Setting a domain name

Hi Everyone, I just want to pre-emptively thank everyone for all your help. I've been a long time user of crux for non-domain style servers (file server, personal web server, etc), but now I would like to assign a domain name to my system. I have the domain registered already, and the DNS is set up and I can access the domain and it goes to my system fine, but when I do `domainname` it returns `(none)`. I'm accustomed to slackware's netconfig for managing the domain name on a server and I just can't seem to find a proper document or anything to show me how to do this manually. I know this is a silly question, but I just can't seem to figure it out!