umount: /deploy: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1))
网上查找为有进程在使用磁盘，执行fuser -m -u /磁盘，查看使用磁盘的进程，找到pid，使用kill -9 杀掉进程，在使用umount卸载。