The complete Open Source High Availability and Scale-Out Architecture Stack

Legend

• DRBD: Distributed Replicated Block Device
• LVM:Logical Volume Manager
• Lighttp: light footprint + httpd = LightTPD (pronounced lighty)
• Cacti:
• Nagios: Nagios is an open source host, service and network monitoring program.
• mon: mon is a scheduler and alert management tool used for monitoring service availability and triggering alerts upon failure detection
• MySQL Cluster http://dev.mysql.com/doc/refman/5.1/en/mysql-cluster.html
• LVS: Linux Virtual Server. A fully transparent and high available load balancer.