This tutorial was written for the Debian Lenny distribution and supposes that the user has knowledge about what load balancing is and some basic skills of Linux, our two load balancers consist out of 2 machines that monitor each other [heartbeat], if the master stops responding the secondary one [Backup] will take the master role [Backup -> Master].

For this setup, we will need 3 IP addresses, 2 for each node and one virtual IP address that will be used by the master node (master node will catch this IP). At the end we will install Apache as our web server.

read more http://www.howtoforge.com/set-up-a-simple-high-availability-web-server-for-a-small-company-using-debian-lenny

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