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HuaYu
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## 配置
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```shell
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cat > coredns.yaml << "EOF"
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: coredns
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namespace: kube-system
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRole
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metadata:
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labels:
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kubernetes.io/bootstrapping: rbac-defaults
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name: system:coredns
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rules:
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- apiGroups:
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- ""
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resources:
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- endpoints
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- services
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- pods
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- namespaces
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verbs:
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- list
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- watch
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- apiGroups:
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- discovery.k8s.io
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resources:
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- endpointslices
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verbs:
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- list
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- watch
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRoleBinding
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metadata:
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annotations:
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rbac.authorization.kubernetes.io/autoupdate: "true"
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labels:
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kubernetes.io/bootstrapping: rbac-defaults
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name: system:coredns
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: ClusterRole
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name: system:coredns
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subjects:
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- kind: ServiceAccount
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name: coredns
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namespace: kube-system
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---
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: coredns
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namespace: kube-system
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data:
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Corefile: |
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.:53 {
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errors
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health {
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lameduck 5s
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}
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ready
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kubernetes cluster.local in-addr.arpa ip6.arpa {
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fallthrough in-addr.arpa ip6.arpa
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}
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prometheus :9153
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forward . /etc/resolv.conf {
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max_concurrent 1000
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}
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cache 30
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loop
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reload
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loadbalance
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}
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: coredns
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namespace: kube-system
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labels:
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k8s-app: kube-dns
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kubernetes.io/name: "CoreDNS"
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spec:
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# replicas: not specified here:
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# 1. Default is 1.
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# 2. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
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strategy:
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type: RollingUpdate
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rollingUpdate:
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maxUnavailable: 1
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selector:
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matchLabels:
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k8s-app: kube-dns
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template:
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metadata:
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labels:
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k8s-app: kube-dns
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spec:
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priorityClassName: system-cluster-critical
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serviceAccountName: coredns
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tolerations:
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- key: "CriticalAddonsOnly"
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operator: "Exists"
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nodeSelector:
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kubernetes.io/os: linux
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affinity:
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podAntiAffinity:
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preferredDuringSchedulingIgnoredDuringExecution:
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- weight: 100
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podAffinityTerm:
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labelSelector:
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matchExpressions:
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- key: k8s-app
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operator: In
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values: ["kube-dns"]
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topologyKey: kubernetes.io/hostname
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containers:
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- name: coredns
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image: coredns/coredns:1.8.4
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imagePullPolicy: IfNotPresent
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resources:
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limits:
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memory: 170Mi
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requests:
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cpu: 100m
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memory: 70Mi
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args: [ "-conf", "/etc/coredns/Corefile" ]
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volumeMounts:
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- name: config-volume
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mountPath: /etc/coredns
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readOnly: true
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ports:
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- containerPort: 53
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name: dns
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protocol: UDP
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- containerPort: 53
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name: dns-tcp
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protocol: TCP
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- containerPort: 9153
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name: metrics
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protocol: TCP
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securityContext:
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allowPrivilegeEscalation: false
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capabilities:
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add:
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- NET_BIND_SERVICE
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drop:
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- all
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readOnlyRootFilesystem: true
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livenessProbe:
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httpGet:
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path: /health
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port: 8080
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scheme: HTTP
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initialDelaySeconds: 60
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 5
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readinessProbe:
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httpGet:
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path: /ready
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port: 8181
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scheme: HTTP
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dnsPolicy: Default
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volumes:
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- name: config-volume
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configMap:
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name: coredns
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items:
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- key: Corefile
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path: Corefile
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: kube-dns
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namespace: kube-system
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annotations:
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prometheus.io/port: "9153"
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prometheus.io/scrape: "true"
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labels:
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k8s-app: kube-dns
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kubernetes.io/cluster-service: "true"
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kubernetes.io/name: "CoreDNS"
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spec:
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selector:
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k8s-app: kube-dns
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clusterIP: 10.96.0.2
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ports:
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- name: dns
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port: 53
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protocol: UDP
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- name: dns-tcp
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port: 53
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protocol: TCP
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- name: metrics
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port: 9153
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protocol: TCP
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EOF
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```
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## 启动
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```shell
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kubectl apply -f coredns.yaml
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```
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@ -0,0 +1,42 @@
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```sh
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# 查看所在pod
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[root@hy-node3 ~]# kubectl get pod -n kube-system
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NAME READY STATUS RESTARTS AGE
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calico-kube-controllers-7cc8dd57d9-jhvnj 1/1 Running 4 7d21h
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calico-node-lm24q 1/1 Running 9 20d
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calico-node-p2pn4 1/1 Running 5 20d
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coredns-675db8b7cc-s6z7g 1/1 Running 1 7d21h
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snapshot-controller-0 1/1 Running 0 7d6h
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# 找到对应service,使用serviceip
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[root@hy-node3 ~]# kubectl get svc -n kube-system
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NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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kube-controller-manager-svc ClusterIP None <none> 10257/TCP 13d
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kube-dns ClusterIP 10.96.0.2 <none> 53/UDP,53/TCP,9153/TCP 20d
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kube-scheduler-svc ClusterIP None <none> 10259/TCP 13d
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kubelet ClusterIP None <none> 10250/TCP,10255/TCP,4194/TCP 13d
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# 找个ip查看dns是否能够解析
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[root@hy-node3 ~]# kubectl get svc
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NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 21d
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nginx-service-nodeport NodePort 10.96.231.91 <none> 80:30001/TCP 20d
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# 解析测试
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dig -t a www.baidu.com @10.96.0.2
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[root@hy-node3 ~]# cat /etc/resolv.conf
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# Generated by NetworkManager
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nameserver 192.168.1.120
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nameserver 223.6.6.6
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nameserver 223.5.5.5
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# 编辑coredns配置文件
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kubectl edit configmap coredns -n kube-system
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```
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```sh
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# 查看是否可以滚动升级
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[root@hy-node3 ~]# kubectl get deployment.apps -n kube-system
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NAME READY UP-TO-DATE AVAILABLE AGE
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calico-kube-controllers 1/1 1 1 20d
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coredns 1/1 1 1 20d
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[root@hy-node3 ~]# kubectl rollout restart deployment coredns -n kube-system
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deployment.apps/coredns restarted
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```
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@ -0,0 +1,25 @@
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```sh
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yum -y install bind
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vi /etc/named.conf
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vi /etc/named.rfc1912.zones
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cd /var/named/
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ll
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cp -p named.localhost hy.com
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cp -p named.localhost hy.com.zone
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ll
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rm hy.com
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ll
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vivi
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vi hy.com.zone
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systemctl enbled named
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systemctl enable named
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systemctl restart named
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systemctl start named
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systemctl status named.service
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vi hy.com.zone
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vi /etc/named.rfc1912.zones
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vi hy.com.zone
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systemctl start named
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```
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@ -1,3 +1,4 @@
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kubectl explain service.spec.ports
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nodeport
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clusterid
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headlss
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