Re: Linux domU ??

[matthew sporleder <msporleder%gmail.com@localhost>]

On 5/23/09, joe mcguckin <joe%via.net@localhost> wrote:
>  I'm trying to get Linux domU's going and I've gotten stuck.
>
>  I seem to have successfully installed CentOS into a file, but when I try to
> boot the domain it complains about not being able to find a
>  valid boot device.
>
>  Can someone offer some advice?
>
>  config file:
>  kernel = "/tmp/centos-5-xen-vmlinuz.img"
>  ramdisk = "/tmp/centos-5-xen-initrd.img"
>  memory  = '512'
>  name = 'CentOS'
>  vcpus=1
>  disk = [ 'file:/usr/xen/centos.img,xvda,w' ]
>  vif = [ 'bridge=bridge0' ]
>  boot = 'd'  #d is cdrom boot, c is disk boot.
>  on_poweroff = 'destroy'
>  on_reboot   = 'restart'
>  on_crash    = 'preserve'
>
>  boot error:
>     VFS: Cannot open root device "<NULL>" 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)
>
>  adding "root=/dev/xvda' results in:
>
>  VFS: Cannot open root device "xvda" 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)
>

Can you try something other than xvda on the file: line like hda0?

It sounds like your centos kernel doesn't have the xen* modules
compiled into it.