Introduction to Upgrading Web Server

When upgrading Release 4 Web Server to Release 5, consider the following aspects of the upgrade process:

• General Upgrade Approach. The upgrade is performed by doing a fresh install of Release 5 Web Server, migrating Release 4 Web Server instance configuration information to a Release 5 configuration, and then creating Release 5 Web Server instances that correspond to the Release 4 instances.

• Upgrade Dependencies. Web Server has dependencies on a number of Java ES shared components, all of which are automatically upgraded to Release 5 by the Java ES installer when you perform an upgrade of Web Server. These dependencies are listed in Table 1–7. Web Server has hard upgrade dependencies only on NSS and NSPR shared components.

  Backward Compatibility. Release 5 Web Server is backwardly compatible with the Release 4 version.

  Upgrade Rollback. Rollback of the Release 5 upgrade is achieved by reverting to the Release 4 installation, which remains intact.