一、emptydir

删除pod，数据丢失，pod启动，数据持久。

kubecrl delete -f         :这个数据会丢失

docker rm -f               ：这个数据不会丢失

适合存储日志

   spec:

      nodeName: 10.0.0.13

      volumes:

      - name: mysql

        emptyDir: {}

      containers:

        - name: wp-mysql

          image: 10.0.0.11:5000/mysql:5.7

          imagePullPolicy: IfNotPresent

          ports:

          - containerPort: 3306

          volumeMounts:

          - mountPath: /var/lib/mysql

            name: mysql

 二、HostPath

适合做web服务的数据共享

nodeName: 10.0.0.13 ,但是需要通过nadeName来固定主机，不让pod飘来飘去。如果不设置nadeName还是实现不了数据持久化

   spec:

      nodeName: 10.0.0.12

      volumes:

      - name: mysql

        hostPath:

          path: /data/wp_mysql

                 nodeName: 10.0.0.13

      containers:

        - name: wp-mysql

          image: 10.0.0.11:5000/mysql:5.7

          imagePullPolicy: IfNotPresent

          ports:

          - containerPort: 3306

          volumeMounts:

          - mountPath: /var/lib/mysql

            name: mysql

nfs

      volumes:

      - name: mysql

        nfs:

          path: /data/wp_mysql

          server: 10.0.0.11

 

查看yaml文件的意思

[root@k8s-master vloume]# kubectl explain pv.spec.persistentVolumeReclaimPolicy
FIELD: persistentVolumeReclaimPolicy <string>

DESCRIPTION:
     What happens to a persistent volume when released from its claim. Valid
     options are Retain (default) and Recycle. Recycling must be supported by the
     volume plugin underlying this persistent volume. More info:
     http://kubernetes.io/docs/user-guide/persistent-volumes#recycling-policy