[Linux-cluster] cluster and xen bridge issue

[Tom Lanyon]

On 31/08/2010, at 2:54 AM, Jeff Sturm wrote:
> 
> The network-bridge script does some pretty horrific things to networking while it starts.  I’m not surprised if the interruption is enough to cause CMAN to fail.
>  
> We avoided this by not using Xen’s network-bridge utility.  Just configure your physical interfaces and bridge devices in /etc/sysconfig/network-scripts, and specify a bridge name in each /etc/xen/<domU> script.  (In xend-config.sxp you can set network-script to “/bin/true”.  Just remember to also turn on IP forwarding.)
>  
> The advantages of doing it this way are that you get tighter control over your host networking, and starting/stopping xend won’t interrupt networking.  (The main disadvantage is that the networking configuration is harder to port to a non-Red Hat OS, but if you already need clustering that probably doesn’t matter.)


For what it's worth, we do the same thing. Set network-script to /bin/true in xend-config.sxp and configure our own bridges via regular ifcfg scripts in /etc/sysconfig/network-scripts/. Much more stable and predictable this way.