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How to set Grub to automatically load Xen kernel

rated 0 times [ 0] [ 0] / answers: 1 / hits: 12093 / 1 Year ago, wed, may 31, 2023, 1:09:42

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 ###

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nquirewha

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answered 1 Year ago deringach · Accepted Answer

Through trial and error, I found that it works if I use the submenu name "Xen 4.1-amd64" for GRUB_DEFAULT. I still don't understand why using the menuentry name didn't work...