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Configuring Server Failover

Bright Tiger uses a concept called IP Aliasing to accomplish Web server failover. To enable failover, two or more Web servers run ClusterCATS Server on the same subnet. Failover relies on IP aliasing being available clusterwide, so there must be at least two Web servers running ClusterCATS Server on each subnet throughout the cluster. A widely distributed cluster could consist, for example, of two or more servers on each subnet in the cluster.

Each ClusterCATS Server sends out a heart beat on a periodic time interval. If a heart beat is not heard from a server, a remaining web server in the cluster will assume the failed server(s) IP address and begin accepting requests intended for the failed server.

If either of the servers in the cluster fail, the remaining server assumes the failed server's IP address, becoming the Alias Server. Once the Alias server assumes a failed server's IP address, it handles all HTTP traffic addressed to the failed server.


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