Configuring the Aodh service (optional)

The Telemetry alarming services perform the following functions:

• Creates an API endpoint for controlling alarms.

• Allows you to set alarms based on threshold evaluation for a collection of samples.

Configuring the hosts

Configure Aodh by specifying the metering-alarm_hosts directive in the /etc/openstack_deploy/conf.d/aodh.yml file. The following shows the example included in the etc/openstack_deploy/conf.d/aodh.yml.example file:

# The infra nodes that the Aodh services run on.
metering-alarm_hosts:
  infra1:
    ip: 172.20.236.111
  infra2:
    ip: 172.20.236.112
  infra3:
    ip: 172.20.236.113

The metering-alarm_hosts provides several services:

• An API server (aodh-api): Runs on one or more central management servers to provide access to the alarm information in the data store.

• An alarm evaluator (aodh-evaluator): Runs on one or more central management servers to determine alarm fire due to the associated statistic trend crossing a threshold over a sliding time window.

• A notification listener (aodh-listener): Runs on a central management server and fire alarms based on defined rules against event captured by ceilometer’s module’s notification agents.

• An alarm notifier (aodh-notifier). Runs on one or more central management servers to allow the setting of alarms to base on the threshold evaluation for a collection of samples.

These services communicate by using the OpenStack messaging bus. Only the API server has access to the data store.

To install aodh on an existing OpenStack-Ansible environment, run the os-aodh-install.yml playbook.