openstack team mailing list archive

[Sylvain Bauza <sylvain.bauza@xxxxxxxxxxxx>]

Le 19/02/2013 13:31, Gary Kotton a écrit :
> The problem is as follows:
> When you reboot the host the openvswitch will create the interfaces on 
> restart. this causes problems with the dhcp and the l3 agents.
> the solution to this is to run the quantum-ovs-cleanup utility on 
> reboot prior to the dhcp and the l3 agents.
>
> thanks
> Gary

Hi Gary,
As I was stresstesting Quantum, I did noticed that the issue is similar 
on my compute node : instances are unable to get DHCP address.

A quick look at network level shows that there is no GRE encapsulation 
over DHCP packets.
I tried removing/adding br-int/br-tun, but the virtual network 
interfaces (qvo) don't bridge to br-int if the VM was previously launched.
Spawning a new VM is successful, but rebooting (either by virsh 
destroy/start, or thru Horizon) doesn't allow the qvo interface to be 
attached again. A restart of nova-compute doesn't do the trick either.

Any idea ?
Thanks,
-Sylvain

> > Thanks,
> > -Sylvain
> >
> >
> >
> > Le 18/02/2013 18:06, Sylvain Bauza a écrit :
> > > Hi,
> > >
> > > I'll try to be clear. I do follow a classic setup for Quantum with 2 
> > > NICs and a GRE tunnel in between nodes with br-int/br-tun.
> > >
> > > Everything is fine at first install, but when rebooting the network 
> > > node (including quantum-ovs-plugin-agent, quantum-l3-agent and 
> > > quantum-dhcp-agent), I notice that DHCP assignation is failing for 
> > > my VMs.
> > > A tcpdump shows at physical level that GRE packets are arriving on 
> > > eth0 (mgmt NIC) on network node (for DHCP request) but no reply is 
> > > done by the network node.
> > >
> > > The workaround I found is to delete br-int and br-tun on network 
> > > node, create only br-int and restart both services 
> > > (quantum-{ovs-plugin,l3,dhcp} ) to get things done.
> > >
> > > This is quite brutal. Do you know if it's a known bug, or something 
> > > bad with my setup ?
> > >
> > > Thanks,
> > > -Sylvain
> >
> >
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