[dm-crypt] UUID question

Arno Wagner arno at wagner.name
Tue Dec 18 01:36:12 CET 2012


On Mon, Dec 17, 2012 at 04:10:50PM -0800, David Li wrote:
> Hi, I wonder if the dm-crypt partition UUID (shown in blkid -p <dev>) can
> be used to uniquely associate it with the set of keys the partition will
> need. Are there any cases that the UUID would change during the partition's
> lifetime?

The UUID is actually a filesystem attribute, not a partition 
attribute. That said, for purpose of an UUID, LUKS is regarded as a 
filesystem, which is IMO the correct way to view it, but not a 
perfect one. So, yes, the UUID will change if you do a luksFormat 
(aptly named if LUKS is regarded as a filesystem), but it will not 
change otherwise. As a luksFormat invalidates all keys, that should 
do for your purpose. 

Arno 
-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
----
One of the painful things about our time is that those who feel certainty
are stupid, and those with any imagination and understanding are filled
with doubt and indecision. -- Bertrand Russell


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