How can i builed my own Load Balancer?

Lets say that I have 4 Server (same hardware, same OS centOS 4.0).
I have another server (like p3 512sdram 80gb).

How can i make the 4 server update at the same time (mysql, ftp..), how can i program the p3 server to balance the server?

thanks.

 

 

 

 

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