[Samba] join linux client to samba domain

[Leandro Tracchia]

i'm trying to do something which i thought would be simple but i am
having a hard time finding information on this. i already have a samba
pdc running and managing 17 windows xp clients. i have one linux
client that i need to join to the domain. i don't want this client to
share anything, i just want it to be on the domain. what does my
smb.conf file need to look like??