[Linux-cluster] cluster and xen bridge issue

[Paras pradhan]

Thanks Jeff for the reply. It looks like bridge created by xen
network-script is somewhat different comparing to bridge created using
ifcfg-* (Referring to http://www.cyberciti.biz/faq/tag/full-bridge/)

Wondering why the network-script works (assuming no interference to cman)
when executed as root after login and doesnot work when used with
xend-config. Might be a question to the xen users .

Thanks
Paras.


On Mon, Aug 30, 2010 at 12:24 PM, Jeff Sturm <jeff.sturm at eprize.com> 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.)
>
>
>
> *From:* linux-cluster-bounces at redhat.com [mailto:
> linux-cluster-bounces at redhat.com] *On Behalf Of *Paras pradhan
> *Sent:* Monday, August 30, 2010 12:43 PM
> *To:* linux clustering
> *Subject:* [Linux-cluster] cluster and xen bridge issue
>
>
>
> Hi,
>
>
>
> I have a three node red hat cluster (for xen virualization) and everything
> is running great until I add a 2nd interface and 2nd bridge.
>
>
>
> This is how I added the 2nd bridge
> http://toic.org/2008/10/06/multiple-network-interfaces-in-xen/
>
>
>
> After reboot, cluster comes up fine and when xend comes up, cman dies.
>
>
>
> Log (from other node):
>
>
>
> --
>
> Aug 27 15:13:23 cvtst2 openais[6343]: [TOTEM] Retransmit List: 52 53
>
> Aug 27 15:13:23 cvtst2 last message repeated 3 times
>
> Aug 27 15:13:23 cvtst2 openais[6343]: [TOTEM] Retransmit List: 53
>
> Aug 27 15:13:23 cvtst2 openais[6343]: [TOTEM] Retransmit List: 53
>
> Aug 27 15:13:59 cvtst2 openais[6343]: [TOTEM] FAILED TO RECEIVE
>
> Aug 27 15:13:59 cvtst2 openais[6343]: [TOTEM] entering GATHER state from
> 6.
>
> Aug 27 15:13:59 cvtst2 openais[6343]: [TOTEM] FAILED TO RECEIVE
>
> Aug 27 15:13:59 cvtst2 openais[6343]: [TOTEM] entering GATHER state from
> 6.
>
> Aug 27 15:14:00 cvtst2 openais[6343]: [TOTEM] FAILED TO RECEIVE
>
> ---
>
>
>
> But if I execute as root (for 2nd bridge) : /etc/xen/scripts/network-bridge
> start vifnum=1 netdev=eth1 bridge=xenbr1,
> I am not seeing any issue.
>
>
>
> It looks like after the cman started , xend is trying to reconfigure the
> both bridges and cluster dies.
> I hope I explained properly.
> Need some help
> Thanks
> Paras.
>
>
>
>
>
> --
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