Made rabbitmq use host variables.

rabbitmq.yml

@@ -3,3 +3,5 @@
   become: True
   roles:
       - rabbitmq
+  vars:
+      hostname_node0: "{{ hostvars[groups['rabbitmq'][0]]['ansible_hostname'] }}"

roles/rabbitmq/files/rabbitmq.service

@@ -10,14 +10,14 @@ ExecStartPre=-/usr/bin/docker stop %n
 ExecStartPre=-/usr/bin/docker rm %n
 ExecStartPre=/usr/bin/docker pull rabbitmq:latest
 ExecStart=/usr/bin/docker run \
-          --add-host {{ hostvars[groups['rabbitmq'][0]]['ansible_hostname'] }}:{{ hostvars[groups['rabbitmq'][0]]['ansible_default_ipv4']['address'] }} \
-          --add-host {{ hostvars[groups['rabbitmq'][1]]['ansible_hostname'] }}:{{ hostvars[groups['rabbitmq'][1]]['ansible_default_ipv4']['address'] }} \
-          --add-host {{ hostvars[groups['rabbitmq'][2]]['ansible_hostname'] }}:{{ hostvars[groups['rabbitmq'][2]]['ansible_default_ipv4']['address'] }} \
+          --add-host "{{ hostvars[groups['rabbitmq'][0]]['ansible_hostname'] }}:{{ hostvars[groups['rabbitmq'][0]]['ansible_default_ipv4']['address'] }}" \
+          --add-host "{{ hostvars[groups['rabbitmq'][1]]['ansible_hostname'] }}:{{ hostvars[groups['rabbitmq'][1]]['ansible_default_ipv4']['address'] }}" \
+          --add-host "{{ hostvars[groups['rabbitmq'][2]]['ansible_hostname'] }}:{{ hostvars[groups['rabbitmq'][2]]['ansible_default_ipv4']['address'] }}" \
           -p 4369:4369 -p 25679:25679 -p 25672:25672 -p 5671-5672:5671-5672 -p 8080:15672 \
           -e "RABBITMQ_DEFAULT_USER=user" -e "RABBITMQ_DEFAULT_PASS=password" \
           -e "RABBITMQ_ERLANG_COOKIE=IHyW9HpfbXRL+pZkhGd8pA==" \
           -e "RABBITMQ_NODENAME=rabbit_{{ ansible_nodename }}" \
-          --hostname "{{ansible_nodename}}" --name %n rabbitmq:3-management
+          --hostname "{{ ansible_nodename }}" --name %n rabbitmq:3-management
 
 [Install]
 WantedBy=multi-user.target

roles/rabbitmq/tasks/main.yml

@@ -8,9 +8,18 @@
     mode: 644
     owner: root
     group: root
+
 - name: install service file
   command: systemctl daemon-reload
+
 - name: make sure service is started
   systemd:
     name: rabbitmq.service
     state: started
+
+    #- name: setup the cluster
+    #  command: "docker exec -i rabbitmq.service {{ item }}"
+    #  with_items:
+    #      - rabbitmqctl stop_app
+    #      - "rabbitmqctl join_cluster rabbit_openstack01@{{ hostname_node0 }}"
+    #      - rabbitmqctl start_app