kubespray/roles/kubernetes-apps/ansible/templates/kubedns-svc.yml

---
apiVersion: v1
kind: Service
metadata:
  name: kube-dns
  namespace: {{ system_namespace }}
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    kubernetes.io/name: "KubeDNS"
spec:
  selector:
    k8s-app: kube-dns
  clusterIP: {{ skydns_server }}
  ports:
  - name: dns
    port: 53
    protocol: UDP
  - name: dns-tcp
    port: 53
    protocol: TCP