HTTP Load Balancing in WebLogic

HTTP Load Balancing in

WebLogic

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Agenda

Basic Concept

WebLogic Plug-Ins

Session Replication

Common Issues

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Why to have Load Balancing

Requests distribution among servers

States replication

Fail-over and fail-back

HTTP protocol doesn’t have native support for request

distribution and fail-over

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3 ways to distribute requests

Hardware Load Balancer

F5 Big-IP

Nortel Alteon

…

WebLogic Plug-Ins

Only Round-Robin

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Requirements for Load Balancer

When SSL persistence is used, the load balancer performs all encryption and decryption

of data between clients and the WebLogic Server cluster. The load balancer then uses

the plain text cookie that WebLogic Server inserts on the client to maintain an

association between the client and a particular server in the cluster.