raven-proxy-dns.yaml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: raven-proxy-dns
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:raven-proxy-dns
rules:
  - apiGroups:
      - ""
    resources:
      - endpoints
      - services
      - pods
      - namespaces
    verbs:
      - list
      - watch
  - apiGroups:
      - discovery.k8s.io
    resources:
      - endpointslices
    verbs:
      - list
      - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:raven-proxy-dns
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:raven-proxy-dns
subjects:
  - kind: ServiceAccount
    name: raven-proxy-dns
    namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: raven-proxy-dns
  namespace: kube-system
data:
  Corefile: |
    .:53 {
        errors
        health {
          lameduck 5s
        }
        ready
        hosts /etc/edge/tunnel-nodes {
            reload 300ms
            fallthrough
        }
        kubernetes cluster.local in-addr.arpa ip6.arpa {
           pods insecure
           fallthrough in-addr.arpa ip6.arpa
           ttl 30
        }
        prometheus :9153
        forward . /etc/resolv.conf {
          max_concurrent 1000
        }
        cache 30
        loop
        reload
        loadbalance
    }
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: edge-tunnel-nodes
  namespace: kube-system
data:
  tunnel-nodes: |
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: raven-proxy-dns
  namespace: kube-system
  labels:
    k8s-app: raven-proxy-dns
    kubernetes.io/name: "CoreDNS"
spec:
  replicas: 1
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
  selector:
    matchLabels:
      k8s-app: raven-proxy-dns
  template:
    metadata:
      labels:
        k8s-app: raven-proxy-dns
    spec:
      serviceAccountName: raven-proxy-dns
      priorityClassName: system-cluster-critical
      tolerations:
        - operator: "Exists"
      nodeSelector:
        kubernetes.io/os: linux
        openyurt.io/is-edge-worker: "false"
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: k8s-app
                    operator: In
                    values: ["raven-proxy-dns"]
              topologyKey: kubernetes.io/hostname
      containers:
        - name: raven-proxy-dns
          image: coredns/coredns:1.9.3
          imagePullPolicy: IfNotPresent
          resources:
            limits:
              memory: 170Mi
            requests:
              cpu: 100m
              memory: 70Mi
          args: [ "-conf", "/etc/raven-proxy-dns/Corefile" ]
          volumeMounts:
            - name: config-volume
              mountPath: /etc/raven-proxy-dns
              readOnly: true
            - name: hosts
              mountPath: /etc/edge
              readOnly: true
          ports:
            - containerPort: 53
              name: dns
              protocol: UDP
            - containerPort: 53
              name: dns-tcp
              protocol: TCP
            - containerPort: 9153
              name: metrics
              protocol: TCP
          securityContext:
            allowPrivilegeEscalation: false
            capabilities:
              add:
                - NET_BIND_SERVICE
              drop:
                - all
            readOnlyRootFilesystem: true
          livenessProbe:
            httpGet:
              path: /health
              port: 8080
              scheme: HTTP
            initialDelaySeconds: 60
            timeoutSeconds: 5
            successThreshold: 1
            failureThreshold: 5
          readinessProbe:
            httpGet:
              path: /ready
              port: 8181
              scheme: HTTP
      dnsPolicy: Default
      volumes:
        - name: config-volume
          configMap:
            name: raven-proxy-dns
            items:
              - key: Corefile
                path: Corefile
        - name: hosts
          configMap:
            name: edge-tunnel-nodes
            defaultMode: 420
---
apiVersion: v1
kind: Service
metadata:
  name: raven-proxy-dns
  namespace: kube-system
  annotations:
    prometheus.io/port: "9153"
    prometheus.io/scrape: "true"
  labels:
    k8s-app: raven-proxy-dns
spec:
  selector:
    k8s-app: raven-proxy-dns
  type: ClusterIP
  ports:
    - name: dns
      port: 53
      protocol: UDP
    - name: dns-tcp
      port: 53
      protocol: TCP
    - name: metrics
      port: 9153
      protocol: TCP