Installation guide

Adding Web Load Balancer using

Administration Service

Pramati Server provides a software based load balancing solution. It is implemented as an

Interceptor which is a part of the Interceptor stack in the Pramati Web Container.

Configuring the Load Balancer is as simple as adding entries into the

web-lbconfig.xml

file. Pramati Server’s Load Balancer intelligently distributes load among a group of nodes.

While distributing load it also takes into consideration factors like session stickiness, thus

sending session based requests to the node where the session was initiated. It also acts like a

normal Load Balancer, a URI based director and also a failover node.

This chapter describes the steps to create, modify and remove a Pramati Load Balancer

using Server Administration Service. Before getting into the details of setting up the load

balancing, let’s discuss a few scenarios.

To know more about the concepts and architecture of the Load Balancer, please refer to the

chapter “Request Dispatcher Architecture”, in the Technical Reference guide.

Load Balancing Scenarios

In this section, we’ll discuss a number of scenarios where the Request Dispatcher in Load

Balancer can be used. A typical load balancing scenario is depicted by the following

diagram:

Case 1 The Request Dispatcher (RD) intercepts all requests to a set of homogeneous

machines. In this case the dispatcher would not serve any request on its own:

Typical Setup:

• RD as a Load Balancer