[openstack-dev] [oslo_messaging]Notification listener for nova

Sandy Walsh sandy.walsh at RACKSPACE.COM
Wed Mar 4 12:31:15 UTC 2015

I assume you have notifications enabled in nova.conf?

See the "Enabling notifications in OpenStack" section http://www.stacktach.com/about.html

Oh, there are couple more flags that could be useful too:



From: Eduard Matei <eduard.matei at cloudfounders.com>
Sent: Wednesday, March 4, 2015 3:14 AM
To: OpenStack Development Mailing List (not for usage questions)
Subject: [openstack-dev] [oslo_messaging]Notification listener for nova

I'm trying to listen to events of type "compute.instance.*" (e.g. compute.instance.update).
I tried the following code:

from oslo_config import cfg
import oslo_messaging

class NotificationEndpoint(object):
    filter_rule = oslo_messaging.NotificationFilter(publisher_id='compute.*',
                                                    context={'ctxt_key': 'regexp'})

    def info(self, ctxt, publisher_id, event_type, payload, metadata):

    def warn(self, ctxt, publisher_id, event_type, payload, metadata):

transport = oslo_messaging.get_transport(cfg.CONF)
targets = [oslo_messaging.Target(topic='notifications'),?
endpoints = [NotificationEndpoint()]
pool = "listener-workers"
server = oslo_messaging.get_notification_listener(transport=transport,

then, from Horizon i changed an instance name (which should call _send_instance_update_notification)  but i didn't get any notification.

Any ideas?


Eduard Biceri Matei, Senior Software Developer
 | eduard.matei at cloudfounders.com<mailto:eduard.matei at cloudfounders.com>

CloudFounders, The Private Cloud Software Company

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