May 2018
Intermediate to advanced
256 pages
7h 6m
English
Content preview from OpenStack for Architects - Second Edition
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Using the notification subsystem
Each of the OpenStack services can be configured to emit notifications on the message bus. These notifications can then be picked up by messaging clients or by the Ceilometer service. Notifications were originally implemented by each service separately, but the functionality has been folded into the Oslo Messaging library as a common interface.
To enable notification in Nova, the following settings need to be changed in /etc/nova/nova.conf:
| nova.conf Setting | Example value | Description |
| instance_usage_audit | true | Turns on usage auditing |
| instance_usage_audit_period | hour | Sets usage auditing to hourly |
| notify_on_state_change | vm_and_task_state | Tells Nova to send a notification when a VM's state changes |
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