iApp template help required

If i understand your request correctly, you want to create single VIP with nodes including dev, QA and prod enviornments.

if yes, the template Local-f5.http iAPP might help.

-Jinshu

If your requirement is to create a VIP and redirect the traffic based on the hostname, below irule might help you.

Create VIP and associate irule in there.

when HTTP_REQUEST {

    if { ([string tolower [HTTP::host]] equals "abc1.abc.com") } {
        pool qa_pool
    } 
    if { ([string tolower [HTTP::host]] equals "abc2.abc.com") } {
        pool dev_pool
    } else {
        pool prod_pool
 }
 }

-Jinshu

Multiple pools are handled from 1 virtual using an irule in the f5.microsoft_exchange_2013_cas iApp. If you want to use that code for reference, look for "combined_pool_irule".