Mount disk uuid linux

Can I mount a drive using UUID from the command-line (Not fstab?)

Is it possible to use UUIDs to mount drives, rather than using these values in fstab? I have a script which mounts devices, however there is no way to guarantee that the drive labels such as /dev/sda2 will always be the same. I’m aware I can mount the drive at boot time using this method with fstab , however in the case of external disks, they may not always be present at boot time.

FYI having an entry in fstab does not mean you need the drive connected at boot time. mount will use the data in fstab when called.

3 Answers 3

Yes it’s possible, you just use the UUID option:

lsblk -o NAME,UUID NAME UUID sdc ├─sdc1 A190-92D5 └─sdc2 A198-A7BC sudo mount -U A198-A7BC /mnt 

sudo mount UUID=A198-A7BC /mnt 

sudo mount --uuid A198-A7BC /mnt 

Source: -L, --label synonym for LABEL= -U, --uuid synonym for UUID= LABEL= specifies device by filesystem label UUID= specifies device by filesystem UUID PARTLABEL= specifies device by partition label PARTUUID= specifies device by partition UUID specifies device by path mountpoint for bind mounts (see --bind/rbind) regular file for loopdev setup

If you’re interested in having an fstab entry for a drive which may not be present at boot time, you have two options which can help: noauto and nofail :

noauto : do not mount when «mount -a» is given (e.g., at boot time)

nofail : do not report errors for this device if it does not exist.

Imagine you have an fstab entry

UUID= /mnt/data ext4 defaults 

If you add noauto to the options, the system will not attempt to mount the drive at boot time. You’ll be able to mount it manually with mount /mnt/data .

If you add nofail , the system will try to mount the drive at boot time, but if the drive is not present the boot sequence will not be interrupted. You’ll be able to mount the drive if you plug it later using mount /mnt/data .

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Mounting Partitions Using UUID and LABEL on Linux

Here, /dev/sdb1 is set to mount at the path /storage/disk2p1. This is alright and it works. But there is a problem. /dev/sdb1 is the first partition of the second hard drive of your computer. Similarly, /dev/sda1 is the first partition of the first hard drive. There is no guarantee that /dev/sdb1 will always be /dev/sdb1. Depending on the order of how you connected the hard drives to your motherboard, it may change. If that happens, your hard drives may be mounted in the wrong mount points resulting data loss or data corruption.

To solve this, we can use UUID or LABEL. UUID is a better choice as it is unique throughout the system. Even if it’s different computer system, the probability of duplicate UUID is almost zero.

LABEL on the other hand is a short name that you can put it when you format a partition to identify the disk. Many people can use the same LABEL. So, the uniqueness of LABEL depends on how creative you are at naming your partitions.

In this article, I will show you how to mount partitions using UUID and LABEL using the /etc/fstab file on Linux. So, let’s get started.

Finding the UUID and LABEL of Partitions:

There are a couple of ways to find the UUID and LABEL of a partition. In this section, I will show you some of them.

You can find the UUID and LABEL of all the partitions from the command line as follows:

As you can see, the LABEL and UUID of all the partitions in your system is listed. There is one more parameter that you will need in order to mount a partition, the filesystem TYPE. For example, /dev/sdb1 in my case has the LABEL www, UUUID 7a75296d-412a-467c-a659-283298910746 and TYPE (filesystem type) ext4.

You can also find the UUID and LABEL of a partition from GNOME Disk Utility as you can see in the screenshot below.

Mounting Partitions Using UUID:

In this section, I am going to show you how to permanently mount partitions using UUIDs.

First, find the UUID of the partition that you want to mount using one of the methods stated above.

Let’s say, you want to mount the partition /dev/sdb1 using it’s UUID 7a75296d-412a-467c-a659-283298910746 to the path /var/www.

Then, make a new directory (in my case /var/www) where you want to mount the partition if it does not exist already with the following command:

Now, open the /etc/fstab configuration file with your favorite text editor. I am going to use nano.

Now, add the following line at the end of the file.

NOTE: Replace the 7a75296d-412a-467c-a659-283298910746 with the UUID of your partition, /var/www with the directory path where you want to mount the partition and ext4 with the filesystem type if yours is not of the type ext4.

Now, press + x followed by y and then press to save the changes you made to the /etc/fstab file.

$ sudo blkid /dev/sda1 -sUUID -ovalue

27847bad-139d-446d-af4e-d7d726b13f3c

UUID=af406bcd-cddb-4095-8456-fdf8dfe37665 /var/www ext4 defaults 0 0