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Upgrading a domain controller
Upgrading a domain controller is a process that's the same for all versions of Windows Server operating systems from Windows Server 2008. You can do this in one of two ways:
- Upgrade the operating system on existing domain controllers in place.
- Carry out a clean install and migrate to Windows Server 2016 as a new domain controller in the domain.
I personally prefer the second method, because when you finish, you will have a clean installation. The DNS records and AD DS database will be replicated on a new server.
If you want to upgrade the domain and the forest functional level in the running domain to Windows Server 2016, all your domain controllers must be Windows Server 2016.