[Samba] Migrate and Update (Samba 4.1 ADDC to Samba Latest Version on different Server).

[Juan Ignacio]

Hello friends, I have not asked anything around here for a long time. But
the time has come ... I must update the samba 4.1 server that I have in
production for 8 years.

Sorry Rowland for send the email to you i dont know if the samba list is
getting my emails.

 Unfortunately I can't turn off the server or shut it down for a while
because I have several things that depend on it so I built a VM with the
latest version of Debian that is already ready to compile and install the
latest version of Samba.

I started by reading the following info.
https://wiki.samba.org/index.php/Updating_Samba#The_Update_Process

https://wiki.samba.org/index.php/Back_up_and_Restoring_a_Samba_AD_DC#So_which_backup_should_I_use.3F

But I realized that the backups of my server are made with the information
from the following script.
https://wiki.samba.org/index.php/Using_the_samba_backup_script

When I started to move the backups to the new server in the VM I read the
following and did not know how to continue. "Very important notes: Never do
a restore and a version change at the same time! Always restore on a system
using the same Samba version as the one you created the backup on! Always
Restore on a system with the same IP and Hostname. Otherwise you will run
into Kerberos and DNS issues. Recommended: Restore on the same OS as you
created the backup on. The most important thing in a restore situation is
to bring your system back to a running state. Once everything is up and
tested, you can then do any required changes.”

“Never try to make changes together with a restore! “

Then I realized that I couldn't do what I was doing.

I would like to know what is the best way to do what I want without messing
it up too much or without affecting my current configuration.

Some important information.
Old Server: Machine Server.
OS: Debian 3.2.63-2 + deb7u1
Samba V: Version 4.1.0
Samba Provision: Samba AD DC.
State: Production
Backups: samba-backup script.
Members DC: 3
Using Samba Ldap for Web Apps authentications.
Using Wbind
Users: Around 1000

New Server: VM Server.
OS: Debian 10.10

Samba V: Version 4.16 Latest Version Samba

Provision needed: Samba AD DC.
State: Inactive, Testing Phase, RDY Backups.
Backups: VM backups if required.
Member DC: 3
Using Samba Ldap for Web Apps authentications.
Using Wbind

Users: Around 1000

Any help on how to start the process I appreciate.

Greetings.