diff --git a/coredns.yaml b/coredns.yaml new file mode 100644 index 0000000..500a49e --- /dev/null +++ b/coredns.yaml @@ -0,0 +1,222 @@ +apiVersion: v1 +kind: ServiceAccount +metadata: + name: coredns + namespace: kube-system +--- +apiVersion: rbac.authorization.k8s.io/v1 +kind: ClusterRole +metadata: + labels: + kubernetes.io/bootstrapping: rbac-defaults + name: system:coredns +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:coredns +roleRef: + apiGroup: rbac.authorization.k8s.io + kind: ClusterRole + name: system:coredns +subjects: +- kind: ServiceAccount + name: coredns + namespace: kube-system +--- +apiVersion: v1 +kind: ConfigMap +metadata: + name: coredns + namespace: kube-system +data: + Corefile: | + .:53 { + errors + health + ready + kubernetes cluster.local in-addr.arpa ip6.arpa { + pods insecure + fallthrough in-addr.arpa ip6.arpa + } + hosts /etc/coredns/NodeHosts { + ttl 60 + reload 15s + fallthrough + } + prometheus :9153 + cache 30 + loop + reload + loadbalance + import /etc/coredns/custom/*.override + forward . /etc/resolv.conf + } + import /etc/coredns/custom/*.server +--- +apiVersion: apps/v1 +kind: Deployment +metadata: + name: coredns + namespace: kube-system + labels: + k8s-app: kube-dns + kubernetes.io/name: "CoreDNS" +spec: + revisionHistoryLimit: 0 + strategy: + type: RollingUpdate + rollingUpdate: + maxUnavailable: 1 + selector: + matchLabels: + k8s-app: kube-dns + template: + metadata: + labels: + k8s-app: kube-dns + spec: + priorityClassName: "system-cluster-critical" + serviceAccountName: coredns + tolerations: + - key: "CriticalAddonsOnly" + operator: "Exists" + - key: "node-role.kubernetes.io/control-plane" + operator: "Exists" + effect: "NoSchedule" + nodeSelector: + kubernetes.io/os: linux + topologySpreadConstraints: + - maxSkew: 1 + topologyKey: kubernetes.io/hostname + whenUnsatisfiable: DoNotSchedule + labelSelector: + matchLabels: + k8s-app: kube-dns + - maxSkew: 1 + topologyKey: topology.kubernetes.io/zone + whenUnsatisfiable: ScheduleAnyway + labelSelector: + matchLabels: + k8s-app: kube-dns + containers: + - name: coredns + image: "rancher/mirrored-coredns-coredns:1.14.1" + imagePullPolicy: IfNotPresent + resources: + limits: + memory: 170Mi + requests: + cpu: 100m + memory: 70Mi + args: [ "-conf", "/etc/coredns/Corefile" ] + volumeMounts: + - name: config-volume + mountPath: /etc/coredns + readOnly: true + - name: custom-config-volume + mountPath: /etc/coredns/custom + 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 + periodSeconds: 10 + timeoutSeconds: 1 + successThreshold: 1 + failureThreshold: 3 + readinessProbe: + httpGet: + path: /ready + port: 8181 + scheme: HTTP + initialDelaySeconds: 0 + periodSeconds: 2 + timeoutSeconds: 1 + successThreshold: 1 + failureThreshold: 3 + dnsPolicy: Default + volumes: + - name: config-volume + configMap: + name: coredns + items: + - key: Corefile + path: Corefile + - key: NodeHosts + path: NodeHosts + - name: custom-config-volume + configMap: + name: coredns-custom + optional: true +--- +apiVersion: v1 +kind: Service +metadata: + name: kube-dns + namespace: kube-system + annotations: + prometheus.io/port: "9153" + prometheus.io/scrape: "true" + labels: + k8s-app: kube-dns + kubernetes.io/cluster-service: "true" + kubernetes.io/name: "CoreDNS" +spec: + selector: + k8s-app: kube-dns + clusterIP: 10.43.0.10 + clusterIPs: [10.43.0.10] + ports: + - name: dns + port: 53 + protocol: UDP + - name: dns-tcp + port: 53 + protocol: TCP + - name: metrics + port: 9153 + protocol: TCP + ipFamilyPolicy: SingleStack