My brother is an organic farmer.
I'm a digital farmer.
There is no official way of creating a wiki farm. But there are many wiki farms. And there are people working on standardizing and improving how wiki farming works.
Also, Cindy Cicalese steps through her expert setup at https://collaborate.mitre.org/gestalt/index.php/The_Why_And_How_of_Wiki_Farms Code for automating this with Ansible is at https://github.com/wikimedia/mediawiki-tools-ansible-wikifarm