[Samba] Questions on this upgrade scenario

[James Johnson]

Hello!

I've encountered a CentOS 6.10 server running Samba 4.1.0 compiled from
source running as a Domain Controller in a small office. It's being used
for some basic AD functionality and sharing folders to a half dozen Windows
desktops on the local network and everything seems to be running fine. I'd
like to modernize that setup with Ubuntu 22.04 LTS running the latest and
greatest Samba 4.19.X from repo but I'm not sure what the least terrible
option is in my case.

   - Backup and Upgrade Samba 4.1.0 to whatever the latest is that I can on
   CentOS 6.10, join the Ubuntu server as a DC with that Samba same version,
   demote/retire the CentOS server then upgrade Samba on Ubuntu to the latest
   and greatest?
   - Backup CentOS Samba 4.1.0 files, setup Ubuntu server with Samba 4.1
   from repo, restore CentOS Samba 4.1.0 files to new Ubuntu Samba 4.1.0
   server and then upgrade to latest Samba? Basically would be recovering it
   there like a DR exercise with the Ubuntu server having the same name, same
   IP, etc?
   - Create everything new on the Ubuntu server w/ a new Domain and join
   all the workstations there?
   - Other less terrible options that could work?

Thanks!

Jim