How do I Configure Web Load Balancer Using XML?

A Load Balancer works as a Web-request dispatcher, distributing the Web requests across a set of Web/J2EE cluster nodes. In advanced configurations, it distributes the Web requests even across non-cluster server instances and multiple vendor’s servers. Load Balancing for EJB clusters is done at the container level and does not need any external configuration.

A Load Balancer is a variant of Web node. The steps involved in setting up a Load Balancer are:

The DIR and the configuration files have to be setup in a similar manner as for a Standalone instance.
Copy the server-config.xml and web-lbconfig.xml into the config DIR.
Enable the Load Balancer in web-config.xml: request-dispatcher enabled="true" name="web-lbconfig.xml"
Configure the Load Balancer properties in web-lbconfig.xml. The nodes are referenced by their name:

<node name="node1" host="192.168.1.1" web-port="8383"> <naming-port>9393 <socket-pool enabled="true" min="20" max="50" pool-idle-timeout-seconds="100"/> </node>

You can also configure node chooser and node group information from web-lbconfig.xml.

The following table lists all parameters for configuring a Web Load Balancer:

Table 1: Dispatcher Configuration Parameters

Tag Attribute Option Description

node - Enter here the details for a node.

- name Enter here a unique name specifying the node.

- type Enter here the type of cluster.

- host Enter here the host name.

- Web port Enter here the port where the node listens for requests.

- socket pool (min) Enter here the minimum socket pool size.

- socket pool (max) Enter here the maximum socket pool size.

- pool-idle-timeout-seconds Enter here the request time out in seconds.

node group - Enter here the details for a node group.

- name Enter here a unique name specifying the node group.

- type Enter here the type of cluster.

- node-ref Enter here the name by which the node group is referred.

node chooser - Enter here the details for a node chooser.

- name Enter here a unique name specifying the node chooser.

- class Enter here the implementation class for this node chooser.

- host name Enter here the node chooser host name.

- URI Pattern Enter here the URI pattern for mapping requests.

failover node chooser - Enter here the details for a failover node chooser.

- name Enter here the name specifying the failover node chooser.

- class Enter here the implementation class for this failover node chooser.

- type Enter here the type of cluster.

- enable Enter here the state of the failover node chooser.

Related Topics:

Tag Attribute	Option	Description

node	-	Enter here the details for a node.
-	name	Enter here a unique name specifying the node.
-	type	Enter here the type of cluster.
-	host	Enter here the host name.
-	Web port	Enter here the port where the node listens for requests.
-	socket pool (min)	Enter here the minimum socket pool size.
-	socket pool (max)	Enter here the maximum socket pool size.
-	pool-idle-timeout-seconds	Enter here the request time out in seconds.
node group	-	Enter here the details for a node group.
-	name	Enter here a unique name specifying the node group.
-	type	Enter here the type of cluster.
-	node-ref	Enter here the name by which the node group is referred.
node chooser	-	Enter here the details for a node chooser.
-	name	Enter here a unique name specifying the node chooser.
-	class	Enter here the implementation class for this node chooser.
-	host name	Enter here the node chooser host name.
-	URI Pattern	Enter here the URI pattern for mapping requests.
failover node chooser	-	Enter here the details for a failover node chooser.
-	name	Enter here the name specifying the failover node chooser.
-	class	Enter here the implementation class for this failover node chooser.
-	type	Enter here the type of cluster.
-	enable	Enter here the state of the failover node chooser.


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