k8s dns 服务安装配置说明

1. 提前条件

    安装k8s 集群

 

2.  dns  安装配置

 

     安装方式: 使用controller  service 

    controller  脚本：

       基于官方改动

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apiVersion: v1 kind: ReplicationController metadata:   name: kube-dns-v8   namespace: kube-system   labels:     k8s-app: kube-dns     version: v8     kubernetes.io/cluster-service: "true" spec:   replicas: 1   selector:     k8s-app: kube-dns     version: v8   template:     metadata:       labels:         k8s-app: kube-dns         version: v8         kubernetes.io/cluster-service: "true"     spec:       containers:       - name: etcd         image: tlitiwwhtmi/etcd         resources:           limits:             cpu: 100m             memory: 50Mi         command:         - /usr/local/bin/etcd         - -data-dir         - /var/etcd/data         - -listen-client-urls         - http://127.0.0.1:2379,http://127.0.0.1:4001         - -advertise-client-urls         - http://127.0.0.1:2379,http://127.0.0.1:4001         - -initial-cluster-token         - skydns-etcd         volumeMounts:         - name: etcd-storage           mountPath: /var/etcd/data       - name: kube2sky         image: outrider/kube2sky         resources:           limits:             cpu: 100m             memory: 50Mi         args:         # command = "/kube2sky"         - --domain=cluster.local         - --kube_master_url=http://10.25.143.50:8080       - name: skydns         image: outrider/skydns         resources:           limits:             cpu: 100m             memory: 50Mi         args:         # command = "/skydns"         - -machines=http://localhost:4001         - -addr=0.0.0.0:53         - -domain=cluster.local         ports:         - containerPort: 53           name: dns           protocol: UDP         - containerPort: 53           name: dns-tcp           protocol: TCP         livenessProbe:           httpGet:             path: /healthz             port: 8080             scheme: HTTP           initialDelaySeconds: 30           timeoutSeconds: 5       - name: healthz         image: outrider/exechealthz         resources:           limits:             cpu: 10m             memory: 20Mi         args:         - -cmd=nslookup kubernetes.default.svc.cluster.local localhost >/dev/null         - -port=8080         ports:         - containerPort: 8080           protocol: TCP       volumes:       - name: etcd-storage         emptyDir: {}       dnsPolicy: Default  # Don't use cluster DNS.

　　

     service

  

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apiVersion: v1 kind: Service metadata:   name: kube-dns   namespace: kube-system   labels:     k8s-app: kube-dns     kubernetes.io/cluster-service: "true"     kubernetes.io/name: "KubeDNS" spec:   selector:     k8s-app: kube-dns   clusterIP: 10.254.0.3   ports:   - name: dns     port: 53     protocol: UDP   - name: dns-tcp     port: 53     protocol: TCP

　　创建namespace 

    

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apiVersion: v1 kind: Namespace metadata:   name: kube-system

　　

 

3. node  进行 dns 配置

  在启动脚本添加：

    

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1 2	--cluster-dns=10.254.0.3 \ --cluster-domain=cluster.local

　　

4. 重启node

  

5. 测试pod

   

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apiVersion: v1 kind: Pod metadata:   name: busybox   namespace: default spec:   containers:   - image: busybox     command:       - sleep       - "3600"     imagePullPolicy: IfNotPresent     name: busybox   restartPolicy: Always

　　

6. 测试

  

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1	kubectl  exec busybox -- nslookup ngservice

　测试结果

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Server:    10.254.0.3 Address 1: 10.254.0.3   Name:      ngservice Address 1: 10.254.52.109