[Samba] Upgrade DC from 4.7 to 4.19

[Bjoern Trimborn]

Hi,

My Experience: Last year, I performed an "emergency" upgrade of 3 
domains, in a school district, from version 4.7 (self-compiled) to 4.18 
(Debian 12). By setting up a new Domain Controller (DC), joining to the 
domain, transferring all FSMO roles, and finally demoting the old one.

The upgrade went nearly flawlessly, except for one DC where I had to 
follow the "Demoting an Offline Domain Controller" procedure described 
in the wiki: https://wiki.samba.org/index.php/Demoting_a_Samba_AD_DC.

Am 18.05.2024 um 15:01 schrieb Hajdu Szabolcs via samba:
> Hello,
> 
> I have two Samba DCs currently on Ubuntu 18.04 LTS with Samba version 
> 4.7 I would like to move to Ubuntu 24.04 LTS with Samba version 4.19.
> 
> I don't want to do in place upgrade and iterate trough software versions 
> I think there is to many changes. I thought I demote one DC give all 
> FSMO rolls to the other do a clean install with the newer version then 
> rejoin the domain keeping the schema level Win2008 R2 until all servers 
> are upgraded. Can this method work? stepping down each server one by one 
> then rejoining with the newer Samba version with the same server name 
> plus changing the smb.conf file with new directives. I saw there are 
> major upgrades in Samba between 4.7 to 4.19 but it's not clear to me if 
> I do the above will it work will it break replication is there a chance 
> of data loss?
> 
> Thank You
> 
>