使用StatefulSet部署mysql

用Service去找StatefulSet，指定mysql初始密码，用hostPath与本地进行挂载
这里只同步了data，还应该同步log和my.cnf

apiVersion: v1
kind: Service
metadata:
  name: mysql57
  labels:
    app: mysql
spec:
  selector:
    app: mysql
  type: NodePort
  ports:
  - name: mysql57
    port: 3306
    nodePort: 30306
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mysql
spec:
  selector:
    matchLabels:
      app: mysql # has to match .spec.template.metadata.labels
  serviceName: mysql
  replicas: 1 # by default is 1
  template:
    metadata:
      labels:
        app: mysql # has to match .spec.selector.matchLabels
    spec:
      terminationGracePeriodSeconds: 10
      containers:
      - name: mysql
        image: mysql:5.7
        ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - name: host-path
          mountPath: /var/lib/mysql
        env:
          - name: MYSQL_ROOT_PASSWORD
            value: "1234"
      volumes:
        - name: host-path
          hostPath:
            path: /usr/local/mysql
            type: DirectoryOrCreate

需要知道pod在哪个节点上运行，创建相应的父文件夹
如果启动失败，可能是因为分配到的节点上的目录有问题