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Re: [Xen-users] problem with static routes

On Tue, Aug 24, 2010 at 12:25 AM, Greg Woods <woods@xxxxxxxx> wrote:
> On Mon, 2010-08-23 at 23:32 +0700, Fajar A. Nugraha wrote:
>> ... and how did you determine that your setup works without Xen?
> I have not definitively done that yet. It would require taking down the
> entire cluster including all the VMs, then removing the xen resources
> from the cluster configuration, resulting in an extended down time for
> all the VMs. I did determine that putting the routes back in the bridge
> startup script works around the issue.

Why take down everything?

What I meant was whether the static route setup works without Xen. It
should be something as simple as:
- installing normal (non-xen) kernel (if not already installed) on one
of the nodes
- reboot choosing that kernel

That would at least verify whether the routes stay on after booting or
not, and whether some startup script removes it. The only different
(startup-script wise) between the default normal and xen kernel setup
is that xen's network-bridge script shouldn't be running.

If it works -> probably xen's network-bridge does something wrong, and
you should definitely file a bug to RH
If it still doesn't work (routes still missing several minutes after
boot, or not appearing at all) -> something else is causing problems
in your setup.

> The main reason for
> suspecting xen networking is that there are "ip route delete" commands
> in some of the scripts. That is the only place on the system I have
> found anything like this. I have other high availability clusters that
> do not have Xen where this issue does not occur.

Is it part of /etc/xen/scripts/network-bridge?

If yes, you can also test disabling the script and create your own
bridge. Someting like

With this setup, don't forget that the IP address settings will be in
the bridge's config file (br0, xenbr0, or whatever bridge name you
choose) instead of eth0.


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