ovirt-quantum integration

[Dan Kenigsberg]

On Tue, Nov 27, 2012 at 04:43:52PM +0200, Gary Kotton wrote:
> On 11/27/2012 04:38 PM, Dan Kenigsberg wrote:
> >On Tue, Nov 27, 2012 at 09:06:14AM -0500, Mike Kolesnik wrote:
> >
> >>>ix. I do not udnerstand the race when the VM starts. There is none.
> >>>When
> >>>a VM starts it will send a DHCP request. If it does not receive one
> >>>it
> >>>will send another after a timeout. Can you please explain the race?
> >>This is exactly it, the VM might start requesting DHCP lease before it was updated in the DHCP server, for us it's a race.
> >I think the point is that a guest dhclient may give up before Quantum
> >allocates it an IP. Maybe, due to timing and guests' behavior, the race
> >would not show up, but it is still there.
> 
> Yes, this is certainly something that can happen if there are
> networking problems or if something in the system is broken. How is
> it done today in oVirt? Does someone has to go and manually update
> the DHCP server?

It's not done in oVirt, we want to gain it from Quantum...
Now you'd have to log into the guest and re-initiate dhclient (or
restart the guest) after manually configuring the DHCP server.

> If the messaging is a real concern then you can piggyback to DHCP
> information on the RPC call to VDSM where the DHCP agent will be
> running. This will ensure that the information exists in the host
> file prior to running the VM.