Properly use groups throught Ansible

Additionally, make each service optional witha config option allowing
for extreme flexibility should the deployer want to replace a service
with a non-kolla one (the database for example).

Change-Id: I7b644da7cfa7e8e6b6878eb1b1aa97db830504ae
Closes-Bug: #1478509

ansible/roles/glance/tasks/start.yml

@@ -7,6 +7,7 @@
     container_name: "glance_registry"
     container_volumes:
       - "{{ node_config_directory }}/glance-registry/:/opt/kolla/glance-registry/:ro"
+  when: inventory_hostname in groups['glance-registry']
 
 - include: ../../start.yml
   vars:
@@ -16,3 +17,4 @@
     container_name: "glance_api"
     container_volumes:
       - "{{ node_config_directory }}/glance-api/:/opt/kolla/glance-api/:ro"
+  when: inventory_hostname in groups['glance-api']

ansible/site.yml

@@ -1,39 +1,28 @@
 ---
 - hosts: haproxy
   roles:
-    - haproxy
-  tags: haproxy
+    - { role: haproxy, tags: haproxy, keepalived when: enable_haproxy | bool }
 
 - hosts: mariadb
   roles:
-    - mariadb
-  tags: mariadb
+    - { role: mariadb, tags: mariadb, when: enable_mariadb | bool }
 
 - hosts: rabbitmq
   roles:
-    - rabbitmq
-  tags: rabbitmq
+    - { role: rabbitmq, tags: rabbitmq, when: enable_rabbitmq | bool }
 
 - hosts: keystone
   roles:
-    - keystone
-  tags: keystone
+    - { role: keystone, tags: keystone, when: enable_keystone | bool }
 
-- hosts: glance
+- hosts: [glance-api, glance-registry]
   roles:
-    - glance
-  tags: glance
+    - { role: glance, tags: glance, when: enable_glance | bool }
 
-- hosts:
-    - nova
-    - compute
+- hosts: [nova-api, nova-conductor, nova-consoleauth, nova-novncproxy, nova-scheduler, compute]
   roles:
-    - nova
-  tags: nova
+    - { role: nova, tags: nova, when: enable_nova | bool }
 
-- hosts:
-    - neutron
-    - compute
+- hosts: [neutron-server, neutron-agents, compute]
   roles:
-    - neutron
-  tags: neutron
+    - { role: neutron, tags: neutron, when: enable_neutron | bool }

etc/kolla/defaults.yml

@@ -32,3 +32,14 @@ glance_registry_port: "9191"
 nova_api_port: "8774"
 
 neutron_server_port: "9696"
+
+
+# These roles are required for Kolla to be operation, however a savvy deployer
+# could disable some of these required roles and run thier own services.
+enable_glance: "yes"
+enable_haproxy: "yes"
+enable_keystone: "yes"
+enable_mariadb: "yes"
+enable_neutron: "yes"
+enable_nova: "yes"
+enable_rabbitmq: "yes"