标签：pig 解决方案 sch timeout toc local uber 报错 OLE
部署官网：https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns/coredns
为服务提供名称域名的访问。
- DNS服务监视Kubernetes API，为每一个Service创建DNS记录用于域名解析。
- ClusterIP A记录格式：<service-name>.<namespace-name>.svc.cluster.local
示例：my-svc.my-namespace.svc.cluster.local
1、创建dns Yaml配置文件
apiVersion: v1 kind: ServiceAccount metadata: name: coredns namespace: kube-system labels: kubernetes.io/cluster-service: "true" addonmanager.kubernetes.io/mode: Reconcile --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: labels: kubernetes.io/bootstrapping: rbac-defaults addonmanager.kubernetes.io/mode: Reconcile name: system:coredns rules: - apiGroups: - "" resources: - endpoints - services - pods - namespaces verbs: - list - watch - apiGroups: - "" resources: - nodes verbs: - get --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: annotations: rbac.authorization.kubernetes.io/autoupdate: "true" labels: kubernetes.io/bootstrapping: rbac-defaults addonmanager.kubernetes.io/mode: EnsureExists 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 labels: addonmanager.kubernetes.io/mode: EnsureExists data: Corefile: | .:53 { errors health # 更改dns域 kubernetes cluster.local in-addr.arpa ip6.arpa { pods insecure upstream } cache 30 loop reload loadbalance } --- apiVersion: apps/v1 kind: Deployment metadata: name: coredns namespace: kube-system labels: k8s-app: kube-dns kubernetes.io/cluster-service: "true" addonmanager.kubernetes.io/mode: Reconcile kubernetes.io/name: "CoreDNS" spec: # replicas: not specified here: # 2. Default is 1. strategy: type: RollingUpdate rollingUpdate: maxUnavailable: 1 selector: matchLabels: k8s-app: kube-dns template: metadata: labels: k8s-app: kube-dns annotations: seccomp.security.alpha.kubernetes.io/pod: ‘docker/default‘ spec: priorityClassName: system-cluster-critical serviceAccountName: coredns tolerations: - key: "CriticalAddonsOnly" operator: "Exists" nodeSelector: beta.kubernetes.io/os: linux containers: - name: coredns # 更改DNS地址 image: coredns/coredns:1.2.6 imagePullPolicy: IfNotPresent resources: limits: # 内存自定义 memory: 170Mi requests: cpu: 100m memory: 70Mi args: [ "-conf", "/etc/coredns/Corefile" ] volumeMounts: - name: config-volume mountPath: /etc/coredns readOnly: true ports: - containerPort: 53 name: dns protocol: UDP - containerPort: 53 name: dns-tcp protocol: TCP - containerPort: 9153 name: metrics protocol: TCP livenessProbe: httpGet: path: /health port: 8080 scheme: HTTP initialDelaySeconds: 60 timeoutSeconds: 5 successThreshold: 1 failureThreshold: 5 readinessProbe: httpGet: path: /health port: 8080 scheme: HTTP securityContext: allowPrivilegeEscalation: false capabilities: add: - NET_BIND_SERVICE drop: - all readOnlyRootFilesystem: true dnsPolicy: Default volumes: - name: config-volume configMap: name: coredns items: - key: Corefile path: Corefile --- 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" addonmanager.kubernetes.io/mode: Reconcile kubernetes.io/name: "CoreDNS" spec: selector: k8s-app: kube-dns # 更改为kube配置的DNS地址 clusterIP: 10.0.0.2 ports: - name: dns port: 53 protocol: UDP - name: dns-tcp port: 53 protocol: TCP - name: metrics port: 9153 protocol: TCP
2、执行命令创建dns
kubectl apply -f coredns.yaml
3、查看pod状态
NAME READY STATUS RESTARTS AGE
coredns-6765c879f8-lwtwt 1/1 Running 0 25s
4、测试dns是否正常
4.1 启用一个临时容器
kubectl run -it --image=busybox:1.28.4 --rm --restart=Never sh
4.2 进入容器并进行解析
/ # nslookup kubernetes / # nslookup kubernetes Server: 10.0.0.2 Address 1: 10.0.0.2 kube-dns.kube-system.svc.cluster.local
4.3 创建另一个容器测试
kubectl run -it --image=busybox:1.28.4 --rm --restart=Never sh -n kube-system / # nslookup my-service.default Server: 10.0.0.2 Address 1: 10.0.0.2 kube-dns.kube-system.svc.cluster.local Name: my-service.default Address 1: 10.0.0.123 my-service.default.svc.cluster.local
查看已有解析service
kubectl get ep NAME ENDPOINTS AGE kubernetes 192.168.1.108:6443,192.168.1.109:6443 3d my-service <none> 7h54m nginx-service 172.17.1.2:80,172.17.1.3:80,172.17.1.6:80 2d4h nginx-service2 <none> 25h
# 注意事项
注：在api的service证书签发内留下dns的ip地址
# 报错：Failed to list *v1.Namespace: Get https://10.0.0.1:443/api/v1/namespaces?limit=500&resourceVersion=0: dial tcp 10.0.0.1:443: i/o timeout
解决方案：重启Node上的kube-proxy、重新创建coredns。
标签：pig 解决方案 sch timeout toc local uber 报错 OLE
原文地址：https://www.cnblogs.com/xiangsikai/p/11413970.html
