来自官网教程

Kubernetes Documentation
Tutorials
Stateless Applications
Example: Deploying PHP Guestbook application with Redis

Example: Deploying PHP Guestbook application with Redis

1. 按照教程依次创建yaml文件并复制代码

   [root@centos7-188 guestbook]# ls

    frontend-deployment.yaml  frontend-service.yaml  redis-follower-deployment.yaml  redis-follower-service.yaml  redis-leader-deployment.yaml  redis-leader-service.yaml
   

2. 早先因为 image 总是被墙，所以，结果总是不对！
   前天终于找到了方法：使用阿里云容器镜像的 github关联仓库，海外机器构建 Docker 镜像

   自行创建了 2 个镜像如下，目前是 open 的
   registry.cn-beijing.aliyuncs.com/docker-dhbm/gb-frontend
   registry.cn-beijing.aliyuncs.com/docker-dhbm/gb-redis-follower

3. 修改用到这 2 个 image 的文件
   不会使用 sed 命令替换 image，只好 vim 手工替换
   哪位知道的话，告知一下，谢过！

   [root@centos7-188 guestbook]# vim redis-follower-deployment.yaml

    # SOURCE: https://cloud.google.com/kubernetes-engine/docs/tutorials/guestbook
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: redis-follower
      labels:
        app: redis
        role: follower
        tier: backend
    spec:
      replicas: 2
      selector:
        matchLabels:
          app: redis
      template:
        metadata:
          labels:
            app: redis
            role: follower
            tier: backend
        spec:
          containers:
          - name: follower
            image: registry.cn-beijing.aliyuncs.com/docker-dhbm/gb-redis-follower # gcr.io/google_samples/gb-redis-follower:v2
            resources:
              requests:
                cpu: 100m
                memory: 100Mi
            ports:
            - containerPort: 6379
            - 
   

   [root@centos7-188 guestbook]# vim frontend-deployment.yaml

    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: frontend
    spec:
      replicas: 3
      selector:
        matchLabels:
            app: guestbook
            tier: frontend
      template:
        metadata:
          labels:
            app: guestbook
            tier: frontend
        spec:
          containers:
          - name: php-redis
            image: registry.cn-beijing.aliyuncs.com/docker-dhbm/gb-frontend # gcr.io/google_samples/gb-frontend:v5
            env:
            - name: GET_HOSTS_FROM
              value: "dns"
            resources:
              requests:
                cpu: 100m
                memory: 100Mi
            ports:
            - containerPort: 80
            - 
   

4. 另外，为了后续测试验证，将其中 2 个 service 改用 LoadBalancer 方式

   如果不支持 LoadBalancer ，自行改成 NodePort，或者使用 port-forward

   [root@centos7-188 guestbook]# vim redis-leader-service.yaml

    # SOURCE: https://cloud.google.com/kubernetes-engine/docs/tutorials/guestbook
    apiVersion: v1
    kind: Service
    metadata:
      name: redis-leader
      labels:
        app: redis
        role: leader
        tier: backend
    spec:
      type: LoadBalancer
      ports:
      - port: 6379
        targetPort: 6379
      selector:
        app: redis
        role: leader
        tier: backend
   

   [root@centos7-188 guestbook]# vim frontend-service.yaml

    # SOURCE: https://cloud.google.com/kubernetes-engine/docs/tutorials/guestbook
    apiVersion: v1
    kind: Service
    metadata:
      name: frontend
      labels:
        app: guestbook
        tier: frontend
    spec:
      # if your cluster supports it, uncomment the following to automatically create
      # an external load-balanced IP for the frontend service.
      # type: LoadBalancer
      type: LoadBalancer
      ports:
        # the port that this service should serve on
      - port: 80
      selector:
        app: guestbook
        tier: frontend
   

5. 依次启动

   kubectl apply -f redis-leader-deployment.yaml
   kubectl apply -f redis-leader-service.yaml
   kubectl apply -f redis-follower-deployment.yaml
   kubectl apply -f redis-follower-service.yaml

   kubectl apply -f frontend-deployment.yaml
   kubectl apply -f frontend-service.yaml

6. 确认 pods 和 svc 状态

   [root@centos7-188 guestbook]# kubectl get pods -l app=guestbook -l tier=frontend

    NAME                        READY   STATUS    RESTARTS   AGE
    frontend-6cb8c45cd5-2r5xv   1/1     Running   0          57m
    frontend-6cb8c45cd5-bshtl   1/1     Running   0          57m
    frontend-6cb8c45cd5-kh767   1/1     Running   0          57m
   

   [root@centos7-188 guestbook]# kubectl get svc

    NAME             TYPE           CLUSTER-IP       EXTERNAL-IP     PORT(S)          AGE
    demo             ClusterIP      10.109.183.133   <none>          80/TCP           15d
    demo1            LoadBalancer   10.103.29.98     192.168.1.240   80:32057/TCP     29h
    frontend         LoadBalancer   10.96.43.138     192.168.1.243   80:30521/TCP     48m
    kubernetes       ClusterIP      10.96.0.1        <none>          443/TCP          15d
    redis-follower   ClusterIP      10.102.140.9     <none>          6379/TCP         57m
    redis-leader     LoadBalancer   10.104.163.223   192.168.1.244   6379:32365/TCP   29m
   

7. 验证 guestbook 前端

   [root@centos7-188 guestbook]# curl 192.168.1.243

   浏览器查看
   

8. 验证 redis 数据

   $ redis-cli -h 192.168.1.244

    192.168.1.244:6379> keys *
    1) "guestbook"
    
    192.168.1.244:6379> get guestbook
    ",aaa,2222,sss,dddd,ZZZZZ"
   

9，清理现场
kubectl delete deployment -l app=redis
kubectl delete service -l app=redis
kubectl delete deployment frontend
kubectl delete service frontend