HADB (used for high availability session storage) works with Application Server to provide failover capabilities that include session persistence.
This example provides guidelines for implementing a two-node HADB cluster with load balancing. However, a preferred solution is to install HADB on four hosts with nothing else installed on them. The domain administration server (DAS) with a copy of HADB for administration and a load balancer and Web Server would be installed on a separate machine.
On a partitioned operating system, a preferred solution is that two servers be installed (either host or zone) with at least one HADB process running on each.
Application Server requires a local copy of HADB and Message Queue. Application Server and HADB must be on the same host so you can use the integrated management tools provided by Application Server. The Load Balancing Plugin subcomponent of Application Server requires a web server. This example uses the Web Server as the container.
The general tasks include:
Installing the product components
Starting the servers
Configuring load balancing
You can use the following guidelines to install all product components on a node or zone. On subsequent nodes, install the product components required by your deployment. A minimum of two installation sessions are required.
The following high-level tasks are required:
Checking the installation sequence guidelines
Check to see what guidelines apply to this example and make adjustments as needed.
Checking the installation prerequisites
Check to see what tasks you might need to perform for this installation before starting.
Verifying that the hardware is connected correctly for your cluster
Running the installer
At component selection, choosing Application Server
Message Queue, HADB, and all the subcomponents of Application Server except the Application Server Node Agent and Load Balancing Plugin are automatically selected.
Expanding the Application Server product component and selecting Load Balancing Plugin.
You must install Web Server and Load Balancing Plug-in using the same file system access permissions.
The installer verifies software on your host and provides guidance if incompatibilities are identified.
Selecting the Configure Now type
Message Queue requires no configuration.
The configuration pages are displayed for product components that can be configured during installation. Gather your configuration information from the table in HADB Configuration Information in Sun Java Enterprise System 5 Installation Reference for UNIX.
Running the installation
Viewing the Installation Summary and Log
Starting the product components:
Completing HADB postinstallation configuration
Completing load balancing configuration