Add option to [not] install coredns via Kubespray

roles/kubernetes-apps/ansible/defaults/main.yml

@@ -20,7 +20,7 @@ coredns_default_zone_cache_block: |
 coredns_pod_disruption_budget: false
 # value for coredns pdb
 coredns_pod_disruption_budget_max_unavailable: "30%"
-
+deploy_coredns: true
 # coredns_additional_configs adds any extra configuration to coredns
 # coredns_additional_configs: |
 #   whoami

roles/kubernetes-apps/ansible/tasks/main.yml

@@ -22,7 +22,9 @@
     - coredns
   vars:
     clusterIP: "{{ skydns_server }}"
-  when: dns_mode in ['coredns', 'coredns_dual']
+  when:
+    - dns_mode in ['coredns', 'coredns_dual']
+    - deploy_coredns
 
 - name: Kubernetes Apps | CoreDNS Secondary
   command:
@@ -38,6 +40,7 @@
     coredns_ordinal_suffix: "-secondary"
   when:
     - dns_mode == 'coredns_dual'
+    - deploy_coredns
 
 - name: Kubernetes Apps | nodelocalDNS
   command: