[CentOS] Samba active domain controller guide for Centos 7

Is there a good guide for setting up a Samba active domain controller?

I am currently running ClearOS, but it does more than what I want, even 
that I had to modify to suit my needs.  Only a few systems. Currently 
still XP, but I will migrate to Win7 with this move.

Of course I will be doing the install on a Cubietruck armv7.

thanks for any pointers.