4.3.7  Using a Clustered Environment

To access the User Portal when using a clustered environment, point the browser to the Load Balancer URL or to any cluster node URL (e.g., http://node1:8080/sree/Reports). The Portal's appearance and function is the same as in a single-server environment, but all user requests are transparently redirected to the Load Balancer.

Load Balancer

The Load Balancer distributes the requests to the different cluster nodes based on the balancing algorithm. It also continuously monitors the status of the cluster nodes at a regular interval. If a node becomes unresponsive, the Load Balancer detects the failure, removes the node from the node list, and stops forwarding requests to it. On recovery, the node is detected once again, and assigned new requests. The Load Balancer keeps track of sessions so that once a request is forwarded to a node, all subsequent requests from the same client will be forwarded to the same node. To view the activity of various nodes in the cluster, see Monitoring Server Activity.

Running the Scheduler on a Cluster Node

The Scheduler application can run on only one node within the cluster at a given time. To run the Scheduler on a cluster node, follow the steps below:

1. Open Enterprise Manager on Node 1, and open the 'Server' > 'Cluster' page.

2. In the 'Cluster Servers' table, select the node on which you want the Scheduler application to run.

3. Press the 'Start Scheduler' button to start the Scheduler on the selected node.

 

To stop the Scheduler on a given node, select the node in the table and press the 'Stop Scheduler' button.

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