For whoever searched for “can’t login root on YellowDog”, ummm, sorry. If you forget the root password, you’re pretty much hosed. You hopefully set yourself up as a normal user and you remember that password. Even so, you’ll never be able to install another RPM or setup any new services. Yeah, you’re in a world of trouble. The only way to get the root password is to set a new one, and the only way to do that is to start aaa-aaaaaall over by reinstalling.