[openstack-dev] [Nova][libvirt] Understand why we lookup libvirt domains by instance name

Daniel P. Berrange berrange at redhat.com
Thu May 21 09:23:35 UTC 2015


On Wed, May 20, 2015 at 03:01:50PM -0700, Michael Still wrote:
> I note that we use instance.name to lookup the libvirt domain a bunch
> in the driver. I'm wondering why we don't just use instance.uuid all
> the time -- the code for that already exists. Is there a good reason
> to not move to always using the uuid?
> 
> I ask because instance.name is not guaranteed to be unique depending
> on how weird the nova deployment is.

Agreed, there's no benefit to using name - internally libvirt will always
prefer to use the UUID itself too.

These days though, there is only a single place in nova libvirt driver
that needs updating - the nova.virt.libvirt.host.Host class get_domain()
method just needs to be switched to use uuid.

Regards,
Daniel
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