Know your gear
The Load Balancer Add-On is a set of integrated software components that provide Linux Virtual Servers (LVS) for balancing IP load across a set of real servers. The Load Balancer Add-On runs on an active LVS router as well as a backup LVS router. The active LVS router serves two roles: to balance the load across the real servers and to check the integrity of the services on each real server. The backup LVS router monitors the active LVS router and takes over from it in case the active LVS router fails.