High Availability != High cost

In today's world it's getting more important to serve users on a 24x7 period with as little downtime as possible. With Drbd and Heartbeat its possible to build a low-cost Master/Slave Cluster on Linux based Operation Systems without to much hustle. Get a brief overview how-to setup a Master/Slave-Cluster providing whatever service you need using low-cost hardware and Open-Source software.