在k8s上运行实例Guestbook

解决拉取不到谷歌k8s.gcr.io仓库镜像的问题

  之前，已经搭建好k8s集群，为方便使用在ali CES服务器搭建了k8s solo.此次，在
k8s上运行实例Guestbook.

创建rc&service文件

redis-master-controller.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: redis-master
  labels:
    name: redis-master
spec:
  replicas: 1
  selector:
    name: redis-master
  template:
    metadata:
      labels:
        name: redis-master
  spec:
    containers:
    - name: master
        image: kubeguide/redis-master
        ports:
        - containerPort: 6379

redis-master-service.yaml

apiVersion: v1
kind: Service
metadata:
 name: redis-master
 labels:
   name: redis-master
spec:
  ports:
  - port: 6379
    targetPort: 6379
  selector:
    name: redis-master

redis-slave-controller.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: redis-slave
spec:
  replicas: 2
  selector:
    name: redis-slave
  template:
    metadata:
      name: redis-slave
      labels:
        name: redis-slave
    spec:
      containers:
     - name: redis-slave
       image: kubeguide/guestbook-redis-slave
       env:
     - name: GET_HOSTS_FROM
       value: env
     ports:
     - containerPort: 6379

redis-slave-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: redis-slave
  labels:
    name: redis-slave
spec:
  ports:
  - port: 6379
  selector: 
    name: redis-slave

frontend-controller.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: frontend
  labels:
    name: frontend
spec:
  replicas: 3
  selector:
    name: frontend
  template:
    metadata:
      labels:
        name: frontend
    spec:
      containers:
      - name: frontend
        image: kubeguide/guestbook-php-frontend
        env:
        - name: GET_HOSTS_FROM
          value: env
        ports:
        - containerPort: 80

frontend-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: frontend
  labels:
    name: frontend
spec:
  type: NodePort
  ports:
  - port: 80
    nodePort: 30001
  selector:
    name: frontend

创建、删除rc&service


#创建rc&service

kubectl create -f redis-master-controller.yaml
kubectl create -f redis-master-service.yaml
kubectl create -f redis-slave-controller.yaml
kubectl create -f redis-slave-service.yaml
kubectl create -f frontend-controller.yaml
kubectl create -f frontend-service.yaml


#删除rc&service

kubectl delete -f redis-slave-controller.yaml 
kubectl delete -f redis-slave-service.yaml 
kubectl delete -f redis-master-controller.yaml 
kubectl delete -f redis-master-service.yaml 
kubectl delete -f frontend-controller.yaml 
kubectl delete -f frontend-service.yaml 

#或者

kubectl delete rc --all
kubectl delete service --all

查看rs&service

root@liu:~/demo# kubectl get rc
NAME           DESIRED   CURRENT   READY     AGE
frontend       3         3         3         4h
redis-master   1         1         1         5h
redis-slave    2         2         2         4h

root@liu:~/demo# kubectl get service
NAME           TYPE        CLUSTER-IP        EXTERNAL-IP   PORT(S)        AGE
frontend       NodePort    169.169.10.4      <none>        80:30001/TCP   4h
kubernetes     ClusterIP   169.169.0.1       <none>        443/TCP        5h
redis-master   ClusterIP   169.169.224.109   <none>        6379/TCP       4h
redis-slave    ClusterIP   169.169.38.248    <none>        6379/TCP       4h

查看pod

root@liu:~# kubectl get pods
NAME                 READY     STATUS              RESTARTS   AGE
frontend-5n2p2       0/1       ContainerCreating   0          31s
frontend-hrxbc       0/1       ContainerCreating   0          31s
frontend-l67mj       0/1       ContainerCreating   0          31s
redis-master-dnck9   0/1       ContainerCreating   0          31s
redis-slave-4sw5p    0/1       ContainerCreating   0          31s
redis-slave-sc6bd    0/1       ContainerCreating   0          31s

Q:拉取不到k8s.gcr.io/pause，pod一直处于创建状态

  创建好rc,查看pod,发现pod处于创建状态，查看日志发现没有配置clusterDNS,  
启动了default配置，但是要下载pause:3.1镜像.由于GFW,拉取不到pause:3.1.  
更烦的是，无论采用代理还是阿里云容器加速，都拉取不到该镜像.

查看pod日志
```
kubectl describe pod redis-master
```

A:拉取别人克隆的镜像，并要修改成谷歌镜像的容器名


#这是国内，别人建的仓库

docker pull anjia0532/pause:3.1

#k8s监测镜像k8s.gcr.io/pause:3.1，不存在会拉取


#修改后，查看pod状态，逐渐变为running

docker docker tag da86e6ba6ca1 k8s.gcr.io/pause:3.1

running
done

测试用例

  由于实例在阿里云上，要添加安全组，才能从外部网访问，这里分析GuestBook,  
通过curl的方式实现与服务的交互.

Guestbook页面的处理逻辑

  redis中的存储着一个key-value,key=massages,value=留言1,留言2,  
访问页面，查redis key=massages,得到value以","分隔的留言串.控制器  
分割字符串，得到一个个留言，显示到页面
  在页面上填写留言，并提交.控制器，将留言追加到留言串上，写入redis.
并得到"updated"响应.

Guestbook页面

curl方式留言


#获取留言信息

root@liu:~/demo# curl "127.0.0.1:30001/guestbook.php?cmd=get&key=messages"
{"data": "hello,hi"}


#填写留言

root@liu:~/demo# curl "127.0.0.1:30001/guestbook.php?cmd=set&key=messages&value=hello,hi,test"
{"message": "Updated"}


#更新后的留言

root@liu:~/demo# curl "127.0.0.1:30001/guestbook.php?cmd=get&key=messages"
{"data": "hello,hi,test"}

在k8s上运行实例Guestbook

在k8s上运行实例Guestbook

解决拉取不到谷歌k8s.gcr.io仓库镜像的问题

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