List of labels
You can view the list of existing labels in the following path:
/dev/disk/by-label/
If this directory does not exist, then there are no labels in the system
Adding a label
For different file systems, the label is added differently.
ext2/ext3/ext4:
e2label /dev/sda1 LABEL
reiserfs:
reiserfstune -l LABEL /dev/sda1
jfs:
jfs_tune -L LABEL /dev/sda1
xfs:
xfs_admin -L LABEL /dev/sda1
Where, "LABEL" – a unique label, "/dev/sda1" – necessary partition
fstab
An example of recording in fstab to mount an xfs section on the "SITE" label
LABEL=SITE /var/www/html/site xfs defaults 0 0