Configure notification on controller or nova host?

[stef4711]

My stacktach VM does not receive any events and I'm wondering if I configured the notification in nova.conf not correctly. I'm using a 3 node icehouse (controller, nova, cinder)

1. Do I have to configure nova.conf on the controller or nova host? Or both?
2. The nova.conf on the controller has the driver "notification_driver=messaging". Do I have to overwrite it with "notification_driver=nova.openstack.common.notifier.rpc_notifier"?
3. The nova.conf on the nova compute host has two drivers: notification_driver=nova.openstack.common.notifier.rpc_notifier,ceilometer.compute.nova_notifier
   Is this okay?

Any hint would be very helpful.

Thx, Stef