How to build a LAMP web cluster. This book will show you had to build a scalable and reliable web cluster using Open Source software. We'll use heartbeat to provide load balancer failover. ldirectord will load balance the web requests. To syncronize data amongst the web servers we'll use rsync+ssh. MySQL master<->master replication w/ heartbeat & ldirectord for database failover. We can add in master->slave replication for datbase scalability.