k8s部署自己的web平台

1. 制作mariadb镜像，在Dockerfile中初始化数据库，源码：

https://github.com/zhanggq/mariadb

2. 制作自己的web镜像，后端用go编写，前端用的amaze，开放端口8082，源码暂不提供

3. Dashboard上点创建，粘贴yaml，启动mariadb rc

apiVersion: v1
kind: ReplicationController
metadata:
  name: mysql
spec:
  replicas: 1
  selector:
    app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
        containers:
        - image: registry.cn-hangzhou.aliyuncs.com/zhanggq/mariadb:v10.1
          name: mysql
          resources:
            limits:
              cpu: "2"
              memory: 2Gi
          ports:
          - containerPort: 3306
          env:
          - name: MYSQL_ROOT_PASSWORD
            value: "123456"

4. 启动mariadb svc

apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  ports:
  - name: mysql-svc
    port: 3306
    targetPort: 3306
    nodePort: 31101
  selector:
    app: mysql
  type: NodePort

5. 启动amaze rc

apiVersion: v1
kind: ReplicationController
metadata:
  name: amaze
spec:
  replicas: 1
  selector:
    app: amaze
  template:
    metadata:
      labels:
        app: amaze
    spec:
        containers:
        - image: registry.cn-hangzhou.aliyuncs.com/zhanggq/amaze:v1.0
          name: amaze
          resources:
            limits:
              cpu: "1"
              memory: 1Gi
          ports:
          - containerPort: 8082

6. 启动amaze svc

apiVersion: v1
kind: Service
metadata:
  name: amaze
spec:
  ports:
  - name: amaze-svc
    port: 8082
    targetPort: 8082
    nodePort: 30082
  selector:
    app: amaze
  type: NodePort

遇到的问题

1. docker启动容器报错：

docker: Error response from daemon: mkdir /var/lib/docker/overlay/64d4cbac6ef69d5b84fc753e83dc2849f14e43177d0e9d
a532eb61499ce7e2fc-init/merged/dev/shm: invalid argument.

解决办法：升级内核

原内核Kernel Version: 3.10.0-229.el7.x86_64

升级后内核4.6.0-1.el7.elrepo.x86_64

2. 手工改了一下web应用里面的配置，远程连接mysql数据库10.233.104.69:3306

后来发现其实是没搞清楚Kubernetes中Service的概念。具体的分析在下文介绍。