https://blog.51cto.com/misliang/1610670
https://zhuanlan.zhihu.com/p/47926853
https://www.joe0.com/2015/11/14/how-to-create-a-bare-metal-iso-image-backup-of-a-liverunning-linux-server-centos-7-instructions/
https://blog.51cto.com/misliang/1610670
https://zhuanlan.zhihu.com/p/47926853
https://www.joe0.com/2015/11/14/how-to-create-a-bare-metal-iso-image-backup-of-a-liverunning-linux-server-centos-7-instructions/