（六）kubernetes部署应用service方式

前几章验证的是部署以及内部访问，但是事实上很多情况都需使用外部访问，比如部署nacos，数据库等等。我是在搭建prometheus监控时候遇到无法访问，固想起还有外部访问方式，今天就验证一下外部可访问的部署方式service。

service是k8s中的一个重要概念，主要是提供负载均衡和服务自动发现

因为Pod IP会随着Pod的重建产生变化，可以使用Service提供的ip

1：编辑yaml文件

[root@master00 md-order]# vim md-order-03.yaml


apiVersion: apps/v1                  # K8S对应的API版本
kind: Deployment                                # 对应的类型
metadata:
  name: caoqing-deployment-test
  #labels:
   # name: cqoqing-deployment-test01
spec:
  selector:
    matchLabels:
      app: caoqing-deployment-test
  replicas: 2                                   # 镜像副本数量
  template:
    metadata:
      labels:                                   # 容器的标签 可和service关联
        app: caoqing-deployment-test
    spec:
      containers:
        - name: md-order9006                          # 容器名和镜像
          image: registry.cn-beijing.aliyuncs.com/fastdfcsx/md-order-test:2022-10-xx-xx-33-54
          imagePullPolicy: Always
          ports:
          - name: md-order9006
            containerPort: 9006
            protocol: TCP

 2：创建pod

[root@master00 md-order]# kubectl create -f md-order-03.yaml 
deployment.apps/caoqing-deployment-test created
[root@master00 md-order]# 
[root@master00 md-order]# 
[root@master00 md-order]# kubectl get pods -o wide
NAME                                       READY   STATUS    RESTARTS   AGE   IP               NODE       NOMINATED NODE   READINESS GATES
caoqing-deployment-test-689bbd9587-67f7n   1/1     Running   0          7s    10.111.112.135   master01              
caoqing-deployment-test-689bbd9587-cthlp   1/1     Running   0          7s    10.100.59.203    master02              

 3：创建service

[root@master00 md-order]# kubectl expose deploy caoqing-deployment-test --name=cq-service01 --type=ClusterIP --target-port=9006
service/cq-service01 exposed
[root@master00 md-order]# 
[root@master00 md-order]# 
[root@master00 md-order]# kubectl get service
NAME           TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
cq-service01   ClusterIP   10.101.187.154           9006/TCP   13s
kubernetes     ClusterIP   10.96.0.1                443/TCP    33d
[root@master00 md-order]# 
[root@master00 md-order]# 
[root@master00 md-order]# kubectl get service -o wide
NAME           TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE   SELECTOR
cq-service01   ClusterIP   10.101.187.154           9006/TCP   35s   app=caoqing-deployment-test
kubernetes     ClusterIP   10.96.0.1                443/TCP    33d   

4：以上方式无法外部访问，我们可以外部访问方式 创建，讲type改为nodeport

[root@master00 md-order]# kubectl expose deploy caoqing-deployment-test --name=cq-service02 --type=NodePort --target-port=9006
service/cq-service02 exposed
[root@master00 md-order]# 

 4：查看该service详细内容，默认暴露31183端口

[root@master00 md-order]# kubectl get pods,service
NAME                                           READY   STATUS    RESTARTS   AGE
pod/caoqing-deployment-test-689bbd9587-blrcn   1/1     Running   0          4m36s
pod/caoqing-deployment-test-689bbd9587-wwc77   1/1     Running   0          4m36s

NAME                   TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
service/cq-service01   ClusterIP   10.101.187.154           9006/TCP         2m27s
service/cq-service02   NodePort    10.107.171.238           9006:31183/TCP   26s
service/kubernetes     ClusterIP   10.96.0.1                443/TCP          33d

 5：验证端口是否可以访问

[root@master00 md-order]# curl 192.168.0.250:31183/doc.html   #拉取镜像开发swagger，可以直接访问，ip地址可以是集群内的任意一个ip

 

参考学习大神文章：链接