host identifier

[Daniel P. Berrangé]

On Mon, Jul 05, 2021 at 08:31:15AM +0800, Jiatong Shen wrote:
> Hello community,
> 
> I am using OpenStack nova and realize that nova now uses host fqdn from
> libvirt as a uniq identifier for a compute node.  The issue is that host
> might need to change its fqdn under some
> rare circumstances and lose some usage data due to the nova manages
> compute node resources.
> 
> My question is: does libvirt already export host uuid identifier to other
> applications? I skim through the code base and find there is host uuid
> related code which reads /etc/machine-id to obtain a uniq uuid for
> migration, but seems this uuid cannot be obtained through virsh interface.

Libvirt has long exposed a host UUID in the capabilities XML

Regards,
Daniel
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