This chapter
provides the step-by-step procedure of uninstalling WEM application
using the GUI-based installation wizard and the console-based installation
method. Additionally, it provides instructions for backing up all
the critical files before starting the WEM uninstallation.
Understanding the
Uninstall Process
Upgrading the
Web Element software on the server requires that the currently installed
version be uninstalled from the server before the newer version
can be installed. Failure to do so will prevent your ability to
install the new WEM version.
IMPORTANT:
If you are uninstalling
WEM in any clustered setup prior to an upgrade, the node has to
be put into maintenance mode first (i.e. removed from the resource
group). This ensures that all the processes running on this node
are stopped and prevents the active node from failing over to become
the standby node. For more information on this procedure, please
refer to WEM High Availability
Redundancy with Cluster Application in the appendices.
Following is an overview
of the uninstall process.
Make Backup Copies
of All Critical Files
This step requires
that you archive, at a minimum, the following files.
Uninstall WEM Application
The process used
to perform this uninstall is dependent upon the method used to install
the version currently running. See the section below for information
on how to determine which installation method was used previously.
Whichever uninstall
method is used, it is generally preferable to install the new version
of the application using the GUI-based installation method.
Determining the Best
Uninstallation Method
The WEM, and
its ancillary components such as the Apache web server and PostgreSQL
database engine, may be uninstalled using one of two methods.
It is important to note
that the uninstallation method is independent of the method used
for installation. For example, if the console-based method was used
for installation, either the GUI- or console-based method can be
used to uninstall the program.