How to set Grub to automatically load Xen kernel
- by Cerin
How do you configure Grub to automatically use the Xen kernel under Ubuntu 11.10?
No matter what I do, it loads the first menuentry. The only way I can get it to load Xen is to manually select the kernel, which I can't do if I have to reboot the server remotely, or there's a power failure and the machine automatically boots up when power's restored, etc. It's driving me nuts.
In my /boot/grub/grub.cfg, the Xen kernel is at index 4 (i.e. it's the 5th menuentry). So I've tried:
Setting GRUB_DEFAULT=4, and running sudo update-grub
Setting GRUB_DEFAULT=saved and GRUB_SAVEDEFAULT=true, and running sudo update-grub
Setting GRUB_DEFAULT="Ubuntu GNU/Linux, with Xen 4.1-amd64 and Linux 3.0.0-16-server", and running sudo update-grub
None of these work. It continues to load the first menuentry, which is "Ubuntu, with Linux 3.0.0-16-server".
Below is my current /boot/grub/grub.cfg. What am I doing wrong?
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
set default="Ubuntu GNU/Linux, with Xen 4.1-amd64 and Linux 3.0.0-16-server"
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}
function load_video {
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
}
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=auto
load_video
insmod gfxterm
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
set locale_dir=($root)/boot/grub/locale
set lang=en_US
insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ]; then
set timeout=-1
else
set timeout=2
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
if background_color 44,0,30; then
clear
fi
### END /etc/grub.d/05_debian_theme ###
### BEGIN /etc/grub.d/10_linux ###
if [ ${recordfail} != 1 ]; then
if [ -e ${prefix}/gfxblacklist.txt ]; then
if hwmatch ${prefix}/gfxblacklist.txt 3; then
if [ ${match} = 0 ]; then
set linux_gfx_mode=keep
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=keep
fi
else
set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
menuentry 'Ubuntu, with Linux 3.0.0-16-server' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
set gfxpayload=$linux_gfx_mode
insmod gzio
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
linux /boot/vmlinuz-3.0.0-16-server root=UUID=d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac ro
initrd /boot/initrd.img-3.0.0-16-server
}
menuentry 'Ubuntu, with Linux 3.0.0-16-server (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod gzio
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
echo 'Loading Linux 3.0.0-16-server ...'
linux /boot/vmlinuz-3.0.0-16-server root=UUID=d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac ro recovery nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.0.0-16-server
}
submenu "Previous Linux versions" {
menuentry 'Ubuntu, with Linux 3.0.0-12-server' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
set gfxpayload=$linux_gfx_mode
insmod gzio
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
linux /boot/vmlinuz-3.0.0-12-server root=UUID=d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac ro
initrd /boot/initrd.img-3.0.0-12-server
}
menuentry 'Ubuntu, with Linux 3.0.0-12-server (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod gzio
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
echo 'Loading Linux 3.0.0-12-server ...'
linux /boot/vmlinuz-3.0.0-12-server root=UUID=d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac ro recovery nomodeset
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.0.0-12-server
}
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
submenu "Xen 4.1-amd64" {
menuentry 'Ubuntu GNU/Linux, with Xen 4.1-amd64 and Linux 3.0.0-16-server' --class ubuntu --class gnu-linux --class gnu --class os --class xen {
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
echo 'Loading Xen 4.1-amd64 ...'
multiboot /boot/xen-4.1-amd64.gz placeholder
echo 'Loading Linux 3.0.0-16-server ...'
module /boot/vmlinuz-3.0.0-16-server placeholder root=UUID=d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac ro
echo 'Loading initial ramdisk ...'
module /boot/initrd.img-3.0.0-16-server
}
menuentry 'Ubuntu GNU/Linux, with Xen 4.1-amd64 and Linux 3.0.0-16-server (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os --class xen {
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
echo 'Loading Xen 4.1-amd64 ...'
multiboot /boot/xen-4.1-amd64.gz placeholder
echo 'Loading Linux 3.0.0-16-server ...'
module /boot/vmlinuz-3.0.0-16-server placeholder root=UUID=d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac ro single
echo 'Loading initial ramdisk ...'
module /boot/initrd.img-3.0.0-16-server
}
menuentry 'Ubuntu GNU/Linux, with Xen 4.1-amd64 and Linux 3.0.0-12-server' --class ubuntu --class gnu-linux --class gnu --class os --class xen {
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
echo 'Loading Xen 4.1-amd64 ...'
multiboot /boot/xen-4.1-amd64.gz placeholder
echo 'Loading Linux 3.0.0-12-server ...'
module /boot/vmlinuz-3.0.0-12-server placeholder root=UUID=d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac ro
echo 'Loading initial ramdisk ...'
module /boot/initrd.img-3.0.0-12-server
}
menuentry 'Ubuntu GNU/Linux, with Xen 4.1-amd64 and Linux 3.0.0-12-server (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os --class xen {
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
echo 'Loading Xen 4.1-amd64 ...'
multiboot /boot/xen-4.1-amd64.gz placeholder
echo 'Loading Linux 3.0.0-12-server ...'
module /boot/vmlinuz-3.0.0-12-server placeholder root=UUID=d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac ro single
echo 'Loading initial ramdisk ...'
module /boot/initrd.img-3.0.0-12-server
}
}
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
insmod raid
insmod mdraid1x
insmod part_msdos
insmod part_msdos
insmod ext2
set root='(mduuid/be73165bc31d6f5cd00d05036c7b964f)'
search --no-floppy --fs-uuid --set=root d72bad3f-9ed7-44b9-b3d1-d7af9f62a8ac
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# 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.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
