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



On Fri, 29 Aug 2008 08:08:04 +0200
Chris Lalancette <clalance redhat com> wrote:

> 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.
> 
> Yes, true.  The difference is because of the asynchronous nature of taskomatic,
> we basically kick off the guest on the node, and then go on to do other things.
>  The next time we would hear anything about this guest is when host-status
> eventually polled it and noticed it "shutoff" (even though we think it is
> running).  So then we would need to perform the heuristic of "if this was
> install time, and the guest is now dead, restart it".  Just doing all of this
> out on the node will reduce our round-trips to the server, and do the whole
> thing in a more timely fashion.  That's why I think it is better to do this
> whole thing remotely on the node.

That could certainly work.  Also once qpid is setup and working we'll get updates about the domain dying much sooner and could respond then if necessary.  Sounds like the other method would be better however.

	Ian


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