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

[Nathanaël Blanchet]

Tanks all exactly what I was looking for :)

Le 01/06/2012 17:16, Shahar Havivi a écrit :
> On 01.06.12 17:40, Itamar Heim wrote:
>> 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.
> Today you cannot do that because the hook didn't designed to do that.
> By modifying the hook you can add a<boot order='1'/>  to the disk and change
> the other device boot order to higher number.
>
> Take a look at this links:
> http://libvirt.org/formatdomain.html#elementsDisks
> http://libvirt.org/formatdomain.html#elementsNICSBoot
> and look for the string 'boot order'

-- 
Nathanaël Blanchet

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