Kubernetes部署GuestBook

掌握要点

（1）安装redis集群

（2）定义service的Yaml文件

（3）创建service

什么是GuestBook

Guestbook它是留言板系统，利用Redis系统来实现消息的推送和接收，我们在本节学习部署Redis Server节点的部署。

1.安装Redis集群

⚫首先我们需要部署一个Redis的Master集群和。

⚫利用ReplicationController部署redis集群，作为Pod的控制器。

[root@node1 go]# cat redis-master.yaml 
apiVersion: v1
kind: ReplicationController 
metadata:
  labels:
    name: redis-master
  name: redis-master
spec:
  replicas: 1
  selector:
    name: redis-master
  template:
    metadata:
      labels:
        name: redis-master
    spec:
      containers:
      - image: kubeguide/redis-master
        name: redis-master
        ports:
        - containerPort: 6379
        
        
[root@node1 go]# cat redis-slave.yaml 
apiVersion: v1
kind: ReplicationController 
metadata:
  labels:
    name: redis-slave
  name: redis-slave
spec:
  replicas: 2 
  selector:
    name: redis-slave
  template:
    metadata:
      labels:
        name: redis-slave
    spec:
      containers:
      - image: kubeguide/guestbook-redis-slave
        name: slave
        ports:
        - containerPort: 6379
        env: 
        - name: GET_HOSTS_FROM 
          value: env 
         

2.检查当前状态

⚫运行两个RC的pod控制器yaml文件。

⚫检查当前的控制器副本。

[root@node1 go]# kubectl apply -f redis-master.yaml  
[root@node1 go]# kubectl apply -f redis-slave.yaml 

[root@node1 go]# kubectl get pods 
NAME                 READY   STATUS    RESTARTS   AGE
frontend-bxnq2       1/1     Running   0          10m
frontend-swhcx       1/1     Running   0          10m
redis-master-bjg8c   1/1     Running   0          16m
redis-slave-b94sm    1/1     Running   0          14m
redis-slave-j8n9v    1/1     Running   0          14m

3.暴露端口服务

⚫创建Service服务用于暴露端口。

⚫创建Serivice服务使用ClusterIP的模式，暴露Redis的6379端口。

[root@node1 go]# cat service-master.yaml 
apiVersion: v1
kind: Service
metadata:
  labels:
    name: redis-master
  name: redis-master
spec:
  ports:
  - name: redis 
    port: 6379
    targetPort: 6379
  selector:
    name: redis-master
  type: ClusterIP
  
  
[root@node1 go]# cat service-slave.yaml 
apiVersion: v1
kind: Service
metadata:
  labels:
    name: redis-slave 
  name: redis-slave 
spec:
  ports:
  - name: redis 
    port: 6379
    targetPort: 6379
  selector:
    name: redis-slave 
  type: ClusterIP

创建之后查看当前的service服务端口状态。

[root@node1 go]# kubectl apply -f service-master.yaml  
[root@node1 go]# kubectl apply -f service-slave.yaml 
[root@node1 go]# kubectl get svc 
NAME           TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
kubernetes     ClusterIP   10.96.0.1       <none>        443/TCP        29h
redis-master   ClusterIP   10.97.74.242    <none>        6379/TCP       18m
redis-slave    ClusterIP   10.110.38.75    <none>        6379/TCP       15m

4.部署Frontend页面

⚫安装Frontend集群

⚫关联service服务

⚫访问界面

⚫使用RC创建Pod控制器

[root@node1 go]# cat frontend.yaml 
apiVersion: v1
kind: ReplicationController 
metadata:
  labels:
    name: frontend 
  name: frontend 
spec:
  replicas: 2 
  selector:
    name: frontend 
  template:
    metadata:
      labels:
        name: frontend 
    spec:
      containers:
      - image: kubeguide/guestbook-php-frontend 
        name: slave
        ports:
        - containerPort: 80
        env: 
        - name: GET_HOSTS_FROM 
          value: env 
          
[root@node1 go]# kubectl apply -f frontend.yaml  
[root@node1 go]# kubectl get pods 
NAME                 READY   STATUS    RESTARTS   AGE
frontend-bxnq2       1/1     Running   0          15m
frontend-swhcx       1/1     Running   0          15m
redis-master-bjg8c   1/1     Running   0          21m
redis-slave-b94sm    1/1     Running   0          19m
redis-slave-j8n9v    1/1     Running   0          19m

5.对外暴露服务端口

⚫frontend Pod已创建且正常运行后，在创建与之关联的Service。

⚫上面的Redis集群使用的是ClusterIP的方式，这里使用NodePort的方式对外暴露。

[root@node1 go]# cat service-frontend.yaml  
apiVersion: v1
kind: Service
metadata:
  labels:
    name: frontend 
  name: frontend 
spec:
  ports:
  - name: 
    port: 80
    nodePort: 30003
  selector: 
    name: frontend 
  type: NodePort 
  
[root@node1 go]# kubectl get svc 
NAME           TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
frontend       NodePort    10.107.237.70   <none>        80:30003/TCP   14m
kubernetes     ClusterIP   10.96.0.1       <none>        443/TCP        30h
redis-master   ClusterIP   10.97.74.242    <none>        6379/TCP       22m
redis-slave    ClusterIP   10.110.38.75    <none>        6379/TCP       19m

6.访问页面

⚫通过http://192.168.1.15:30003访问。