Add selectable dns policy for kube-router (#6586)

inventory/sample/group_vars/k8s-cluster/k8s-net-kube-router.yml

@@ -39,6 +39,9 @@
 # https://github.com/cloudnativelabs/kube-router/blob/master/docs/user-guide.md#hairpin-mode
 # kube_router_support_hairpin_mode: false
 
+# Select DNS Policy ClusterFirstWithHostNet, ClusterFirst, etc.
+# kube_router_dns_policy: ClusterFirstWithHostNet
+
 # Array of annotations for master
 # kube_router_annotations_master: []
 

roles/network_plugin/kube-router/defaults/main.yml

@@ -38,6 +38,9 @@ kube_router_peer_router_ports: ~
 # https://github.com/cloudnativelabs/kube-router/blob/master/docs/user-guide.md#hairpin-mode
 kube_router_support_hairpin_mode: false
 
+# Select DNS Policy ClusterFirstWithHostNet, ClusterFirst, etc.
+kube_router_dns_policy: ClusterFirstWithHostNet
+
 # Adds annotations to kubernetes nodes for advanced configuration of BGP Peers.
 # https://github.com/cloudnativelabs/kube-router/blob/master/docs/bgp.md
 

roles/network_plugin/kube-router/templates/kube-router.yml.j2

@@ -109,7 +109,7 @@ spec:
           protocol: TCP
 {% endif %}
       hostNetwork: true
-      dnsPolicy: ClusterFirstWithHostNet
+      dnsPolicy: {{ kube_router_dns_policy }}
 {% if kube_router_enable_dsr %}
       hostIPC: true
       hostPID: true