default to kubedns and set nxdomain in kubedns deployment if that's the dns_mode

inventory/group_vars/k8s-cluster.yml

@@ -98,7 +98,7 @@ cluster_name: cluster.local
 # Subdomains of DNS domain to be resolved via /etc/resolv.conf for hostnet pods
 ndots: 2
 # Can be dnsmasq_kubedns, kubedns or none
-dns_mode: dnsmasq_kubedns
+dns_mode: kubedns
 # Can be docker_dns, host_resolvconf or none
 resolvconf_mode: docker_dns
 # Deploy netchecker app to verify DNS resolve as an HTTP service

roles/kubernetes-apps/ansible/templates/kubedns-deploy.yml

@@ -82,6 +82,9 @@ spec:
         - --server=127.0.0.1#10053
 {% if kube_log_level == '4' %}
         - --log-queries
+{% endif %}
+{% if dns_mode == 'kubedns' %}
+        - --local=/{{ bogus_domains }}
 {% endif %}
         ports:
         - containerPort: 53