Adds support for Nova Memcached

Previously, the openstack::nova::controller class could only use
Nova's in-process cache for storing information such as
nova-consoleauth session tokens.

This patch adds a new parameter called memcached_servers that
allows Nova to use memcached instead of the in-process cache.

Defaults to false to continue having Nova use the in-process
cache for backwards compatibility.

Change-Id: Ic61962e6ebf588e5724d238954ec611b0bbcbd05

manifests/nova/controller.pp

@@ -6,6 +6,11 @@
 #
 # === Parameters
 #
+# [memcached_servers]
+#   Use memcached instead of in-process cache.
+#   Supply a list of memcached server IP's:Memcached Port.
+#   (optional) Defaults to false.
+#
 # [quantum]
 #   Specifies if nova should be configured to use quantum.
 #   (optional) Defaults to false (indicating nova-networks should be used)
@@ -61,6 +66,7 @@ class openstack::nova::controller (
   $nova_db_user              = 'nova',
   $nova_db_dbname            = 'nova',
   $enabled_apis              = 'ec2,osapi_compute,metadata',
+  $memcached_servers         = false,
   # Rabbit
   $rabbit_user               = 'openstack',
   $rabbit_virtual_host       = '/',
@@ -119,6 +125,7 @@ class openstack::nova::controller (
     rabbit_virtual_host  => $rabbit_virtual_host,
     image_service        => 'nova.image.glance.GlanceImageService',
     glance_api_servers   => $glance_connection,
+    memcached_servers    => $memcached_servers,
     debug                => $debug,
     verbose              => $verbose,
     rabbit_host          => $rabbit_connection,

spec/classes/openstack_nova_controller_spec.rb

@@ -2,7 +2,7 @@ require 'spec_helper'
 
 describe 'openstack::nova::controller' do
 
-  let :params do
+  let :default_params do
     {
       :public_address         => '127.0.0.1',
       :db_host                => '127.0.0.1',
@@ -11,6 +11,7 @@ describe 'openstack::nova::controller' do
       :quantum_user_password  => 'quantum_user_pass',
       :nova_db_password       => 'nova_db_pass',
       :quantum                => true,
+      :memcached_servers      => false,
       :metadata_shared_secret => 'secret'
     }
   end
@@ -19,6 +20,10 @@ describe 'openstack::nova::controller' do
     {:osfamily => 'Debian' }
   end
 
+  let :params do
+    default_params
+  end
+
   it { should contain_class('openstack::nova::controller') }
 
   context 'when configuring quantum' do
@@ -70,9 +75,19 @@ describe 'openstack::nova::controller' do
         :host    => '127.0.0.1',
         :enabled => true
       )
-
-
     end
   end
 
+  context 'when configuring memcached' do
+    let :params do
+      default_params.merge(
+        :memcached_servers => ['memcached01:11211', 'memcached02:11211']
+      )
+    end
+    it 'should configure nova with memcached' do
+      should contain_class('nova').with(
+        :memcached_servers => ['memcached01:11211', 'memcached02:11211']
+      )
+    end
+  end
 end