Script to check if all fstab entries are mounted

In this article I'd like to share a script which would compare file system entries in the /etc/fstab file with the file systems that are currently mounted and tell us if there is any file system which has an entry in the /etc/fstab file but is not mounted.

So, here is the script:

[root@still ~]# cat tab.bash
#!/bin/bash

FSTAB_ENTRIES=$(cat /etc/fstab | awk '$1 !~/#|^$|swap/ {print $2}')

for FS in ${FSTAB_ENTRIES}

do

df -hPT | grep -wq ${FS}

if [ $? -eq 0 ]
 then
  echo "The file system ${FS} has an entry in /etc/fstab file and is mounted"
 else
  echo "The file system ${FS} has an entry in /etc/fstab file but is not mounted"
fi

done
[root@still ~]#

Let's test it out.

This is my /etc/fstab file and the current df output.

[root@still ~]# cat /etc/fstab ; df -hTP

#

# /etc/fstab

# Created by anaconda on Sat Dec 24 12:03:40 2016

#

# Accessible filesystems, by reference, are maintained under '/dev/disk'

# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info

#

/dev/mapper/centos-root /                       xfs     defaults        1 1

UUID=93b957e6-f8f9-42f9-a7ad-9927f694f1ce /boot                   xfs     defaults        1 2

/dev/mapper/centos-swap swap                    swap    defaults        0 0

##testing##

/dev/vg1/lv01   /test_dir1                       ext4     defaults        1 1

/dev/vg1/lv02   /test_dir2                       ext4     defaults        1 1

/dev/vg1/lv03   /test_dir3                       ext4     defaults        1 1

/dev/vg1/lv04   /test_dir4                       ext4     defaults        1 1

Filesystem              Type      Size  Used Avail Use% Mounted on

/dev/mapper/centos-root xfs        18G  6.0G   12G  35% /

devtmpfs                devtmpfs  481M     0  481M   0% /dev

tmpfs                   tmpfs     490M   80K  490M   1% /dev/shm

tmpfs                   tmpfs     490M  7.1M  483M   2% /run

tmpfs                   tmpfs     490M     0  490M   0% /sys/fs/cgroup

/dev/sda1               xfs       497M  134M  363M  27% /boot

/dev/mapper/vg1-lv01    ext4      283M  2.1M  262M   1% /test_dir1

/dev/mapper/vg1-lv02    ext4      283M  2.1M  262M   1% /test_dir2

You can notice that /test_dir3 and /test_dir4 file systems have entries in the /etc/fstab file but are not mounted at the moment.

Let's run the script to verify.

[root@still ~]# ./tab.bash

The file system / has an entry in /etc/fstab file and is mounted

The file system /boot has an entry in /etc/fstab file and is mounted

The file system /test_dir1 has an entry in /etc/fstab file and is mounted

The file system /test_dir2 has an entry in /etc/fstab file and is mounted

The file system /test_dir3 has an entry in /etc/fstab file but is not mounted

The file system /test_dir4 has an entry in /etc/fstab file but is not mounted

There you have it.

I hope this script helps you in being used as a pre-check or post-check during maintenance activities.