跳到主要内容

pod-base-middleware

数据库和Redis改造Pod启动​
Redis容器改造Pod​

redis.yaml

apiVersion: v1
kind: Pod
metadata:
  name: redis
  namespace: luffy
  labels:
    app: redis
spec:
  # hostNetwork: true
  containers:
  - name: redis
    image: redis:3.2
    ports:
    - containerPort: 6379

思考：是否可以用hostNetwork

使用Service类型资源实现负载：

service-redis.yaml

apiVersion: v1
kind: Service
metadata:
  name: redis
  namespace: luffy
spec:
  ports:
  - port: 6379
    protocol: TCP
    targetPort: 6379
  selector:
    app: redis
  type: ClusterIP
Mysql容器改造Pod​

mysql.yaml

apiVersion: v1
kind: Pod
metadata:
  name: mysql
  namespace: luffy
  labels:
    app: mysql
spec:
  containers:
  - name: mysql
    image: mysql:5.7
    env:
    - name: MYSQL_DATABASE   #  指定数据库地址
      value: "eladmin"
    - name: MYSQL_ROOT_PASSWORD
      value: "luffyAdmin!"
    ports:
    - containerPort: 3306
    args:
    - --character-set-server=utf8mb4
    - --collation-server=utf8mb4_unicode_ci
    volumeMounts:
    - name: mysql-data
      mountPath: /var/lib/mysql
  volumes: 
  - name: mysql-data
    hostPath: 
      path: /opt/mysql/data

思考：服务部署节点不固定，如何保障数据持久化

  • 定点部署

    # 给Pod添加节点选择器
      nodeSelector:   # 使用节点选择器将Pod调度到指定label的节点
        mysql: "true"

    # 给节点打标签
    kubectl label node k8s-master mysql=true

    # 停掉之前的mysql容器，用Pod部署
    docker stop mysql
    kubectl create -f mysql.yaml

    cat mysql.service.yaml
    apiVersion: v1
    kind: Service
    metadata:
      name: mysql
      namespace: luffy
    spec:
      ports:
      - port: 3306
        protocol: TCP
        targetPort: 3306
      selector:
        app: mysql
      type: ClusterIP
      

    # 创建mysql的service
    kubectl create -f mysql.service.yaml

    # 修改eladmin-api的环境变量，重建eladmin-api服务

  • 使用PV+PVC连接分布式存储解决方案

    • ceph
    • glusterfs
    • nfs