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UUID

A Universally Unique Identifier (UUID) is an identifier standard used in software construction whose intent is to enable distributed systems to uniquely identify information without significant central coordination.

Typically, a UUID consists of 32 hexadecimal digits, displayed in 5 groups separated by hyphens, e.g.:

1c54e8c6-7847-48c8-90c3-af8060af197b

Getting UUIDs

To get a list of the UUIDs for your partitions:

  • open a terminal window
  • become root (type su and then enter your root password at the prompt)
  • use the command blkid
  • example of return:
# blkid 
/dev/sda2: UUID="15e1a70e-1d2a-47f5-a96a-a83d0c3fdc91" TYPE="ext4" /dev/sda1: UUID="d671e415-0aee-4e18-9b7a-bcc8a6e0f3d3" TYPE="ext4" /dev/sdb1: LABEL="swap" UUID="6d4cc0e2-fcd4-46aa-890b-7671103ce9ca" TYPE="swap"
/dev/sdb2: LABEL="data" UUID="8a0b19d0-3672-4c55-80da-645b08183f55" TYPE="ext4"
/dev/sdc1: LABEL="Backup" UUID="387DB7D1242D8864" TYPE="ntfs"

Using UUIDs

The primary reason for using UUIDs is to avoid problems with device locators changing (e.g., sdc1 might become sdc2 whe another device is plugged in). See this discussion for more.


v. 20150718

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