Add CoreDNS endpoint_pod_names option (#5012)

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

@@ -14,6 +14,9 @@ data:
         ready
         kubernetes {{ dns_domain }} in-addr.arpa ip6.arpa {
           pods insecure
+{% if enable_coredns_k8s_endpoint_pod_names %}
+          endpoint_pod_names
+{% endif %}
 {% if resolvconf_mode == 'host_resolvconf' and upstream_dns_servers is defined and upstream_dns_servers|length > 0 %}
           upstream {{ upstream_dns_servers|join(' ') }}
 {% else %}

roles/kubespray-defaults/defaults/main.yaml

@@ -92,6 +92,8 @@ dns_servers: "{{kube_dns_servers[dns_mode]}}"
 enable_coredns_k8s_external: false
 coredns_k8s_external_zone: k8s_external.local
 
+enable_coredns_k8s_endpoint_pod_names: false
+
 # Kubernetes configuration dirs and system namespace.
 # Those are where all the additional config stuff goes
 # the kubernetes normally puts in /srv/kubernetes.