[Samba] Upgrade DC from 4.7 to 4.19

[Peter Milesson]

Hi Hajdu,

I have upgraded a few domains the way you want to go. I have also 
upgraded an existing DC, once. Lots of hazzle, not worth the trouble. 
It's a snap to create VMs, configure the new DCs, sync them with the 
existing ones, migrate the FSMO roles to one of the new DCs, and then 
demote the old DCs. But I don't think it's a good idea to keep the names 
of the old DCs. You're probably in for a few surprises in that case.

If you haven't a really huge network with lots of machines with static 
IPs, it should be quite painless to change /etc/resolv.conf on Linux 
members, and update the adapter settings on Windows servers that have 
got static addresses. Changing DNS addresses in a DHCP server should be 
trivial.

Just my opinion, I wish you good luck.

Peter


On 18.05.2024 15:01, Hajdu Szabolcs via samba wrote:
> 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
>
>