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Is there a chance to get rid of this vif-plugged event at all? E.g. by
transitioning it to an ReST API interface? As far as I know this is the
only RPC interface between neutron and nova. 


-- 
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Andreas 
IRC: andreas_s (formerly scheuran)



On Mo, 2016-06-06 at 20:25 +0900, Akihiro Motoki wrote:
> Hi,
> 
> If I understand correctly, what you need is to expose the neutron
> behavior through API or something. In this particular case, neutron
> need to send a vif-plugged event when neutron detects some event in
> the data plane (VIF plugging in OVS or some virtual switch). Thus I
> think the question can be generalized to whether we expose a
> capability (such that neutron server behaves in XXX way) through API
> (API version? extension?). For example, do we have an extension to
> expose that neutron supports the event callback mechanism?
> 
> I also think the important point is that it is a topic of
> deployment.Operators are responsible of deploying correct combination
> of nova and neutron.
> 
> Honestly I am not sure we need to expose this kind of things through
> API. Regarding the current event callback mechanism, we assume that
> operators deploy the expected combination of releases of nova and
> neutron. Can't we assume that operators deploy Newton nova and neutron
> when they want to use live-migration vif-plugging support?
> 
> Akihiro
> 
> 2016-06-06 17:06 GMT+09:00 Oleg Bondarev <obondarev at mirantis.com>:
> > Hi,
> >
> > There are cases where it would be useful to know the version of Neutron (or
> > any other project) from API, like during upgrades or in cross-project
> > communication cases.
> > For example in https://review.openstack.org/#/c/246910/ Nova needs to know
> > if Neutron sends vif-plugged event during live migration. To ensure this it
> > should be enough to know Neutron is "Newton" or higher.
> >
> > Not sure why it wasn't done before (or was it and I'm just blind?) so the
> > question to the community is what are possible issues/downsides of exposing
> > code version through the API?
> >
> > Thanks,
> > Oleg
> >
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