Re: [Xen-users] problem with static routes

[Greg Woods <woods@xxxxxxxx>]

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.


> I'm not sure you've configured static routes correctly though. See
> http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.5/html/Deployment_Guide/s1-networkscripts-static-routes.html

I will have to give this a try. First I've ever heard of a route-eth0
file. The network service startup script (/etc/rc.d/init.d/network)
clearly uses the /etc/sysconfig/static-routes file. 

One thing I have determined is that whatever is dropping the routes, it
is happening after booting is complete. Since rc.local is the very last
boot-time service executed, and "netstat -r -n" shows that the static
routes are properly there at that time, it has to be something that
occurs after initial boot that is removing them. 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.

I realize this is not "definitive proof" that Xen is at fault. I am not
trying to point fingers or file bug reports at this point, I am just
trying to troubleshoot.

--Greg



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