[lvs-users] Problem: Occasionally all traffic gest sent to a single backend node

[Graeme Fowler]

On Fri, 2008-01-18 at 18:35 +0900, kotobuki intl wrote:
> Anyhow does anyone else have this problem and ideally a fix?

Assuming that your monitoring graphs are being taken from the
realservers themselves and not the director(s), I'd say that you have
the ARP problem.

This means that one of your realservers has managed to tell the upstream
router that it's got the VIP. The router then bypasses the director(s)
and sends all traffic for a given VIP to the realserver directly. Your
clients see no difference - connections still work - but all traffic
being handled directly rather than via LVS.

Have you ensured that all of your loopback aliases on the realservers
are hidden?

http://www.linuxvirtualserver.org/docs/arp.html

You'll need to amend the instructions there accordingly.

Graeme