apiVersion: v1
kind: ServiceAccount
metadata:
  name: node-local-dns
  namespace: kube-system
  labels:
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
---
apiVersion: v1
kind: Service
metadata:
  name: kube-dns-upstream
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    kubernetes.io/name: "KubeDNSUpstream"
spec:
  ports:
    - name: dns
      port: 53
      protocol: UDP
      targetPort: 53
    - name: dns-tcp
      port: 53
      protocol: TCP
      targetPort: 53
  selector:
    k8s-app: kube-dns
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: node-local-dns
  namespace: kube-system
  labels:
    addonmanager.kubernetes.io/mode: Reconcile
data:
  Corefile: |
    # 腾讯云内网DNS会将HINFO解析请求返回本机 造成循环 此处直接屏蔽处理
    (disableHINFO) {
      template ANY HINFO . {
        rcode NXDOMAIN
      }
    }
    cluster.local:53 {
      errors
      cache {
        success 9984 30
        denial 9984 5
      }
      reload
      loop
      bind 169.254.20.10 10.43.0.10
      forward . __PILLAR__CLUSTER__DNS__ {
        force_tcp
      }
      prometheus :9253
      health 169.254.20.10:8080
      import disableHINFO
    }
    in-addr.arpa:53 {
      errors
      cache 30
      reload
      loop
      bind 169.254.20.10 10.43.0.10
      forward . __PILLAR__CLUSTER__DNS__ {
        force_tcp
      }
      prometheus :9253
      import disableHINFO
    }
    ip6.arpa:53 {
      errors
      cache 30
      reload
      loop
      bind 169.254.20.10 10.43.0.10
      forward . __PILLAR__CLUSTER__DNS__ {
        force_tcp
      }
      prometheus :9253
      import disableHINFO
    }
    .:53 {
      errors
      cache 30
      reload
      loop
      bind 169.254.20.10 10.43.0.10
      forward . __PILLAR__UPSTREAM__SERVERS__
      prometheus :9253
      import disableHINFO
    }
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: node-local-dns
  namespace: kube-system
  labels:
    k8s-app: node-local-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
spec:
  updateStrategy:
    rollingUpdate:
      maxUnavailable: 10%
  selector:
    matchLabels:
      k8s-app: node-local-dns
  template:
    metadata:
      labels:
        k8s-app: node-local-dns
      annotations:
        prometheus.io/port: "9253"
        prometheus.io/scrape: "true"
    spec:
      # master节点不启用
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                  - key: node-role.kubernetes.io/master
                    operator: NotIn
                    values:
                      - "true"
      priorityClassName: system-node-critical
      serviceAccountName: node-local-dns
      hostNetwork: true
      dnsPolicy: Default  # Don't use cluster DNS.
      tolerations:
        - key: "CriticalAddonsOnly"
          operator: "Exists"
        - effect: "NoExecute"
          operator: "Exists"
        - effect: "NoSchedule"
          operator: "Exists"
      containers:
        - name: node-cache
          image: registry.k8s.io/dns/k8s-dns-node-cache:1.25.0
          resources:
            requests:
              cpu: 25m
              memory: 5Mi
          args: [ "-localip", "169.254.20.10,10.43.0.10", "-conf", "/etc/Corefile", "-upstreamsvc", "kube-dns-upstream" ]
          securityContext:
            capabilities:
              add:
                - NET_ADMIN
          ports:
            - containerPort: 53
              name: dns
              protocol: UDP
            - containerPort: 53
              name: dns-tcp
              protocol: TCP
            - containerPort: 9253
              name: metrics
              protocol: TCP
          livenessProbe:
            httpGet:
              host: 169.254.20.10
              path: /health
              port: 8080
            initialDelaySeconds: 60
            timeoutSeconds: 5
          volumeMounts:
            - mountPath: /run/xtables.lock
              name: xtables-lock
              readOnly: false
            - name: config-volume
              mountPath: /etc/coredns
            - name: kube-dns-config
              mountPath: /etc/kube-dns
      volumes:
        - name: xtables-lock
          hostPath:
            path: /run/xtables.lock
            type: FileOrCreate
        - name: kube-dns-config
          configMap:
            name: kube-dns
            optional: true
        - name: config-volume
          configMap:
            name: node-local-dns
            items:
              - key: Corefile
                path: Corefile.base
---
apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/port: "9253"
    prometheus.io/scrape: "true"
  labels:
    k8s-app: node-local-dns
  name: node-local-dns
  namespace: kube-system
spec:
  clusterIP: None
  ports:
    - name: metrics
      port: 9253
      targetPort: 9253
  selector:
    k8s-app: node-local-dns