Difference between revisions of "Universally unique identifier (UUID)"

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TODO
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[[wikipedia:Universally_unique_identifier|Universally unique identifier (UUID)]]
  
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* [[Filesystem]] UUID
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* Block device UUID: <code>[[lsblk]] -io KNAME,TYPE,SIZE,MODEL,UUID</code>
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* [[LVM]] [[PV]] UUID: <code>[[pvdisplay]]</code>
  
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* <code>[[blkid -s]] [[UUID]] -o value /dev/vdb1655</code>
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* uuid=`findmnt /mnt/your_path -o UUID -n`
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== EXT4 filesystem ==
 
<pre>
 
<pre>
 
mkfs.ext4 /dev/vg01/lv01
 
mkfs.ext4 /dev/vg01/lv01
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Creating journal (262144 blocks): done
 
Creating journal (262144 blocks): done
 
Writing superblocks and filesystem accounting information: done
 
Writing superblocks and filesystem accounting information: done
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</pre>
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== LVM ==
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<code>[[pvdisplay]]</code>
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  --- Physical volume ---
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  PV Name              /dev/sdc3
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  VG Name              rhvh
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  PV Size              <7.28 TiB / not usable 3.00 MiB
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  Allocatable          yes
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  PE Size              4.00 MiB
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  Total PE              1907390
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  Free PE              25600
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  Allocated PE          1881790
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  PV [[UUID]]              Tk3lEU-NzHl-miXe-bKNk-wcNN-vvou-nM0IGD
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<pre>
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pvcreate --uuid "FmGRh3-zhok-iVI8-7qTD-S5BI-MAEN-NYM5Sk" --restorefile /etc/lvm/archive/VG_00050.vg /dev/sdh1
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  Physical volume "/dev/sdh1" successfully created
 
</pre>
 
</pre>
  
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<code>[[pvchange]] --[[uuid]]</code> Generate new random UUID for specified PVs.
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== Related terms ==
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* https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-04#name-uuid-version-7
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* <code>[[/etc/fstab]]</code>
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* <code>[[uuid]]</code> [[node.js]] [[module]]
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* <code>[[uuidgen]]</code>
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* [[Kubernetes UID]]
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* [[Elasticsearch index]]: <code>[[curl -k "https://localhost:9200/_cat/indices?v&health=red]]" -u'XXX:UUU'</code>
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* [[ULID]]
  
 
== See also ==
 
== See also ==
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* [[Filesystem]]
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* {{mount}}
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* [[PV]]
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* {{Filesystems}}
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* {{fs}}
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* <code>[[libuuid]]</code> provided by <code>[[util-linux]]</code> package
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* {{multipath}}
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* [[PTUUID]] and [[PARTUUID]]
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* {{UUID}}
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[[Category:Linux]]

Latest revision as of 12:09, 14 May 2023

Universally unique identifier (UUID)

  • uuid=`findmnt /mnt/your_path -o UUID -n`

EXT4 filesystem[edit]

mkfs.ext4 /dev/vg01/lv01
mke2fs 1.44.1 (24-Mar-2018)
Creating filesystem with 2441850880 4k blocks and 305233920 inodes
Filesystem UUID: e6742357-a181-4b82-837f-9a01f3e52568
Superblock backups stored on blocks:
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
	4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
	102400000, 214990848, 512000000, 550731776, 644972544, 1934917632

Allocating group tables: done
Writing inode tables: done
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done

LVM[edit]

pvdisplay 

 --- Physical volume ---
 PV Name               /dev/sdc3
 VG Name               rhvh
 PV Size               <7.28 TiB / not usable 3.00 MiB
 Allocatable           yes
 PE Size               4.00 MiB
 Total PE              1907390
 Free PE               25600
 Allocated PE          1881790
 PV UUID               Tk3lEU-NzHl-miXe-bKNk-wcNN-vvou-nM0IGD

pvcreate --uuid "FmGRh3-zhok-iVI8-7qTD-S5BI-MAEN-NYM5Sk" --restorefile /etc/lvm/archive/VG_00050.vg /dev/sdh1
  Physical volume "/dev/sdh1" successfully created


pvchange --uuid Generate new random UUID for specified PVs.

Related terms[edit]

See also[edit]

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