[CentOS] CentOS 7, networkmangler, and hostname

I've a 7 box (actually, it's RHEL, but the general list there is
moribund), and I'm trying to configure it "correctly" so that it gets its
hostname from the DHCP server. All I've found so far is a script to use
from hooks of some kind. *Surely* there's just a configuration file option
somewhere....

          mark