AODH: ALARM EVENTS IN OPENSTACK

 AODH是从Ceilometer分离出来的一个子项目，开始于OpenStack Liberty，用来提供alarm机制。

除了之前Ceilometer有的基于sample的警报机制，AODH还添加了基于事件的警报机制，使得警报可以实时。 

SETUP

To configure devstack to use Aodh

Add the following to your local.conf or localrc file:

# Enable Aodh alarm service

enable_plugin aodh git://git.openstack.org/openstack/aodh

enable_service aodh-evaluator aodh-notifier aodh-api

disable_service Ceilometer-alarm-notifier Ceilometer-alarm-evaluator

To configure listening on the alarm topic

Check all event-alarms, filter events in the “alarm.all” topic, and configure the same to listen for alarm events. In addition, add the following line, post the original notifier, to your /etc/Ceilometer/event_pipeline.yaml:

 - notifier://?topic=alarm.all

- notifier://

Or add the following in the devstack local.conf or localrc:

CEILOMETER_EVENT_ALARM=True

This config is honored by devstack only when Ceilometer is configured as a plugin in the devstack local.conf

enable_plugin Ceilometer git://git.openstack.org/openstack/Ceilometer

To install AODH-supported Ceilometer client

First, you must ensure you are using a Python-Ceilometer client that is at least version 1.5.0. To check the version, do the following:

$ pip show Python-Ceilometerclient

---

Metadata-Version: 2.0

Name: Python-Ceilometerclient

Version: 1.5.0

Summary: OpenStack Telemetry API Client Library

To update it:

$ pip uninstall Python-Ceilometerclient

$ pip install Python-Ceilometerclient

ALARM EVENT DEFINITION

To generate an alarm event when an image is updated assume the image resource id is 9a8fec25-1ba6-4170-aa44-5d72f17c07f6 and we are interested in updates to the same.

$ Ceilometer -d alarm-event-create --name event_alarm1 --alarm-action 'log://' --event-type image.update  -q 'traits.resource_id=string::9a8fec25-1ba6-4170-aa44-5d72f17c07f6'

Then, use following to trigger an “image.update” event:

nova image-meta cirros-0.3.4-x86_64-uec-ramdisk set progress=104

Watch the devstack screen window: aodh-notifier to capture the firing of the event alarm.

For more information, please see the following

1.     Blueprint: https://blueprints.launchpad.net/Ceilometer/+spec/event-alarm-evaluator

2.     Spec: http://specs.openstack.org/openstack/Ceilometer-specs/specs/liberty/event-alarm-evaluator.html

3.     Docs: http://docs.openstack.org/developer/aodh/index.html

4.     Demo: https://drive.google.com/a/intel.com/file/d/0BxzNz3_8jMMIa21NOUVGaXoyem8/view

5.     Open issues: https://review.openstack.org/#/q/status:open+project:openstack/aodh,n,z

6.     AODH name: http://www.behindthename.com/name/aodh