Installation guide

Creating Pramati Server Clusters Using

XMLs

Pramati Server features a powerful clustering solution. A cluster is defined as a group of

nodes. Pramati Clustering solution offers transparent, self-organizing, homogenous web

based configuration and management allowing easy EJB and Web clustering. When an

application is deployed on any one of the cluster nodes, it is automatically replicated across

all running cluster nodes. For a client, this translates to a single server view of the cluster.

Server clustering is self-organizing. Adding or removing nodes does not require restarting of

the cluster. When a node is added, the load is automatically distributed across all the nodes

based on their weight.

All the J2EE Services like Naming, Resource, Security and Transaction are automatically

replicated across all the nodes across the cluster. Non-J2EE services like locking, application

synchronization, load balancing, and failover are designed such that all complex cluster

mechanics are hidden ensuring a single server view of the client.

Server clustering provides both EJB and Web clustering. Each Server node has its own set of

replicated and non-replicated services. Pramati Cluster supports Web, EJB and BOTH

Cluster-node types. Types of Clustering supported are:

•J2EE clustering

• Message Server clustering

Cluster Definition

Cluster definition involves:

• Defining a logical cluster: Comprises of defining the common configuration and state

persistence information

• Defining the nodes of the cluster

The initial definition of the cluster is made in the XML of the first node of the cluster. Once

the basic cluster attributes are defined in the

cluster-config.xml. The cluster type is

defined by the Cluster-node definition in the

cluster-config.xml as shown in the

following code snippet:

<node>

<computer-name>127.0.0.1</computer-name>

<naming-port>9191</naming-port>

<http-port>8181</http-port>

<node-type>BOTH</node-type>