Add a RabbitMQ vhost for pubsub (fedmsg) and configure an HA policy

Since many of our applications will likely wish to use RabbitMQ for
private things like work queues, using separate vhosts is a good idea.
This sets up a single vhost to act as a fedmsg replacement (called
pubsub) and configures it for high availability.

The HA policy mirrors queues to all nodes in the cluster and enables
automatic synchronization with a batch size of 10K messages. Automatic
synchronization means that when a new node joins the cluster, all
messages from existing nodes are pushed to the new node, blocking queue
activity until mirroring is complete.

Signed-off-by: Jeremy Cline <jcline@redhat.com>

roles/rabbitmq_cluster/files/enabled_plugins

@@ -1 +0,0 @@
-[rabbitmq_management,rabbitmq_auth_mechanism_ssl].

roles/rabbitmq_cluster/tasks/main.yml

@@ -52,15 +52,6 @@
   - rabbitmq_cluster
   - config
 
-- name: enable plugins
-  copy: src=enabled_plugins dest=/etc/rabbitmq/enabled_plugins owner=root group=root mode=0644
-  with_items:
-  - rabbitmq.config
-  - enabled_plugins
-  tags:
-  - rabbitmq_cluster
-  - config
-
 - name: deploy configuration
   template: src={{item}} dest=/etc/rabbitmq/{{item}} owner=root group=root mode=0644
   with_items:
@@ -96,6 +87,13 @@
   - rabbitmq_cluster
   - config
 
+- name: Enable the HTTP management console and SSL authentication plugins
+  rabbitmq_plugin:
+    names: rabbitmq_management,rabbitmq_auth_mechanism_ssl
+  tags:
+  - rabbitmq_cluster
+  - config
+
 - name: start rabbitmq
   service: name=rabbitmq-server state=started enabled=yes
   tags:
@@ -106,3 +104,25 @@
   tags:
   - rabbitmq_cluster
   - config
+
+- name: Configure the pubsub virtual host
+  rabbitmq_vhost:
+    name: /pubsub
+    state: present
+  tags:
+  - rabbitmq_cluster
+  - config
+
+- name: Configure the HA policy for queues on the pubsub virtual
+  rabbitmq_policy:
+    name: HA
+    apply_to: queues
+    pattern: .*
+    tags:
+      ha-mode: all
+      ha-sync-mode: automatic  # Auto sync queues to new cluster members
+      ha-sync-batch-size: 10000  # Larger is faster, but must finish in 1 net_ticktime
+    vhost: /pubsub
+  tags:
+  - rabbitmq_cluster
+  - config