When joining the domain you can get the following features:
- Logging in using using your Active Directory account.
- Offline login.
- When you browse to a network share using nautilus your credentials are automatically used. (You do not need to type your password again)
There are some prerequisites to make it work properly:
- Use a static IP address.
- Make sure your computer name (hostname) is resolvable by all AD server (That means you have to manually register your forward and reverse pointer on the DNS server)
- Make sure your time settings are correct. A clock skew of several minutes will cause login problems.
Once you have done this, start YaST and go to "Windows Domain Membership"
Enter your domain name (FQDN) and enable the 2 options.
To make it even better work, disable the earlyxdm service otherwise your login manager (GDM) will not always show your AD account because winbindd was not started yet.
And finally, I do not want to show my default domain when opening a terminal, so I add a setting to the [global] parameters in /etc/samba/smb.conf file:
winbind use default domain = yes
Reboot and you are done!