Implement Ceilometer

This patch implements the implement-ceilometer blueprint.
It addes the necessary role/variables to deploy ceilometer
with a Mongodb backend. The Monogdb backend is assumed to
be up and configured and the playbooks only require a few
values to be set in user_variables to establish a connection.

Change-Id: I2164a1f27f632ce254cc2711ada2c449a9961fed
Implements: blueprint implement-ceilometer

defaults/main.yml

@@ -16,6 +16,9 @@
 # Defines that the role will be deployed on a host machine
 is_metal: true
 
+# Enable/Disable ceilometer configurations
+nova_ceilometer_enabled: False
+
 ## Verbosity Options
 debug: False
 verbose: True

templates/nova.conf.j2

@@ -100,6 +100,14 @@ max_age = {{ nova_max_age }}
 # Common
 memcached_servers = {{ memcached_servers }}
 
+# Ceilometer notification configurations
+{% if nova_ceilometer_enabled %}
+instance_usage_audit = True
+instance_usage_audit_period = hour
+notify_on_state_change = vm_and_task_state
+notification_driver = messagingv2
+{% endif %}
+
 # Cinder
 [cinder]
 catalog_info = volume:cinder:internalURL