Hello everybody, after some investigation in the RabbitMQ problems we found some duplicated messages and timeouts in logs. Restarting the whole RabbitMQ cluster (stop all rabbitmq containers and start one by one) solved the problems for now. The main cause for this issue seams to by the nova notifications configuration with was deployed by kolla-ansible. If searchlight is not installed the 'notifications/notification_format' should be 'unversioned'. Default is 'both' so nova will send a notification to the queue versioned_notifications with has no consumer. In our case the queue got huge amount of messages with made the rabbitmq cluster more and more unstable, see: https://bugzilla.redhat.com/show_bug.cgi?id=1592528 Following settings in nova.conf may solve this issue but we didn`t tested this yet: [notification] notification_format = unversioned BR Pawel