Kubernetes----NodePort类型的Service

Kubernetes----NodePort类型的Service

一、NodePort类型的Service简介

ClusterIP类型和Headless类型的Service都只能在集群环境内部访问，如果想开放给集群环境以外访问，那就需要使用NodePort类型，NodePort的工作原理其实就是将service的端口映射到Node的端口上，然后通过NodeIP:NodePort 来访问Service

二、环境准备

编写deployment.yaml文件，内容如下：

apiVersion: v1kind: Namespacemetadata: name: dev---apiVersion: apps/v1kind: Deploymentmetadata: name: pc-deployment namespace: devspec: replicas: 3 selector: matchLabels: app: nginx-pod template: metadata: labels: app: nginx-pod spec: containers: - name: nginx image: nginx:1.17.1 ports: - containerPort: 80

然后使用如下命令创建资源

[root@master service]# kubectl apply -f deployment.yamlnamespace/dev createddeployment.apps/pc-deployment created[root@master service]#

查看创建的资源如下：

[root@master service]# kubectl get deploy,pod -n dev -o wideNAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTORdeployment.apps/pc-deployment 3/3 3 3 17m nginx nginx:1.17.1 app=nginx-podNAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATESpod/pc-deployment-5ffc5bf56c-mqwst 1/1 Running 0 17m 10.244.2.191 node2 pod/pc-deployment-5ffc5bf56c-qbznm 1/1 Running 0 17m 10.244.1.53 node1 pod/pc-deployment-5ffc5bf56c-zxnsx 1/1 Running 0 17m 10.244.2.190 node2 [root@master service]#

三、创建NodePort类型Service

编辑nodeport.yaml文件，内容如下：

apiVersion: v1kind: Servicemetadata: name: service-nodeport namespace: devspec: selector: app: nginx-pod type: NodePort ports: - port: 80 nodePort: 30002 targetPort: 80

使用如下命令创建服务

[root@master service]# kubectl apply -f nodeport.yamlservice/service-nodeport created[root@master service]#

查看所创建的资源如下：

[root@master service]# kubectl get service,deployment,pod -n devNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGEservice/service-nodeport NodePort 10.107.215.143 80:30002/TCP 10mNAME READY UP-TO-DATE AVAILABLE AGEdeployment.apps/pc-deployment 3/3 3 3 23hNAME READY STATUS RESTARTS AGEpod/pc-deployment-5ffc5bf56c-mqwst 1/1 Running 0 23hpod/pc-deployment-5ffc5bf56c-qbznm 1/1 Running 0 23hpod/pc-deployment-5ffc5bf56c-zxnsx 1/1 Running 0 23h[root@master service]#

此时可以在集群环境之外，通过节点ip：port访问服务，如这里节点ip为192.168.16.40，端口为30002，如下：

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