SYS: Configure systems to mount file systems at boot by Universally Unique ID (UUID) or label.

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Note: This is an RHCSA 7 exam objective.

Mount with UUID

UUID stands for Universal Unique ID. It is 128-bit value that uniquely identifies a disk or partition of a disk.

To get the list of disk UUID, type:

# blkid

To define the disk or partition that you want to mount (here lv_vol) and append it to the /etc/fstab file, type:

# blkid | grep lv_vol >> /etc/fstab

Then, edit the /etc/fstab file and change the new added line with the correct parameters (here /mnt as mount point, ext4 as file system type, etc).

UUID=".." /mnt ext4 defaults 1 2

To mount the disk or partition, type:

# mount /mnt

Mount with label

In addition to UUID, a disk or a partition of a disk can receive a label. It is a string of at most 16 characters long in the case of ext2/ext3/ext4.

To assign a label to a disk or partition (here /dev/vdb1), type:

# e2label /dev/vdb1 TEST
or
# tune2fs -L TEST /dev/vdb1

To get the label associated with a disk or a partition (here /dev/vdb1), type:

# e2label /dev/vdb1
TEST

To mount an ext4 formatted partition (here /dev/vdb1), edit the /etc/fstab file and paste the following line:

LABEL=TEST /mnt ext4 defaults 1 2

To mount the disk or partition, type:

# mount /mnt
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10 Comments on "SYS: Configure systems to mount file systems at boot by Universally Unique ID (UUID) or label."

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algorisms
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algorisms

One thing I have noticed from your guides here is that you do not list how to add labels to an already existing ext4 FS – It might be useful for students to know that the following tools can add/change labels on filesystems.

e2label – EX: e2label /dev/sda1 STORAGE

tune2fs – EX: tune2fs -L STORAGE /dev/sda1

Very handy if you are already existing filesystem and expected to change its name.

linuxfan
Member
linuxfan

I would add this to your blkid command 🙂

blkid | grep lv_vol | awk ‘{print$2}’ >> /etc/fstab

navideh
Member
navideh

In exam they will give us empty hard drive which we can divide to create what questions want or we need to decrease other space to create lvm or swap space?

thegeekaid
Member
thegeekaid

Same question here

Lisenet
Member

You have to be prepared for both.

wpDiscuz

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