Setting Up A High-Availability Load Balancer With Perlbal/Heartbeat On Debian Etch(2009-01-18 08:04:12) HowtoForge: "This article explains how to set
up a two-node load balancer in an active/passive configuration with
Perlbal and heartbeat on Debian Etch. The load balancer sits
between the user and two (or more) backend Apache web servers that
hold the same content."