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Hi,
In many of the howto-s, and other such documents, people are constantly
refering to the arp-problem.
I'm currently setting up a load balanced direct-routing scheme where
each real-web-server can act as the load-balancer. Meaning: with 20
web-servers (okay, only 4 around here), not only 19 webservers can die,
but also 19 load balancers :).
But in the current setup I did not find anything resembling the
arp-problem.
My setup is this:
All web-servers have their own IP's. Next to that, they all have the
VIP's that are loadbalanced. The webserver doing the balancing also
has an alias for the DIP. On the router the routeing to the VIP net
is gatewayed to the DIP. So no arp-problems there.
Actually: no machine is ever going to arp for the VIP. And when they
still do, it can only be local traffic, and hence, it would not be
a problem :).
Now I have to fail-over the load-balancer, and choose a new
load-balancer from many...
But for now: no crashes, no memory leaks. For 3 servers currently a
top of 955 req/sec. No connection problems. Max. streaming speed:
9 MegaByte/s, which is actually the max of the switch, not of the
systems...
It runs rock-solid :)...
Future tests:
A lot of editing the ipvsadm tables, and changing weight etc...
--
Ard van Breemen, T(elegraaf)E(lektronische)M(edia)
http://www.faqs.org/rfcs/rfc1855.html
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