RHEL7 Use Active Directory for authentication only

Hello,

I'm looking for a way to make my rhel7 server use the Windows' Active Directory for authentication purpose ONLY.
I already have my user defined in the /etc/passwd and /etc/group files.
So they have their own uid/gid for the rhel7 server.

If anyone has a step by step or an idea on how to accomplish this...
it will be greatly appreciated!

Thank you very much