"This document describes how to set up a two-node load balancer
in an active/passive configuration with HAProxy and heartbeat on
Fedora 8. The load balancer acts between the user and two (or more)
Apache web servers that hold the same content. The load balancer
passes the requests to the web servers and it also checks their
health. If one of them is down, all requests will automatically be
redirected to the remaining web server(s). In addition to that, the
two load balancer nodes monitor each other using heartbeat. If the
master fails, the slave becomes the master--users won't notice any
disruption of the service. HAProxy is session-aware--you can use it
with any web application that makes use of sessions like forums,
shopping carts, etc..."
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