Hi Russel,
Thanks for taking a look. I did the following:

1. Installed devstack on fedora
2. Stopped QPID. nov-network had an exception (below [1] - this is a separate issue and I would guess that one woud want to catch the exception and retry to connect)
3.  When QPID restarts nova-network manages to reconnect again (with an exception and then terminates).

The example that I had with the nova-network was with packages and not devstack. Any idea why this may be different behaviour?

I will take a look at devstack with Quantum service and post my findings.

Thanks
Gary

[1] Trace of crach for nova-network when qpid terminates

2012-11-03 18:54:41 INFO nova.openstack.common.rpc.impl_qpid [-] Connected to AMQP server on localhost:5672
2012-11-03 18:54:41 DEBUG nova.service [-] Creating Consumer connection for Service network from (pid=7002) start /opt/stack/nova/nova/service.py:404
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/eventlet/hubs/poll.py", line 97, in wait
    readers.get(fileno, noop).cb(fileno)
  File "/usr/lib/python2.7/site-packages/eventlet/green/select.py", line 48, in on_read
    current.switch(([original], [], []))
  File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 192, in main
    result = function(*args, **kwargs)
  File "/opt/stack/nova/nova/service.py", line 123, in run_server
    server.start()
  File "/opt/stack/nova/nova/service.py", line 412, in start
    self.conn.create_consumer(node_topic, rpc_dispatcher, fanout=False)
  File "/opt/stack/nova/nova/openstack/common/rpc/amqp.py", line 136, in create_consumer
    self.connection.create_consumer(topic, proxy, fanout)
  File "/opt/stack/nova/nova/openstack/common/rpc/impl_qpid.py", line 526, in create_consumer
    consumer = TopicConsumer(self.conf, self.session, topic, proxy_cb)
  File "/opt/stack/nova/nova/openstack/common/rpc/impl_qpid.py", line 187, in __init__
    {}, name or topic, {})
  File "/opt/stack/nova/nova/openstack/common/rpc/impl_qpid.py", line 130, in __init__
    self.reconnect(session)
  File "/opt/stack/nova/nova/openstack/common/rpc/impl_qpid.py", line 135, in reconnect
    self.receiver = session.receiver(self.address)
  File "<string>", line 6, in receiver
  File "/usr/lib/python2.7/site-packages/qpid/messaging/endpoints.py", line 619, in receiver
    raise e
MalformedAddress: unrecognized characters line:1,18: openstack/network.(none) ; {"node": {"x-declare": {"auto-delete": true, "durable": true}, "type": "topic"}, "create": "always", "link": {"x-declare": {"auto-delete": true, "exclusive": false, "durable": false}, "durable": true, "name": "network.(none)"}}
Removing descriptor: 9
2012-11-03 18:54:41 CRITICAL nova [-] unrecognized characters line:1,18: openstack/network.(none) ; {"node": {"x-declare": {"auto-delete": true, "durable": true}, "type": "topic"}, "create": "always", "link": {"x-declare": {"auto-delete": true, "exclusive": false, "durable": false}, "durable": true, "name": "network.(none)"}}
2012-11-03 18:54:41 TRACE nova Traceback (most recent call last):
2012-11-03 18:54:41 TRACE nova   File "/opt/stack/nova/bin/nova-network", line 50, in <module>
2012-11-03 18:54:41 TRACE nova     service.wait()
2012-11-03 18:54:41 TRACE nova   File "/opt/stack/nova/nova/service.py", line 655, in wait
2012-11-03 18:54:41 TRACE nova     _launcher.wait()
2012-11-03 18:54:41 TRACE nova   File "/opt/stack/nova/nova/service.py", line 183, in wait
2012-11-03 18:54:41 TRACE nova     super(ServiceLauncher, self).wait()
2012-11-03 18:54:41 TRACE nova   File "/opt/stack/nova/nova/service.py", line 153, in wait
2012-11-03 18:54:41 TRACE nova     service.wait()
2012-11-03 18:54:41 TRACE nova   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 166, in wait
2012-11-03 18:54:41 TRACE nova     return self._exit_event.wait()
2012-11-03 18:54:41 TRACE nova   File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 116, in wait
2012-11-03 18:54:41 TRACE nova     return hubs.get_hub().switch()
2012-11-03 18:54:41 TRACE nova   File "/usr/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 177, in switch
2012-11-03 18:54:41 TRACE nova     return self.greenlet.switch()
2012-11-03 18:54:41 TRACE nova   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 192, in main
2012-11-03 18:54:41 TRACE nova     result = function(*args, **kwargs)
2012-11-03 18:54:41 TRACE nova   File "/opt/stack/nova/nova/service.py", line 123, in run_server
2012-11-03 18:54:41 TRACE nova     server.start()
2012-11-03 18:54:41 TRACE nova   File "/opt/stack/nova/nova/service.py", line 412, in start
2012-11-03 18:54:41 TRACE nova     self.conn.create_consumer(node_topic, rpc_dispatcher, fanout=False)
2012-11-03 18:54:41 TRACE nova   File "/opt/stack/nova/nova/openstack/common/rpc/amqp.py", line 136, in create_consumer
2012-11-03 18:54:41 TRACE nova     self.connection.create_consumer(topic, proxy, fanout)
2012-11-03 18:54:41 TRACE nova   File "/opt/stack/nova/nova/openstack/common/rpc/impl_qpid.py", line 526, in create_consumer
2012-11-03 18:54:41 TRACE nova     consumer = TopicConsumer(self.conf, self.session, topic, proxy_cb)
2012-11-03 18:54:41 TRACE nova   File "/opt/stack/nova/nova/openstack/common/rpc/impl_qpid.py", line 187, in __init__
2012-11-03 18:54:41 TRACE nova     {}, name or topic, {})
2012-11-03 18:54:41 TRACE nova   File "/opt/stack/nova/nova/openstack/common/rpc/impl_qpid.py", line 130, in __init__
2012-11-03 18:54:41 TRACE nova     self.reconnect(session)
2012-11-03 18:54:41 TRACE nova   File "/opt/stack/nova/nova/openstack/common/rpc/impl_qpid.py", line 135, in reconnect
2012-11-03 18:54:41 TRACE nova     self.receiver = session.receiver(self.address)
2012-11-03 18:54:41 TRACE nova   File "<string>", line 6, in receiver
2012-11-03 18:54:41 TRACE nova   File "/usr/lib/python2.7/site-packages/qpid/messaging/endpoints.py", line 619, in receiver
2012-11-03 18:54:41 TRACE nova     raise e
2012-11-03 18:54:41 TRACE nova MalformedAddress: unrecognized characters line:1,18: openstack/network.(none) ; {"node": {"x-declare": {"auto-delete": true, "durable": true}, "type": "topic"}, "create": "always", "link": {"x-declare": {"auto-delete": true, "exclusive": false, "durable": false}, "durable": true, "name": "network.(none)"}}
2012-11-03 18:54:41 TRACE nova 
[openstack@(none) nova]$