Used hostnames instead of IPs.

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

@@ -6,7 +6,7 @@
   {%- if name.startswith("tag_aws_cloudformation_stack-name_") -%}
     {%- for host in groups.tag_group_rabbitmq -%}
       {%- if host in groups[name] -%}
-        {% do hosts.append("rabbit@" + host) %}
+        {% do hosts.append("rabbit@ip-" + host.replace('.','-')) %}
       {%- endif -%}
     {%- endfor -%}
   {%- endif -%}