[Samba] Linux machine to join Samba Domain

[vikas]

hi.. all...

can some one help me understanding how to add linux (mostly ubuntu,suse 
etc)

what exactly i am looking for is what one should do on linux machine 
like editing /etc/nssswitch.conf, pam related file etc..but i dont find 
any standard way where one can add any linux machine to samba domain


my goal is to just get authenticate through Samba

Windows machine are successful getting connected to samba with all 
policy working like USB disable through regedit, disable drives etc.

Samba version = 4.1.5
Os= centos 6.3 64bit
samba= AD DC

regards,
vikas