diff --git a/tasks/main.yml b/tasks/main.yml
index 906e836..6df4379 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -1,8 +1,28 @@
 ---
 # tasks file for /Users/carlosfrias/apigee-workspace/opdk-workspace/apigee-opdk-setup-postgresql-add
+- name: Set attributes if available
+  ignore_errors: true
+  set_fact:
+    pgmaster_group_name: "{{ pgmaster_group_name | default('pgmaster') }}"
+    pgstandby_group_name: "{{ pgstandby_group_name | default('pgstandby') }}"
+    master_uuid: "{{ hostvars[groups[pgmaster_group_name][0]].edge_ps_self.uUID }}"
+    standby_uuid: "{{ hostvars[groups[pgstandby_group_name][0]].edge_ps_self.uUID }}"
+    server_type: "{{ hostvars[groups[pgmaster_group_name][0]].edge_ps_self.type[0] }}"
+
+- name: Assert that attributes are available.
+  assert:
+    that:
+      - "ax_group is defined and ax_group | trim | length > 0"
+      - "consumer_group is defined and consumer_group | trim | length > 0"
+      - "server_type is defined and server_type | trim | length > 0"
+      - "master_uuid is defined and uuid | trim | length > 0"
+      - "standby_uuid is defined and uuid | trim | length > 0"
+    msg: "Please provide the missing attribute"
+
 - name: Construct uuid for master,standby
   set_fact:
-    master_standby_uuid: "{{ hostvars[groups[pgmaster_group_name][0]].edge_ps_self.uUID }},{{ hostvars[groups[pgstandby_group_name][0]].edge_ps_self.uUID }}"
+    master_standby_uuid: "{{ master_uuid }},{{ standby_uuid }}"
+  when: master_standby_uuid is not defined
 
 - name: Add postgres server
   uri:
@@ -10,7 +30,7 @@
     password: '{{ opdk_user_pass }}'
     method: POST
     body_format: json
-    url: http://{{ local_mgmt_ip }}:8080/v1/analytics/groups/ax/{{ ax_group }}/servers?uuid={{ master_standby_uuid}}&type={{ hostvars[groups[pgmaster_group_name][0]].edge_ps_self.type[0] }}&force=true
+    url: http://{{ local_mgmt_ip }}:8080/v1/analytics/groups/ax/{{ ax_group }}/servers?uuid={{ master_standby_uuid }}&type={{ server_type }}&force=true
 
 - name: Add postgres to consumer groups
   uri: