Configuring Active Directory users authentication on Cent-OS boxes using LDAP

Hello,

I am trying to authenticate AD users on Cent-OS box.I have installed AD on my test machine. From Cent-OS, I can do ldapsearch on that.

However when I try to authenticate using users it gives error as user does not exist. I want to use LDAP for both authentication and retrieving metadata for users.

Is there any step by step instructions available to do this.