[Samba] Samba 4 two DCs no matching UID/GID

Rowland Penny rowlandpenny at googlemail.com
Tue Dec 9 15:03:44 MST 2014

On 09/12/14 21:07, Tim wrote:
> Hello all,
> I have a fresh install of two CentOS 7 machines. On DC1 I made a domain provision with --use-rfc2307. In DC2 I made a join as DC - both exactly as the wiki advised.
> In fact of its missing I added the idmap use rfc2307 yes parameter to smb.conf.
> I will have an extra share on both DCs.
> Today I realized, that wbinfo shows different UID/GID for the same users or groups on the DC's.
> I created the users/groups via RSAT. I don't have a Unix attributes tab in RSAT. Is that my problem for different uid/gid?
> Thanks in advance
> Tim

Hi, I think your problem is that idmap.ldb does not replicate to the new 
DC, this means that users get different UID's on the two DC's.

If you run:

ldbedit -e nano -H /var/lib/samba/private/idmap.ldb

on each DC, you will be able to see the differences.

The cure ? copy idmap.ldb from the first DC to any secondary DC's after 
the join.

It is documented here: 
https://wiki.samba.org/index.php/Join_a_domain_as_a_DC , near the bottom 
of the page.


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