# WARNING: Gateway APIs support is still experimental. Use as your own risk.
#
# NOTE: You need to install the Gateway APIs CRDs before using this example,
#       they are external and can be deployed with the following one-liner:
#
# kubectl kustomize https://github.com/kubernetes-sigs/gateway-api.git/config/crd?ref=master | kubectl apply -f -
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns
data:
  Corefile: |-
    .:53 {
        errors
        health {
           lameduck 5s
        }
        ready
        kubernetes cluster.local in-addr.arpa ip6.arpa {
           pods insecure
           fallthrough in-addr.arpa ip6.arpa
           ttl 30
        }
        forward . /etc/resolv.conf {
           max_concurrent 1000
        }
        cache 30
        loop
        reload
        loadbalance
    }
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: coredns
  labels:
    app: coredns
spec:
  replicas: 1
  selector:
    matchLabels:
      app: coredns
  template:
    metadata:
      labels:
        app: coredns
    spec:
      containers:
      - args:
        - -conf
        - /etc/coredns/Corefile
        image: k8s.gcr.io/coredns/coredns:v1.8.6
        imagePullPolicy: IfNotPresent
        name: coredns
        ports:
        - containerPort: 53
          protocol: UDP
        volumeMounts:
        - mountPath: /etc/coredns
          name: config-volume
      volumes:
      - configMap:
          defaultMode: 420
          items:
          - key: Corefile
            path: Corefile
          name: coredns
        name: config-volume
---
apiVersion: v1
kind: Service
metadata:
  name: coredns
spec:
  ports:
  - port: 53
    protocol: UDP
    targetPort: 53
  selector:
    app: coredns
  type: ClusterIP
---
kind: GatewayClass
apiVersion: gateway.networking.k8s.io/v1alpha2
metadata:
  name: kong
spec:
  controllerName: konghq.com/kic-gateway-controller
---
kind: Gateway
apiVersion: gateway.networking.k8s.io/v1alpha2
metadata:
  name: kong
spec:
  gatewayClassName: kong
  listeners:
  - name: http
    protocol: HTTP
    port: 80
  - name: dns
    protocol: UDP
    port: 53
---
apiVersion: gateway.networking.k8s.io/v1alpha2
kind: UDPRoute
metadata:
  name: coredns
spec:
  parentRefs:
  - name: kong
  rules:
  - backendRefs:
    - name: coredns
      port: 53