Update 1 (Nov 21, 2011):
- added 3rd interface as host-only-adapter (hadoop1)
- enabled trusted device eth2
The appliance is created with VirtualBox, because it runs on OSX and Windows very easily. The idea behind it is to check new settings in a small environment rather easily; the appliance is designed for research, not for development and really not for production. The appliance has 4 nodes, one master and 3 slaves. The setup is not perfect, but it matched the environment I created it for. We have no seperate secondary namenode, for example. I set up hdfs, hive with mysql-metastore, hBase in distributed mode with zookeeper and stargate.
Before we can play with our own LAB we have to consider that we need some specials before. Please read the site  I created for.