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Hi Vish,

Thanks, now one more question -

When I send the request out, I send it to the exchange 'nova' and routing key 'conductor' (using RabbitMQ), this will take the message to the Nova Conductor on the controller, I have been able to do that much.
I do see that there is a 'reply queue' embedded in the above message so presumably the Nova Conductor will use that queue to send back the response, is that correct ?
If the above is correct, what is the 'exchange' used Nova Conductor to send back this response.

Regards
-Prashant


From: Vishvananda Ishaya [mailto:vishvananda at gmail.com]
Sent: Wednesday, April 16, 2014 10:11 AM
To: OpenStack Development Mailing List (not for usage questions)
Cc: Prashant Upadhyaya
Subject: Re: [openstack-dev] [Openstack] Question regarding Nova in Havana

The service reference is created in the start method of the service. This happens around line 217 in nova/service.py in the current code. You should be able to do something similar by sending a message to service_create on conductor. It will return an error if the service already exists. Note you can also use service_get_by_args in conductor to see if the service exists.

Vish

On Apr 15, 2014, at 9:22 PM, Swapnil S Kulkarni <coolsvap at gmail.com<mailto:coolsvap at gmail.com>> wrote:


Interesting discussion. Forwarding to openstack-dev.

On Wed, Apr 16, 2014 at 9:34 AM, Prashant Upadhyaya <prashant.upadhyaya at aricent.com<mailto:prashant.upadhyaya at aricent.com>> wrote:
Hi,

I am writing a Compute Node Simulator.
The idea is that I would write a piece of software using C which honors the RabbitMQ interface towards the Controller, but will not actually do the real thing - everything on the Compute Node will be simulated by my simulator software.

The  problem I am facing, that I have not been able to get my simulated CN listed in the output of
nova-manage service list

I am on Havana, and my simulator is sending a periodic  'service_update' and 'compute_node_update' RPC messages to the 'nova' exchange and the 'conductor' routing key.
I can manipulate the above messages at will to fool the controller.
(I observe the messages from a real CN and take cues from there to construct a fake one from my simulator)

Question is - what causes the controller to add a new Nova Compute in its database, is it the 'service_update' RPC or something else.

Hopefully you can help me reverse engineer the interface.

Regards
-Prashant




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