Keep your Web site online with a High Availability Linux Apache cluster

In a cluster environment, a high availability (HA) system is responsible for starting and stopping services, mounting and dismounting resources, monitoring the system availability in the cluster environment, and handling the ownership of the virtual IP address that's shared between cluster nodes. The heartbeat service provides the basic functions required for the HA system.

http://www.linux.com/article.pl?sid=06/09/25/155211

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