MediaWiki requires a bit of tech savvy--setup, themes, maintenance. If you're looking for something that you can just kind of run with out of the box, you might consider wikidot instead. It doesn't have all the same bells and whistles, but it's free, easy to use, and serviceable.

Digital Ocean has a setup guide for MW: https://www.digitalocean.com/community/tutorials/how-to-install-mediawiki-on-ubuntu-14-04

Fucking awesome.

Updated this for two reasons.

Different wiki installs have different prefixes. Allowed easily changing the prefix from 'wiki_' to whatever.

The latest versions of MediaWiki messed up the ability to do case-insensitive page_title searches from the Mu*. Fixed that.

Enjoy.

Lemme know how it works out for you, but-- doing new things for new games, I'd recommend starting to consider other options. MediaWiki is a gargantuan and moderately filthy PHP app. Less awful than forums, but it is what it is.

Just as this forum software seems to be a better alternative to phpBB/SMF, there might well be (or should be) some shiny node.js based wiki system. Doing it with that would allow for future integration with node.js based MUservers, if such a thing ever comes to pass.