PXE：偷梁换柱，成功 启动 centos live

default menu.c32
timeout 1


### 偷梁换柱，成功
label centos76-live
menu label centos76-live from ftp
kernel fedora29live/isolinux/vmlinuz
append initrd=fedora29live/isolinux/initrd.img root=live:ftp://192.168.143.1/centos76live/LiveOS/squashfs.img rd.live.image