[Fedora-xen] problem creating my 1st VM

[Olivier Renault]

Guillaume wrote:
> Hi list,
> I' trying to create my first vm with Xen, and I experience some problems.
> I follow some How to's  and xen docs to build my own config file, but
> maybe, there are some errors inside it.
> I have the following problem, after i start my guest domain, the
> kernel boot & then a kernel panix is displayed :
> 
> VFS: Cannot open root device "hda1" or unknown-block(0,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
> 
> I try to start this Virtual machine from vmware workstation where i
> install Xen (Dom0 work perfectly).
> 
> My config is make up of these lines :
> kernel = "/boot/vmlinuz-2.6.20-2936.fc7xen"
> root = "/dev/hda1 ro"
> name = "test_Linux"
> cdrom = "/dev/cdrom"
> memory = "128"
> builder = "linux"
> name = "linux"
> disk = [ "file:/xenroot/linux/linux.xdi,hda1,w" ]
> 
> Additionnals questions :
> a) Does i must use a modified Xen linux kernel, or, can I use a
> "normal/standard" kernel to boot up my VM?
> b) Is it possible to start a fresh install of Fedora directly from dvd
> in a guest domain (I mean without creating & mounting disk image/VM
> partition and copying root file system in it? If yes, how ?
> 
> Thanks for your replyes.
> 
Hi,

I am not sure how you have installed your VM ? You should try to 
reinstall the VM using virt-install (command line) / virt-manager (GUI).

It is not great to try a virtualisation solution inside another one ( 
you may have strange behaviour / poor performance ).

a) You need to run the xen kernel in order to use xen.

b) To install a paravirtualise VM you will need to have an install tree 
exported as http. You can simply mount the DVD on /var/www/html and 
start the http server.

You may want to read
http://fedoraproject.org/wiki/Docs/Fedora7VirtQuickStart

Good luck,
Olivier