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Joseph Mack NA3T wrote :
> On Wed, 8 Aug 2007, Matthias Saou wrote:
>
> > I can't set up localnode, as the director and the real server are two
> > separate "logical" servers, no loopback possible.
>
> I guess I should have seen that.
>
> > Tips to try and debug this setup would be very welcome too ;-)
>
> There were a bunch of people talking about LVS on virualised
> machines in Jul.
>
> http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.virtualised_realservers.html
>
> you might contact them to see if any of them were running
> the director out of the virtualised machine.
Oh, I hadn't seen that page. Unfortunately, not many implementation
details, and the focus seems to have been on OpenVZ/Vserver, which is
quite different than a Paravirtualized Xen.
I'm still troubleshooting the problem. Now I'm back from exactly 16k to
exactly 12k of data before the connection stops, and saw a bit more of
what happens : The real server and the director continue answering, but
the client sees all further packets as a different tcp connection. For
instance, my local stateful firewall drops and logs all of those
further packets.
I don't know if I'll be able to figure out why. It does seem like a
connection tracking problem somewhere on the Xen Host (dom0), or maybe
the Xen guests (domU), but I doubt it.
BTW, reproducing the problem seem pretty easy if anyone wants to also
enjoy the fun of debugging the issue :-) All it takes is a working Xen
setup on a machine with 2 NICs.
Matthias
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