samba - Oct 2014 - Join an ADS Domain and provide simple password security

Hi,

I'm used to share some files and trees with samba from linux boxes, using
simple password security for a few selected accounts, by using `smbpasswd` and
`security=user`. Now I sometimes want to enter a domain in my company office
network.

But I could not use `net ads join` as long as I haven't changed
`security=user` to `security=ads`.

I'm a bit confused now:

I joined a domain with security=ads and started winbindd with this setting. Now
I moved my samba configuration back to `security=user` so I can use my local
user accounts.

Still winbind echoes the domain users and smbtree shows the domain hosts, but
the share server now works in another domain, that is local to the system it
runs on.

Is this configuration valid, or will it fail?

What is the idea of joining a domain anyway?

Can I join an ads domain with the linux host and provide 'security =
user' shares on the same machine? If yes, how?

Regards,

Ingo Krabbe