I spend recently some time trying to upgrade ubuntu in DomU on the Debian Dom0.
There are two things that need to be taken under consideration:
- in most cases Debian does not have kernel new enough to boot newer versions of ubuntu
- ubuntu linux-image-xen does not exist anymore.
Before you start make sure you have update-grub.
You can now run do-release-upgrade which should complete without any problems.
After that do apt-get install linux-image-ec2 (this is the only one working as a DomU)
Now you have to edit /boot/grub/menu.lst and repleace # indomU=detect with # indomU=false you can do that by using the following command : sed -ie ‘s/^# indomU=detect/# indomU=false/’ /boot/grub/menu.lst because from some reason if you have only -ec2 kernel installed it is not chosen as a domU kernel and not added to the boot menu.
At this stage you can run update-grub and shutdown your VM.
Now we can use pygrub in xen configuration file like this: (only the bit that is in bold needs to be changed in your xen config file)
disk = [
"phy:/dev/xm/sda1,xvda1,w","phy:/dev/xm/swap,xvda2,w",]bootloader=”/usr/lib/xen-3.2-1/bin/pygrub”# this should be left in case something does not work#kernel = “/boot/vmlinuz-2.6.26-1-xen-686″#ramdisk = “/boot/initrd.img-2.6.26-1-xen-686″memory = 320name = “domU”vif = [ "bridge=xen" ]root = “/dev/xvda1″extra = “nofb vga=normal xencons=tty”
Please note that order of the harddrives is important to pygrub and you might need to swap them to get it working.
Now is time to check if it worked do xm create -c domU and you should get a grub menu with your ec-2 kernel.
Hope that would help someone.
If something does not work at this stage you can use
/usr/lib/xen-3.2-1/bin/pygrub /dev/xm/sda1
which should display menu of available kernels without need to create vm.
also mounting the drive and chrooting to it might be neccesery to install additional packages (linux-kernel) or doing update-grub if you missed the step earlier
mount /dev/xm/sda1 /mnt
chroot /mnt
apt-get install linux-image-ec2
update-grub
ctrl+d
umount /mnt
Hey Paul,
I’m running xen with a Debian dom0 and I’m trying to install Ubuntu 10.04 LTS as a domU.
What do I need for this to work? If I want to create a fresh vm and not upgrading an old one.
Hope you could guide me
Thanks
Chris
Hi,
You can do the same thing:
install it using debootstrap
and then skip the instructions above to the point just after do-release upgrade (obviously that is the upgrade part) everything else should be executed on your new system
you can do it using chroot as your system is very unlikely to boot even once without this changes being done
Instructions on how to do a fresh install of lucid domUs on a Lenny system can be found here:
http://www.agileweboperations.com/xen-debian-lenny-dom0-with-ubuntu-lucid-guest/