一、service案例
vim svc-deploy.yaml ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ apiVersion: apps/v1 #首选extensions/v1beta1 kind: Deployment metadata: name: svc-deployment namespace: default spec: replicas: 3 selector: matchLabels: app: svc-deployment release: stable template: #以下为嵌套pod的字段; metadata: labels: app: svc-deployment release: stable env: test spec: containers: - name: svc-deployment image: hub.atguigu.com/library/nginx:latest ports: - name: http containerPort: 80 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim svc.yaml ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ apiVersion: v1 #首选extensions/v1beta1 kind: Service metadata: name: svc-deployment namespace: default spec: type: ClusterIP selector: app: svc-deployment release: stable ports: - name: http port: 80 targetPort: 80 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kubectl apply -f svc-deploy.yaml kubectl apply -f svc.yaml kubectl get svc;kubectl get deployment;kubectl get rs;kubectl get pod #查看创建资源; ipvsadm -ln;curl 10.109.120.103 #查看转发路径;测试:能访问服务; kubectl delete -f svc.yaml #删除svc资源;因此yaml文件尽量保留,以便后期维护。 sed -i "s/app: svc-deployment/app: svc-deployment1/g" svc.yaml #修改svc模板; kubectl apply -f svc.yaml;kubectl get svc curl 10.105.124.206 #再测试,不能访问服务;其原因svc的label于pod的label不一致。 ipvsadm -ln #查看svc转发策略:无。 sed -i "s/app: svc-deployment1/app: svc-deployment/g" svc.yaml kubectl apply -f svc.yaml;kubectl get svc curl 10.105.124.206 #测试:能访问服务; vim svc-headless.yaml ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ apiVersion: v1 #首选extensions/v1beta1 kind: Service metadata: name: svc-deployment-headless namespace: default spec: clusterIP: "None" selector: app: svc-deployment release: stable ports: - name: http port: 80 targetPort: 80 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kubectl apply -f svc-headless.yaml kubectl get svc;kubectl get pod -n kube-system yum -y install bind-utils dig -t A svc-deployment-headless.default.svc.cluster.local. @10.244.0.24 #对域名进行A记录解析。svc创建后,会将“svc的名称.名称空间.集群域名.@coreDNS的IP地址”写入coreDNS中。我们可通过dig命令解析该SVC域名为IP。???如何查询集群域名??? vim svc-nodePort.yaml ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ apiVersion: v1 kind: Service metadata: name: svc-deployment namespace: default spec: type: NodePort selector: app: svc-deployment release: stable ports: - name: http port: 80 targetPort: 80 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kubectl apply -f svc-nodePort.yaml kubectl get svc #查看svc的IP及端口; iptables -t nat -nvL vim svc-externalName.yaml ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ apiVersion: v1 kind: Service metadata: name: svc-deployment-1 namespace: default spec: type: ExternalName externalName: hub.atguigu.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kubectl apply -f svc-externalName.yaml kubectl get svc dig -t A svc-deployment-1.default.svc.cluster.local. @10.244.0.24