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Re: [Linux-cluster] cluster and xen bridge issue



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 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 redhat com [mailto:linux-cluster-bounces 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.

 

 

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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