How to Change UUID in Linux

It essentials to use UUID to mount storage device if the system uses many disks which are very regularly switched or moved. UUID is integrated with the filesystem and it helps uniquely identify drives.

UUID’s normally changed when formatting or repartition a drive or any time when the filesystem affected for some reason.

This tutorial shows how to change UUID of a disk in Linux.

Change UUID in Linux

Based on the filesystem type we have few tools to change UUID. Linux utilities such as tune2fs (for ext2 or ext3 or ext3), xfs_admin (for xfs), btrfstune (for btrfs) can be used to change UUID.

In this example, I have used disk /dev/sdb to change the UUID and will use tune2fs command.

There are few ways to check the UUID of the storage device. Here we will use blkid command to find UUID.

First find UUID of the disk, type:

$ blkid /dev/sdb

Output:

/dev/sdb: UUID="f2cf4598-c725-4ef1-8ab6-e2cdc6028a33" TYPE="ext4"

To change the UUID of the filesystem, you need to unmount it.

Here the partition /dev/sdb is mounted at /mnt/data. To umount, type:

$ umount /mnt/data

Once the device is unmounted, use tune2fs command followed by -U flag to generate random UUID.

$ tune2fs -U random /dev/sdb

Output:

tune2fs 1.45.5 (07-Jan-2020)
Setting the UUID on this filesystem could take some time.
Proceed anyway (or wait 5 seconds to proceed) ? (y,N) y

Once the UUID is changed, run the following command to verify the changes.

$ blkid | grep sdb

output:

dev/sdb: UUID="af406bcd-cddb-4095-8456-fdf8dfe37665" TYPE="ext4"

After changing the existing UUID, make sure to update any references to the old labels in /etc/fstab file.

$ vi /etc/fstab

UUID="af406bcd-cddb-4095-8456-fdf8dfe37665"   /mnt/data  ext4 defaults  0 2 

Now mount the unmounted filesystem back.

$ mount /mnt/data

Conclusion

In this tutorial we learned how to change UUID in Linux using tune2fs command.

#Change #UUID #Linux

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