From: Basil Hussain (basil.hussainIZZATkodakweddings.com)
Date: Mon Jul 12 2004 - 06:18:33 EDT
I have a strange problem that I hope someone may be able to shed some light
First, let me explain my set-up. I have two physical servers being
load-balanced by a Foundry ServerIron XL. I am balancing four web sites over
both. Because of the need to do SSL on more than one web site, I have to do
IP-based virtual hosting. Therefore, I have set up a virtual network
interface (using Linux IP aliasing) for each site. So, it looks like:
I have eight real servers set up on the LB (one for each server/site combo),
along with four virtual servers (one for each web site). Each virtual server
is therefore bound to two real servers.
The problem I am having is that my ServerIron keeps logging errors approx.
every minute telling me that two of my real servers are failing level 4
11-07-2004 23:59:33 ServerIron, L4 server 10.1.1.110 server-b-site-a port 80
11-07-2004 23:59:35 ServerIron, L4 server 10.1.1.100 server-a-site-a port 80
11-07-2004 23:59:39 ServerIron, L4 server 10.1.1.100 server-a-site-a port 80
11-07-2004 23:59:39 ServerIron, L4 server 10.1.1.110 server-b-site-a port 80
But, strangely, it only gives errors for site A! No problems at all with all
other sites! Also, it doesn't complain about port 443.
What possible reasons could there be for this behaviour?
-- Basil Hussain I.T. Systems Developer and Administrator, Kodak Weddings basil.hussainIZZATkodakweddings.com
P.S. In case anyone asks why I have eight real servers defined, one for each server/site combination, it is because of the non-contiguous IP addresses. Otherwise, I would use the 'host-range' command...
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