[Samba] Migration of 2 samba3 PDC+OpenLDAP in one new Samba4 AD

Denis Cardon denis.cardon at tranquil-it-systems.fr
Thu Apr 9 07:37:33 MDT 2015

Hi Marc,

> Am 08.04.2015 um 17:25 schrieb BRIEC, Pierre:
>> On Site1, the machines accounts are specifics, same for the Users and
>> Groups except 1 group that is common with Site2 (The Teachers).
>> Today, each site is independant,
>> Now, i would like a create a new domain Samba4 AD whith all machines and
>> users from site1 and site2 together.
>> Then, i would make a replication between the two sites, and add one RODC
>> server on each site
> RODC support isn't completely working yet. You shouldn't use it atm.

could you please develop on that RODC support? I am very curious to know 
what should be working and what should not.

Actually I've been using RODC with partial success: RODC join, user and 
machine account preload (with corresponding patch), dns update throught 
netlogon service on RWDC, connexion when RWDC is disconnected. It has 
been running in production in our datacenter for webapp authentication 
for months, albeit with some hicups. I has never been completly fine 
from a stability and reproductibility point of view, and I switched it 
back to RWDC earlier this week....



>> How can i proceed? The migration tool from samba3 is working fine on each
>> site (tested on isolated network)
>> Can someone give me some hints about this. I would be happy if the
>> migration could be transparent for the machines account, as 90% of the
>> Users are deleted in July (i'm IT manager in a school)
> AD trust are currently not fully implemented. If they were, then you
> chould do the classicupgrade on both domains, create a trust, move
> everything into one domain and demote the other.
> Because you can't do it that way, you could upgrade the domain which has
> more objects (user, machines, groups) and join the workstations from the
> other site to it and recreate the users. You can write a script to
> export the users on the second site and create them with samba-tool.
> What kind of IDmapping are you using on the member servers in the
> domains? If the member servers are pulling the UIDs/GIDs from LDAP and
> the ID ranges don't overlap with the other domain, then you could really
> recreate the users with a script running over an export. This prevents
> you from loosing ownership on files.
> For more details/ideas, you have to give some more information about the
> two backends.
> Regards,
> Marc

Denis Cardon
Tranquil IT Systems
Les Espaces Jules Verne, bâtiment A
12 avenue Jules Verne
44230 Saint Sébastien sur Loire
tel : +33 (0)

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