Add a play for the mongo servers.

playbooks/edx-east/edx_feanilsandbox.yml

 ---
-- hosts: tag_aws_cloudformation_stack-name_feanilsandbox:&tag_group_edxapp
+- hosts: tag_aws_cloudformation_stack-name_feanilsandbox:&tag_role_edxapp
   sudo: True
   vars_files:
     - "{{ secure_dir }}/vars/dev/feanilsandbox.yml"
@@ -18,7 +18,7 @@
       edxapp_lms_env: 'lms.envs.load_test'
       edx_platform_commit: 'release'
     - splunkforwarder
-- hosts: tag_aws_cloudformation_stack-name_feanilsandbox:&tag_group_worker
+- hosts: tag_aws_cloudformation_stack-name_feanilsandbox:&tag_role_worker
   sudo: True
   vars_files:
     - "{{ secure_dir }}/vars/dev/feanilsandbox.yml"
@@ -38,7 +38,7 @@
       celery_worker: True
       edx_platform_commit: 'release'
     - splunkforwarder
-- hosts: tag_aws_cloudformation_stack-name_feanilsandbox:&tag_group_xserver
+- hosts: tag_aws_cloudformation_stack-name_feanilsandbox:&tag_role_xserver
   sudo: True
   vars_files:
     - "{{ secure_dir }}/vars/dev/feanilsandbox.yml"
@@ -51,7 +51,7 @@
       - xserver
     - xserver
     - splunkforwarder
-- hosts: tag_aws_cloudformation_stack-name_feanilsandbox:&tag_group_rabbitmq
+- hosts: tag_aws_cloudformation_stack-name_feanilsandbox:&tag_role_rabbitmq
   serial: 1
   sudo: True
   vars_files:
@@ -62,7 +62,7 @@
     - supervisor
     - rabbitmq
     - splunkforwarder
-- hosts: tag_aws_cloudformation_stack-name_feanilsandbox:&tag_group_xqueue
+- hosts: tag_aws_cloudformation_stack-name_feanilsandbox:&tag_role_xqueue
   sudo: True
   vars_files:
     - "{{ secure_dir }}/vars/dev/feanilsandbox.yml"
@@ -75,3 +75,12 @@
       - xqueue
     - xqueue
     - splunkforwarder
+- hosts: tag_aws_cloudformation_stack-name_feanilsandbox:&tag_role_mongo
+  sudo: True
+  vars_files:
+    - "{{ secure_dir }}/vars/dev/feanilsandbox.yml"
+    - "{{ secure_dir }}/vars/users.yml"
+  roles:
+    - common
+    - role: 'mongo'
+      mongo_clustered: true