What is LDAP?
The Lightweight Directory Access Protocol is the defacto industry standard application protocol for accessing and maintaining distributed directory information services over an Internet Protocol (IP) network.
There are a number of LDAP implementations - not just OpenLDAP - 389 Directory Server is one, Oracle Internet Directory, Apple OD are others, even Microsoft’s AD is based on LDAP.
389 Directory Server
Here, I will be documenting 389 Directory Server setup and implementation as the LDAP directory service.