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Setting Up A High-Availability Load Balancer With Perlbal/Heartbeat On Debian EtchJan 18, 2009, 08:04 (0 Talkback[s])
(Other stories by Falko Timme)
[ Thanks to Falko Timme for this link. ]
"Not only does the load balancer distribute the requests to the two backend Apache servers, it also checks the health of the backend servers. If one of them is down, all requests will automatically be redirected to the remaining backend server. In addition to that, the two load balancer nodes monitor each other using heartbeat, and if the master fails, the slave becomes the master, which means the users will not notice any disruption of the service. Perlbal is session-aware, which means you can use it with any web application that makes use of sessions (such as forums, shopping carts, etc.)."
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