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Configuring OracleAS Web Cache Cluster for Scalability and Failover

Purpose

This tutorial describes how to add an instance of OracleAS Web Cache to a cluster and propagate changes.

Time to Complete

Approximately 10 minutes

Topics

This tutorial covers the following topics:

	Overview
	Prerequisites
	Adding a Cluster Member
	Propagating Configuration Changes
	Summary
	Related Information

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Overview

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To increase the availability and scalability of your Web site, you can configure multiple instances of OracleAS Web Cache to run as members of a cache cluster. The cluster members share common configuration characteristics and content ownership. A significant benefit of this feature is that the cluster members are capable of failure detection. A cache cluster can contain two or more instances of OracleAS Web Cache, and so you must have two or more instances of OracleAS Web Cache installed on a single machine or multiple machines before you configure a cache cluster. For load balancing options, refer to the Oracle Application Server Web Cache Administrator's Guide, 10g Release 2 (10.1.2)

Prerequisites

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Before starting this tutorial, you should:

1.	Have completed the OBE titled "Configuring OracleAS Web Cache for Caching a J2EE Application"
2.	Have completed the OBE titled "Configuring OracleAS Web Cache for Session Binding and Load Balancing"

Adding a Cluster Member

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To add an instance of OracleAS Web Cache to a cluster, perform the following steps:

1.	On the Oracle Enterprise Manager 10g Application Server Control Console, click Web Cache to navigate to the OracleAS Web Cache Home page.
2.	Navigate to the Administration page. Under Cluster properties, click Members and Properties.
3.	Click Add to add a cluster member. Enter the following values for the corresponding fields and then click OK: Cache Name: SecondWebCache (or anything you want) Hostname: localhost Administration Port: 4003 Protocol: HTTP Capacity: 30 Click OK when you see the confirmation message.
4.	Click Restart Web Cache to restart Web Cache. Click Yes when prompted for confirmation.

Propagating Configuration Changes

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When you modify the cluster and apply changes, OracleAS Web Cache adds the cache-specific information from the new cache cluster members to the configuration. For those changes to take effect in all cluster members, you must propagate the configuration and restart the cache server process of the cluster members. To propagate configuration changes, perform the following steps:

Click Goto cluster operations page.

On the Cluster Operations page, select the new cache cluster member and click Propagate to.

Click Yes to acknowledge the propagation.

Select both instances and click Restart.

Click Yes when prompted for confirmation.

Summary

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In this lesson, you have learned how to:

Run OracleAS Web Cache in cluster mode.

Related Information