[openstack-dev] [Nova] Hypervisor Version Support

John Garbutt john at johngarbutt.com
Wed Aug 7 14:54:07 UTC 2013

I guess this is the same issue we faced with the capabilities filters
and things, when drivers don't report stats in a consistent format.

If we dictate the driver reports things in a standard format, it will
make our lives much easier, I think.

Currently, some report their own format, and a few (not just libvirt)
use the libvirt format. It would seem better to report something more
standard like "a.b.c.d". But to be honest, I think consistency is the
key here.


On 7 August 2013 15:36, Russell Bryant <rbryant at redhat.com> wrote:
> On 08/07/2013 10:14 AM, Andrew Laski wrote:
>> On 08/07/13 at 07:38am, Kaushik Chandrashekar wrote:
>>> Hi All,
>>> We are working on adding hypervisors version support for xen,
>>> https://blueprints.launchpad.net/nova/+spec/xen-support-for-hypervisor-versions
>>> The initial design is,
>>>   1. The image would have a property with hypervisor version
>>> requirements,
>>>   in this format '>=6.0,<6.2'
>>>   2. The host state manager would have the hypervisor version loaded in
>>>   (6,0,1) format.
>>>   3. If the hypervisor versions are present in both of these, the
>>>   image_props_filter would filter hypervisors based on them.
>>> https://review.openstack.org/#/c/36073/15/nova/scheduler/filters/image_props_filter.py
>>> We want to generalise this versioning for all hypervisors. So we are
>>> thinking of having "a.b.c.d" or (a, b, c ,d) as the version type where a,
>>> b, c, d are numbers. Do you see any hypervisors that have a different
>>> versioning format?
>> Why do you want to generalize the versioning for all hypervisors?  I'm
>> not sure I see the benefit versus using the version as reported by the
>> hypervisor.  Especially since you're looking to compare against non
>> generalized versions based on your examples.
> I guess to ensure you can do comparison operations (<, >, etc)?
> --
> Russell Bryant
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