The classes indicator/variable/key (whatever it's officially called) is only for classes.Then in the appropriate yaml file, specify:apache::mpm_module: falseor whatever. It's that easy.So your file should look like:classes:- apacheapache::mpm_module: falseapache::mod::prefork: trueapache::mod::php: thisapache::mod::rewrite: thatapache::mod::ssl: "the other"