Pre-Installation Tasks for All Converged Application Server Systems

Before installing the Converged Application Server software, complete the following pre-installation tasks:

Perform general pre-installation tasks. See "General Pre-Installation Tasks".
Choose your Oracle home directory. See "Choosing an Installation Directory".
Install JDK on all machines in your Converged Application Server system. See "Installing the Java Development Kit".

General Pre-Installation Tasks

Complete the following general pre-installation tasks:

Allocate IP addresses for Converged Application Server interfaces, including:
- Public-facing external interfaces
- Internal-facing interfaces
- Intra-system interfaces for private signaling between Converged Application Server nodes
- If required by your organization, a separate systems management interface
Determine which logical interfaces map to which physical interfaces on each server.
Have access to a Domain Name Service (DNS) and Network Time Protocol (NTP) servers.
Optionally assign fully qualified domain names to each server.
Make a note of any required static routes.

Choosing an Installation Directory

When you install Converged Application Server, you are prompted to specify a Oracle_home directory. This directory serves as a repository for common files that are used by multiple Fusion Middleware products installed on the same machine. For this reason, the Oracle_home directory can be considered a central support directory for all of the Fusion Middleware products installed on your system.

The files in the Oracle_home directory are essential to ensuring that Converged Application Server and WebLogic Server operate correctly on your system. They facilitate checking of cross-product dependencies during installation.

For more information about selecting an installation directory, see Installing and Configuring Oracle WebLogic Server and Coherence.

Installing the Java Development Kit

Install Oracle Java Development Kit (JDK) plus the latest security update on each physical machine or VM in your Converged Application Server system. For a list of supported versions, see Software Requirements.

To install and configure your JDK:

Download the JDK from the Java SE Development Kit Downloads page at:
https://www.oracle.com/java/technologies/downloads/#java11
Install the JDK per instructions provided with it.
Add the JDK bin directory to the beginning of the PATH variable definition on the target system. For example:
```
PATH=$JAVA_HOME/bin:$PATH
export PATH
```