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sagdoc
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Can I install a Windows 2019 server as a domain controller before I run Adprep

I currently have a AD domain at forest and domain functional levels at 2016.  I have been reading up on Windows server 2019 but there is one thing I am not sure of.  Can I promote a 2019 server as a DC in a 2016 level domain without needing to run the normal ADPrep utilities and pre-req's (this includes running the utilities automatically during install).  There does not seem to be any real differences between 2016 and 2019 that I have seen but I want to make sure before I try.  

Thanks
Windows Server 2019* Azure Active Directory Domain Services

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arnold

8/22/2022 - Mon
Lee W, MVP

There were no real changes between 2016 and 2019 so there is no "2019 Functional level".  

That said, when you promote a DC, any schema changes required by that OS *MUST* be made.  However, if you don't promote the domain or forest functional levels, they won't be used.  
The act of promoting recent generations of Windows Server WILL automatically run ADPREP when necessary.  You cannot stop that or skip it if you want a DC running a newer version of Windows than your existing DCs, but likewise, doing so (alone, without raising functional levels) should have NO EFFECT on the other DCs.
arnold

Lee addressed a portion of the question.

Not quite sure what the concern is.
You can try, if it needs to be run, it will either load it, or it will tell you that you need to run adprep.

What is the concern with running adprep from the w2019 iso?

Out of habit, in the source tun adprep on the current DC. it either has all that it needs, or it will load what is missing.
sagdoc

ASKER
I don't have any real concern, I was just curious what others experienced.  Mostly because like what was said above, there is no real difference between the two.
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arnold

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