Error in check mode on cluster slave node

[lurkie]

When running in check mode, the task 'ensure rabbitmq cluster member' fails, because variable rabbitmq_output is not available as the rabbitmqctl command from the previous task has not run.

Also, the current tasks will always restart rabbitmq app when Ansible runs.

[lurkie]

The following patch resolves my issue

index 6965682..8de5a80 100644
--- a/tasks/cluster.yml
+++ b/tasks/cluster.yml
@@ -10,6 +10,7 @@
 - name: ensure rabbitmq cluster member
   fail: msg="Unable to join the cluster."
   when: ("'already_member' not in rabbitmq_output.stderr") and rabbitmq_output.rc != 0
+  ignore_errors: "{{ ansible_check_mode }}"
 
 - name: start rabbitmq app
   shell: rabbitmqctl start_app