[Ovirt-devel] VM Installation problem (and proposed solution)

Perry N. Myers pmyers at redhat.com
Thu Aug 28 20:16:30 UTC 2008

Daniel P. Berrange wrote:
> On Thu, Aug 28, 2008 at 05:20:06PM +0200, Chris Lalancette wrote:
>> Hello all (Ian especially),
>>      apevec pointed out a problem with installation of guests under oVirt.  What
>> currently happens is that after you finish the installation of (say) Fedora in a
>> VM, the VM reboots, but then immediately PXE boots again.  This is because we
>> haven't killed the guest and re-defined the XML to have the boot device be the
>> hard drive, like it should.
> You don't have to wait for installation to finish before re-defining the 
> XML with hard drive as the boot device
> You can define the post-install XML config the moment the guest has booted.
> When it shuts down, libvirt will automatically switch over to the newly
> defined config.  This is how virt-install handles it.
> Daniel

If the guest does a soft reboot does the libvirt configuration get 
reloaded at all?  (I would think not)  In this case the process would look 
like the following:

1. Message sent to ovirtd on Node saying 'install_vm'
2. ovirtd defines vm to boot PXE/ISO or whatever and sets on reboot to
3. ovirtd starts vm
4. ovirtd redefines vm to boot hd and turns off destroy on reboot
5. When guest soft reboots, the vm is destroyed causing the new libvirt
    configuration to be loaded when it is started next
6. ovirtd restarts the domain when it detects the domain has been

Does that sound reasonable?


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