This may be a rare requirement, but if the server is not available on hand. You might consider doing this first.
Specific Tomcat how to build a cluster, it is not here to elaborate. Write only the same computer to deploy multiple sets of clusters need to be modified and noted.
First, Apache
First Apache, the same computer installed more than one Apache need to copy the original copies.
Modify conf/httpd.conf
1. There will be some Apache paths in the file that need to be replaced with a new location
2. The port number needs to be changed
Then add Service: admin right open cmd switch to new Apache directory under execution:httpd-k install-n apache2.2_2
Second, Tomcat
Next is Tomcat, in addition to the normal cluster needs to change the port, but also need to change a place.
Note: The port number needs to be consistent here in the same group of machines. Otherwise, Tomcat cannot be associated with each other.
At this point, you can deploy two sets of load balancing (clusters) on the same computer.
Deploy multiple sets of Tomcat load balancers (or clusters) on the same computer