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Hi Swami,

> On Aug 17, 2016, at 16:51, M Ranga Swami Reddy <swamireddy at gmail.com> wrote:
> 
> Thank you very much...
> I guess, change to zmq is a  configuration option (ie just change nova.conf, etc) and restart the service will work..Correct me if not.

That’s correct. Be aware that zmq uses redis for services discovery and proxies (if you use configuration with proxies which is default btw) and you need to specify this in nova.conf and have available redis and proxy (don’t forget to open ports in firewall). Needed changes to configuration file are described in the guide by [1] link.

> 
> Majority of notifications comes from compute/NOVA and will be consumed by Ceilometer. In this case, how nova message Q will syc with ceilometer?

In oslo messaging we have possibility to run separate transports for RPC and Notifications (simultaniously). So you can come up with zmq for RPC and rabbit or other transport which supports notifications.

> 
> Thanks
> Swami
> 
> 
> On Wed, Aug 10, 2016 at 5:34 PM, Oleksii Zamiatin <ozamiatin at mirantis.com <mailto:ozamiatin at mirantis.com>> wrote:
> Hi,
> 
> The general answer is: yes! it is possible for all services except Ceilometer yet.
> 
> RPC use case is 100% covered, but Ceilometer uses Notifications which are partly supported
> in zmq backend because they need some persistence when consumer is not present etc.
> 
> For all the other services (Nova, neutron, glance, cinder) you can run zmq RPC backend.
> 
> For Ceilometer and Notifications there is a possibility to run another backend driver
> (some people are looking at kafka for example).
> 
> To try zmq as RPC backend it is easier to start with devstack, for this please follow instructions in the guide [1].
> 
> Feel free to ping me if you get some questions regarding further steps in zmq+Openstack
> 
> 1 - http://docs.openstack.org/developer/oslo.messaging/zmq_driver.html#devstack-support <http://docs.openstack.org/developer/oslo.messaging/zmq_driver.html#devstack-support>
> 
> 
> > On Aug 10, 2016, at 14:36, M Ranga Swami Reddy <swamireddy at gmail.com <mailto:swamireddy at gmail.com>> wrote:
> >
> > Hello,
> > I wanted to uset he zmq as message Q for all Openstack components
> > like, Nova, glance, cinder, Ceilmeter,etc (just replace the default
> > rabbitmq with zmq).
> >
> > Is it possible to do this?
> >
> > Please advise.
> >
> > Thanks
> > Swami
> >
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