apiVersion: v1
kind: Service
metadata:
  name: coredns
  namespace: dns
spec:
  ports:
  - name: coredns
    port: 53
    protocol: UDP
    targetPort: 53
  selector:
    app: coredns
  type: LoadBalancer
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns
  namespace: dns
data:
  Corefile: |
    open-it.intra {
        errors
        health
        log
        etcd {
           endpoint http://etcd-dns:2379
        }
        cache 30
        prometheus 0.0.0.0:9153
    }
    
    . {
        forward . 192.168.1.1
        cache
    }
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: coredns
  namespace: dns
  labels:
    app: coredns
spec:
  replicas: 3
  selector:
    matchLabels:
      app: coredns
  template:
    metadata:
      labels:
        app: coredns
        k8s_app: kube-dns
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "9153"
        prometheus.io/path: /metrics
    spec:
      containers:
      - name: coredns
        image: coredns/coredns:latest
        imagePullPolicy: IfNotPresent
        args: [ "-conf", "/etc/coredns/Corefile" ]
        volumeMounts:
        - name: config-volume
          mountPath: /etc/coredns
        ports:
        - containerPort: 53
          name: dns
          protocol: UDP
        - containerPort: 53
          name: dns-tcp
          protocol: TCP
        - containerPort: 9153
          name: metrics
          protocol: TCP
      volumes:
      - name: config-volume
        configMap:
          name: coredns
          items:
          - key: Corefile
            path: Corefile