coredns: allow to customize service name (#12951)

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

@@ -11,6 +11,7 @@ dns_nodes_per_replica: 16
 dns_cores_per_replica: 256
 dns_prevent_single_point_failure: "{{ 'true' if dns_min_replicas | int > 1 else 'false' }}"
 enable_coredns_reverse_dns_lookups: true
+coredns_svc_name: "coredns"
 coredns_ordinal_suffix: ""
 # dns_extra_tolerations: [{effect: NoSchedule, operator: "Exists"}]
 coredns_affinity:

roles/kubernetes-apps/ansible/templates/coredns-svc.yml.j2

@@ -2,7 +2,7 @@
 apiVersion: v1
 kind: Service
 metadata:
-  name: coredns{{ coredns_ordinal_suffix }}
+  name: {{ coredns_svc_name }}{{ coredns_ordinal_suffix }}
   namespace: kube-system
   labels:
     k8s-app: kube-dns{{ coredns_ordinal_suffix }}