Showing posts with label CentOS. Show all posts
Showing posts with label CentOS. Show all posts

2014-03-17

GRUB2 multiboot ISO


GRUB2 multiboot ISO 2018 update

USB:
/boot/grub
/boot/iso
/boot/image
/boot/tc4
/boot/tc5
/boot/syslinux

get USB UUID & Label:
> blkid



/boot/grub.sh


/boot/grub/grub.env (1024byte)


/boot/grub/grub.cfg




/boo/grub/grub_hd.cfg (Harddisk)


/boo/grub/grub_fd.cfg (Floppy)



/boo/grub/grub_pe.cfg (Windows PE)

Linux:

/boo/grub/grub_tci.cfg (Tiny Core Linux)

/boo/grub/grub_sl.cfg (Slax)

/boo/grub/grub_u.cfg (Ubuntu)


/boo/grub/grub_d.cfg (Debian)


/boo/grub/grub_cd.cfg (CDLinux)


/boo/grub/grub_cr.cfg (ChromeOS)


/boo/grub/grub_s.cfg (openSUSE)


/boo/grub/grub_ce.cfg (CentOS)
* rdshell
method 1:
set rootopt="root=live:LABEL=CentOS-${ver}-${bit}-${live}"

boot into rdshell

1a: boot from RAM
# mkdir 1 2
# mount /dev/<usb partition> 1
# cp 1/boot/iso/<Centos ISO> 2
# umount 1
  (remove USB)
# exit

1b: boot from USB
# mkdir 1 2
# mount /dev/<usb partition> 1
# mount -o loop 1/boot/iso/<Centos ISO> 2
# exit

method 2:
set rootopt="root=live:${ISO_Path}/${iso}"

boot into rdshell

2a: boot from RAM
# mkdir -p boot/iso 1
# mount /dev/<usb partition> 1
# cp 1/boot/iso/<Centos ISO> boot/iso
# /init

2b: boot from USB
# mkdir -p boot 1
# mount /dev/<usb partition> 1
# ln -s /1/boot/iso /boot
# /init