[chef] Uniquely identify a node

[Julien Vehent < >]

Hi all,
I'm working on a cookbook that distributes keys to nodes. It keeps a history 
of the distributions, by identifying a node based on the fqdn.
This is not ideal, because if we recreate a node and reuse the fqdn, then my 
cookbook won't redistribute the key to it (until a timer expires after 
several hours). So I'm looking for a better way to uniquely identify a node.

I considered using UUIDs stored in node['filesystem'] but their locations 
are not deterministic (some nodes use LVM, others just have directly attached 
disks, ...).

Does Chef have a parameter that uniquely identifies a node ?

Thanks,
Julien