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Home / OpenStack* on Intel® Architecture / Blogs / Cabuerger / 2015 / OpenStack* on Intel® Architecture - AODH: Alarm Events in OpenStack
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AODH: Alarm Events in OpenStack

Author: 
Christian Buerger
By Edwin Zhai, Lianhao Lu, and Malini Bhandaru

 

OpenStack Liberty now offers AODH, a Ceilometer sub-project that provides a more general alarm mechanism. 

 

The earlier OpenStack solution enabled the definition of alarms. In this case, the database was watched over a continuous period. Should a threshold be met, an alarm instance was generated. For example, the solution would watch for connection failure events. This solution brings a watch window latency, which might be intolerable for a 5 9s type Telco requirement. 

 

In comparison, AODH provides instant response times by specifying a separate event listener on the OpenStack message queue. This listener emits an alarm when a pre-defined event pattern occurs, an alarm which, in turn, enables immediate issue detection and possible response. In addition to the above, not only are programming interfaces improved, but all alarm related code is migrated to a separate sub-project with the alarms persisted to a database backend of your choice.

 

AODH: A Powerful New OpenStack Feature

To view an AODH demonstration video, click here [https://drive.google.com/a/intel.com/file/d/0BxzNz3_8jMMIa21NOUVGaXoyem8/view]. To install AODH, follow these guidelines:

 

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


 

 

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