apiVersion: apps/v1
kind: Deployment
metadata:
  name: coredns
  namespace: kube-system
  uid: 7bf78c83-68ac-4dee-95f6-52964e38e2d3
  resourceVersion: '441765420'
  generation: 37
  creationTimestamp: '2021-01-20T14:55:14Z'
  labels:
    k8s-app: kube-dns
  annotations:
    deployment.kubernetes.io/revision: '34'
spec:
  replicas: 2
  selector:
    matchLabels:
      k8s-app: kube-dns
  template:
    metadata:
      creationTimestamp: null
      labels:
        k8s-app: kube-dns
    spec:
      volumes:
        - name: config-volume
          configMap:
            name: coredns
            items:
              - key: Corefile
                path: Corefile
            defaultMode: 420
      containers:
        - name: coredns
          image: registry.k8s.io/coredns/coredns:v1.9.3
          args:
            - '-conf'
            - /etc/coredns/Corefile
          ports:
            - name: dns
              containerPort: 53
              protocol: UDP
            - name: dns-tcp
              containerPort: 53
              protocol: TCP
            - name: metrics
              containerPort: 9153
              protocol: TCP
          resources:
            limits:
              memory: 170Mi
            requests:
              cpu: 100m
              memory: 70Mi
          volumeMounts:
            - name: config-volume
              readOnly: true
              mountPath: /etc/coredns
          livenessProbe:
            httpGet:
              path: /health
              port: 8080
              scheme: HTTP
            initialDelaySeconds: 60
            timeoutSeconds: 5
            periodSeconds: 10
            successThreshold: 1
            failureThreshold: 5
          readinessProbe:
            httpGet:
              path: /ready
              port: 8181
              scheme: HTTP
            timeoutSeconds: 1
            periodSeconds: 10
            successThreshold: 1
            failureThreshold: 3
          terminationMessagePath: /dev/termination-log
          terminationMessagePolicy: File
          imagePullPolicy: IfNotPresent
          securityContext:
            capabilities:
              add:
                - NET_BIND_SERVICE
              drop:
                - all
            readOnlyRootFilesystem: true
            allowPrivilegeEscalation: false
      restartPolicy: Always
      terminationGracePeriodSeconds: 30
      dnsPolicy: Default
      nodeSelector:
        kubernetes.io/os: linux
      serviceAccountName: coredns
      serviceAccount: coredns
      securityContext: {}
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
            - weight: 100
              podAffinityTerm:
                labelSelector:
                  matchExpressions:
                    - key: k8s-app
                      operator: In
                      values:
                        - kube-dns
                topologyKey: kubernetes.io/hostname
      schedulerName: default-scheduler
      tolerations:
        - key: CriticalAddonsOnly
          operator: Exists
        - key: node-role.kubernetes.io/control-plane
          effect: NoSchedule
      priorityClassName: system-cluster-critical
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
      maxSurge: 25%
  revisionHistoryLimit: 10
  progressDeadlineSeconds: 600