Still New to Samba 4 - Need to set up File Server - LDAP authentication

Thanks everyone who offered advise yesterday.

I'm running Samba 4 on Centos 7. The long term plan is to turn this into a file server. It will need to authenticate via LDAP. Specially, a MAC ldap.

I've found a lot of information about using PAM, etc. to connect a Samba file server to either a an Active Directory environment or an open Ldap environment, but nothing that will get it to authenticate to LDAP run on a OS X machine.