Install the Compute agent for Telemetry

Telemetry provides an API service that provides a collector and a range of disparate agents. This procedure details how to install the agent that runs on the compute node.

Install the Telemetry service on the Compute node:
```
# apt-get install ceilometer-agent-compute
```

Edit the /etc/nova/nova.conf file and add the following lines to the [DEFAULT] section:

[DEFAULT]
...
instance_usage_audit = True
instance_usage_audit_period = hour
notify_on_state_change = vm_and_task_state
notification_driver = nova.openstack.common.notifier.rpc_notifier
notification_driver = ceilometer.compute.nova_notifier

You must set the secret key that you defined previously. The Telemetry service nodes share this key as a shared secret:
Edit the /etc/ceilometer/ceilometer.conf file and change these lines in the [DEFAULT] section. Replace ADMIN_TOKEN with the admin token that you created previously:
```
...
[publisher_rpc]
# Secret value for signing metering messages (string value)
metering_secret = ADMIN_TOKEN
...
```
Configure the RabbitMQ access:
Edit the /etc/ceilometer/ceilometer.conf file and update the [DEFAULT] section:
```
[DEFAULT]
rabbit_host = controller
rabbit_password = RABBIT_PASS
```

Add the Identity service credentials:

Edit the /etc/ceilometer/ceilometer.conf file and change the [keystone_authtoken] section:

[keystone_authtoken]
auth_host = controller
auth_port = 35357
auth_protocol = http
admin_tenant_name = service
admin_user = ceilometer
admin_password = CEILOMETER_PASS

Also set the [service_credentials] section:

[service_credentials]
os_auth_url = http://controller:5000/v2.0
os_username = ceilometer
os_tenant_name = service
os_password = CEILOMETER_PASS

Configure the log directory.
Edit the /etc/ceilometer/ceilometer.conf file and update the [DEFAULT] section:
```
[DEFAULT]
log_dir = /var/log/ceilometer
```

Restart the service with its new settings:

# service ceilometer-agent-compute restart

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