[Users] booting a vm on a raw file disk definated in a hook script

[Itamar Heim]

On 05/25/2012 05:47 PM, Nathanaël Blanchet wrote:
> Hi all,
>
> I'm using this hook script :
> http://gerrit.ovirt.org/gitweb?p=vdsm.git;a=blob;f=vdsm_hooks/vmdisk/before_vm_start.py;h=191d5c1af533e11d699b1d715d3c1ea60e28b787;hb=6817f1c6e3f5bc137d1f3bef45a2d0191465c7a3
> My goal is to boot a vm on a vm image imported form libvirt/kvm. I want
> to use this single image, that is to say without importing it into ovirt
> with tools like v2v.
> acathrow told me on irc that I'd have to change the boot order in the
> xml, but I don't know how to proceed for many reasons:
>
>   * I can't create a vm through the UI which would boot on the disk
>     created by the hook script without first creating a disk on the
>     relevant storage domain. If I try I have those warnings :
>
>     hook: Cannot run VM without at least one bootable disk.
>     Alternatives:
>     -Create a disk for this VM, and rerun the VM.
>     -Change the boot sequence using the Edit VM command (Boot Option
>     Sub-Tab).
>     -Use the Run-Once command to select a different boot option and
>     rerun the VM.
>   * If I run a vm with the first disk from the storage domain and an
>     additional disk from the hook script, how could I change the boot
>     order in the xml definition file if I don't know the xml definition
>     of the main disk?
>
>
> thanks all for your help

1. i guess you can change the script to fix the boot order.
2. you can create a VM with a disk the same size, and just copy your 
converted disk over it (cp for nfs, dd for iscsi), instead of using the 
hook.