Create custom GRUB2 menu entries. #grub #grub2 #linux

README-custom-grub2-menu.md

The auto-generated (during OS installation) menu entries are placed at /boot/grub/grub.cfg. These entries can be used as a starting point for creating new menu entries. Roughly, the process is as follows:

Edit /etc/grub.d/40_custom and provide your menu entries. For example, say we want to provide an alternative way to initialize our debian system via systemd:

#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.

menuentry 'Debian GNU/Linux, with Linux 3.2.0-4-amd64 (systemd)' {
	load_video
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(/dev/sda,msdos1)'
	search --no-floppy --fs-uuid --set=root b1ef2365-c1c9-4887-8f1e-2a7334b7d8cd
	echo	'Loading Linux 3.2.0-4-amd64 ...'
	linux	/boot/vmlinuz-3.2.0-4-amd64 root=UUID=b1ef2365-c1c9-4887-8f1e-2a7334b7d8cd ro init=/bin/systemd
	echo	'Loading initial ramdisk ...'
	initrd	/boot/initrd.img-3.2.0-4-amd64
}

Now, we must update (re-generate) our /boot/grub/grub.cfg file:

update-grub

Install grub to target device (usually the MBR of our 1st disk), say /dev/sda:

grub-install /dev/sda

Reboot!

Find more detailed info at https://help.ubuntu.com/community/Grub2/CustomMenus

Is it possible to reuse default config and add some params instead of writing everything manually?