Solution 3:
sudo findmnt --verify --verbose
is the best way I've found
Solution 4:
Note that if you add a swap file to your fstab, mount -a
won't turn it on: you'll want to run swapon -a
.
Solution 5:
I found this /problem/ but the solution didn't meet my requirements.
When rebooting with any invalid entries in the /etc/fstab, such as missing file systems that fsck cannot check; the system will fail to boot. That can be much more difficult to deal with if you have a headless box.
This is my solution to checking /etc/fstab to avoid this boot problem:
# cat /usr/local/bin/check-fstab-uuid-entries.sh
#!/usr/bin/env bash
for x in $(grep ^UUID /etc/fstab|cut -d \ -f 1|cut -d = -f 2)
do
if [ ! -h /dev/disk/by-uuid/$x ];then
echo $(grep $x /etc/fstab) ..... not found
fi
done