Enable ceilometer in devstack

Magnum is going to send metrics/notifications to ceilometer. The
metrics will be leveraged to trigger ceilometer alarms, which is
needed to achieve autoscaling bay.

Change-Id: Ib80c9ab699a72701cefc4dfeb7f2542cecd8f2c9
Partially-Implements: blueprint autoscale-bay
Partially-Implements: blueprint magnum-notifications

devstack/lib/magnum

@@ -175,6 +175,10 @@ function create_magnum_conf {
 
         iniset $MAGNUM_CONF DEFAULT enabled_ssl_apis "$MAGNUM_ENABLED_APIS"
     fi
+
+    if is_service_enabled ceilometer; then
+        iniset $MAGNUM_CONF DEFAULT notification_driver "messaging"
+    fi
 }
 
 function update_heat_policy {

devstack/settings

@@ -31,6 +31,15 @@ enable_service h-api
 enable_service h-api-cfn
 enable_service h-api-cw
 
+# Enable Ceilometer services
+enable_service ceilometer-acompute
+enable_service ceilometer-acentral
+enable_service ceilometer-anotification
+enable_service ceilometer-collector
+enable_service ceilometer-api
+enable_service ceilometer-alarm-notifier
+enable_service ceilometer-alarm-evaluator
+
 # Enable Magnum services
 enable_service m-api
 enable_service m-cond

doc/source/dev/dev-manual-devstack.rst

@@ -81,6 +81,18 @@ http://docs.openstack.org/developer/devstack/configuration.html
 More neutron configuration information can be found at
 http://docs.openstack.org/developer/devstack/guides/neutron.html
 
+Optionally, you can enable ceilometer in devstack. If ceilometer is enabled,
+magnum will periodically send metrics to ceilometer. If you need this feature,
+add the following lines to your `local.conf` file::
+
+    enable_service ceilometer-acompute
+    enable_service ceilometer-acentral
+    enable_service ceilometer-anotification
+    enable_service ceilometer-collector
+    enable_service ceilometer-api
+    enable_service ceilometer-alarm-notifier
+    enable_service ceilometer-alarm-evaluator
+
 Create a local.sh to automatically make necessary networking changes during
 the devstack deployment process. This will allow bays spawned by magnum to
 access the internet through PUBLIC_INTERFACE::
@@ -188,6 +200,10 @@ Configure magnum::
     sudo sed -i "s/#auth_uri\s*=.*/auth_uri=http:\/\/127.0.0.1:5000\/v2.0/" \
              /etc/magnum/magnum.conf
 
+    # set notification_driver (if using ceilometer)
+    sudo sed -i "s/#notification_driver\s*=.*/notification_driver=messaging/" \
+             /etc/magnum/magnum.conf
+
 Clone and install the magnum client::
 
     cd ~