Article: Join Linux to Active Directory with Winbind
"Samba and winbind provide authentication and identity resolution for Linux hosts that are part of an Active Directory domain, since Active Directory does not deign to provide a method for authenticating them directly. Follow the steps for joining a Samba server to AD. Then comes the hairy part -- if your Linux users require access to network services that require authentication, you'll have to configure PAM (pluggable authentication modules). This can be a bit vexing, but the advantage is it saves users from having to manage multiple logins. And it allows you to control access to services very precisely."
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