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Introducing Elasticity for Dynamic Clusters with Apache

This article updates an earlier blog by replacing Oracle Traffic Director (OTD) with Apache.

The WebLogic Server Elasticity Framework

The following diagram shows the different components of the elasticity framework for WebLogic Server:

Integration with Apache

The elasticity framework integrates with Apache through the WebLogic Apache Proxy Plug-In. By default, the plug-in parameter  DynamicServerList is ON, so when a scaling event occurs, the plug-in recognizes the correct servers in the cluster and routes the requests accordingly. Also, the lifecycle management services for the domain need to be enabled, as described below.

To enable the Lifecycle Manager on the WebLogic Server domain:






In the meantime, you can download a demonstration of policy-based scaling with Apache integration from here. See the documentation on how to set it up and run it here.


Policy-Based Scaling demonstration files and documentation:

WebLogic Server Documentation

Configuring Elasticity for Dynamic Clusters in Oracle WebLogic Server

Configuring WLDF Policies and Actions

Dynamic Clusters Documentation

Java EL 3.0 Specification