Cluster all to one machine.

Alsa, add connection logging to rabbitmq.

playbooks/edx-east/cluster_rabbitmq.yml

 
-# ansible-playbook -i ec2.py commoncluster.yml --limit tag_Name_stage-edx-commoncluster -e@/path/to/vars/env-deployment.yml -T 30 --list-hosts
+# ansible-playbook -i ec2.py cluster_rabbitmq.yml --limit tag_Name_stage-edx-commoncluster -e@/path/to/vars/env-deployment.yml -T 30 --list-hosts
 
 - hosts: all
   sudo: True
@@ -28,14 +28,14 @@
   tasks:
     - debug: msg="{{ ansible_ec2_local_ipv4 }}"
       with_items: list.results
-    - shell: echo "rabbit@ip-{{ item|replace('.', '-') }}"
-      when: item != ansible_ec2_local_ipv4
-      with_items: hostvars.keys()
-      register: list
+#    - name: The main ip to cluster to.
+#      shell: echo "rabbit@ip-{{ item|replace('.', '-') }}"
+#      when: item != ansible_ec2_local_ipv4
+#      with_items: hostvars.keys()
+#      register: list
     - command: rabbitmqctl stop_app
-    - command: rabbitmqctl join_cluster {{ item.stdout }}
-      when: item.stdout is defined
-      with_items: list.results
+    - command: rabbitmqctl join_cluster rabbit@ip-{{ hostvars.keys()[0]|replace('.', '-') }}
+      when: hostvars.keys()[0] != ansible_ec2_local_ipv4
     - command: rabbitmqctl start_app
   post_tasks:
     - debug: var="{{ ansible_ec2_instance_id }}"

playbooks/roles/rabbitmq/templates/etc/rabbitmq/rabbitmq.config.j2

 % {{ ansible_managed }}
 
+[{rabbit,
+  {log_levels, [{connection, info}]},
 {% if RABBITMQ_CLUSTERED -%}
   {%- set hosts= [] -%}
 
@@ -7,14 +9,12 @@
     {% do hosts.append("rabbit@ip-" + host.replace('.','-')) %}
   {%- endfor %}
 
-[{rabbit,
-  [{cluster_nodes, {['{{ hosts|join("\',\'") }}'], disc}}]}].
+  [{cluster_nodes, {['{{ hosts|join("\',\'") }}'], disc}}]
 
 {%- else -%}
 {# If rabbitmq_clustered_hosts is set, use that instead assuming an aws stack.
    Note: That these names should include the node name prefix. eg. 'rabbit@hostname'
 #}
-[{rabbit,
-  [{cluster_nodes, {['{{ rabbitmq_clustered_hosts|join("\',\'") }}'], disc}}]}].
-
+  [{cluster_nodes, {['{{ rabbitmq_clustered_hosts|join("\',\'") }}'], disc}}]
 {%- endif -%}
+}].