Using pyGRUB on Squeeze to boot a domU kernel
Using pyGRUB from xen-utils-4.0, each domU can boot with its own kernel instead of using the dom0 kernel, which makes life easier for updates and multi distribution Xen installs. You need to have first a working domU. The domU FileSystem needs to be ext3.
On the dom0
You need to have your disk entries configured with the xvd xen driver, full block devices (ie not xvda1/2/3) to make grub in domU happy, and to have the system partition as the first partition listed in your domU.cfg disklist.
Config snippet:
root = '/dev/xvda2 ro'
disk = [
'phy:/dev/vg05/test2.openforce.com-disk,xvda2,w',
'phy:/dev/vg05/test2.openforce.com-swap,xvda1,w',
]
On the domU
Make sure /etc/fstab refers to the mount points refer to /dev/xvd{a,b}
Install the Xen kernel (for AMD64 linux-image-2.6-xen-amd64) and GRUB Legacy.
mkdir /boot/grub apt-get install linux-image-2.6-xen-amd64
You don't need to install grub, you need to create a simple grub file which will be read by pygrub on the Dom0.
Create first /boot/grub/menu.lst based on the content of /boot/.
cat > /boot/grub/menu.lst default 0 timeout 2 title Debian GNU/Linux 6.0 root (hd0,0) kernel /boot/vmlinuz-2.6.32-5-xen-amd64 root=/dev/xvda2 ro initrd /boot/initrd.img-2.6.32-5-xen-amd64 title Debian GNU/Linux 6.0 (Single-User) root (hd0,0) kernel /boot/vmlinuz-2.6.32-5-xen-amd64 root=/dev/xvda2 ro single initrd /boot/initrd.img-2.6.32-5-xen-amd64
On the dom0
- Check that grub was properly installed on the domU with
/usr/lib/xen-default/bin/pygrub /dev/vg02/my_domU-disk
which should great with the familiar grub menu, and then abort
Replace the kernel and ramdisk parameters in the domU config file with the following line.
bootloader = '/usr/lib/xen-default/bin/pygrub'