Dear Thomas, Zico,
Thank you very much .
It seems that we don't have existing userbase in any Active Directory or LDAP .
So, I am thinking about this approach :
1. Keep the current database in DBMS
2. Create an API from the current website that handle user registration and checking password.
3. Use Gluu for authenticating to the user and registration.
4. For User registration, I will call to my API for verification and registration after the registration process is working well on Gluu.
5. For User login , I will use Gluu to do authentication just like the passport_social script to Add / Update user information that I get from the API .
Sound like a plan ?
Do you have any more suggestion .
Thank you