load balanced server farm in php with sql

What is the best configuration for a load balanced server farm for a high demand download web page that uses php and mysql. I have servers that currently use centos with lightppd.
Has anyone got experience of what software is the best etc, or a good guide.

I use apache for my web server and it works fine.

You have to install another package or service to acquire load balancing. I experience using heartbeat and ldirectord. Please refer here for more instructions and guides. http://www.ultramonkey.org/

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