1.创建一个挂载目录(/storage/$VEID)
ploop init -s 10G -t ext4  -f ploop1 -v 2 /storage/19484/additional_disk_image

2.关闭将要挂载磁盘的VPS
vzctl stop $VEID

3.创建钩子脚本（将创建一个/mnt 分区）
/etc/vz/conf/$VEID.mount

#!/bin/bash
ploop mount -m /vz/root/$VEID/mnt  /storage/$VEID/DiskDescriptor.xml

4.创建钩子脚本(启动openvz虚拟机时会先执行 umount,再执行mount)
/etc/vz/conf/$VEID.umount
#!/bin/bash
ploop umount /storage/$VEID/DiskDescriptor.xml
#一定要保留exit
exit 0

5.启动openvz主机
vzctl start $VEID