Wants to upgrade Domain Controllers from Server 2008 R2 to Server 2012 R2


I have 3 domain controllers (Windows Server 2008 R2 with AD, DHCP, DNS) in my company, i want to upgrade all of them  to Windows Servers 2012 R2.

whats better to do and what is the best way to do this ?, a migrate ?
Idan DavidSystem AdministratorAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
You theoretically can do an in place upgrade directly to 2012R2 however, in-place upgrades are really not recommended. IMO i would suggest that you spin up new servers with 2012R2 and then migrate the FSMO roles and point DNS to the new DC's and then decommission the 2008R2 domain controllers.

It does involve more servers and a little more work, however it will be a smoother transition.

The probelm with in-place upgrades is that if something messes up durnig the process you are stuck. or if there are issues with the 2008R2 server originally they will be continue to 2012R2 and possibly not work properly.

It is always better to perform a clean installation especically when you are dealing with your DC's!

You cannot do an inplace upgrade without upgrading to 2012, first.
Luis MouraCommented:
Best way is doing new servers, and pass the roles, dhcp, DNS etc..

its simple, and Work ok
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Will SzymkowskiSenior Solution ArchitectCommented:
You cannot do an inplace upgrade without upgrading to 2012, first.

If you are 2008R2 you can install 2012 or 2012R2 on top of 2008R2 as an "in-place" upgrade.

However I would not recommend this method as I have stated in my first post.


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You can? And both will retain all settings? That's unusual, normally you lose settings if you skip one in between.
Is your situation is such, that all three serve unique functions?
I.e. Can you take one out of circulation, install new OS, join to domain, promote as another DC, setup DHCP, etc.?
Once the new DC is established, follow with the next.

Is the reason to transition to the new is that it is newer or do you have a specific purpose.
I.e. If this coincides with an upgrade cycle, get the new hardware and ....
Are you considering virtualization I.e. New server with sever 2012 hyper-v core with 4Vm to serve the functions you need DC/DNS/DHCP .......
Idan DavidSystem AdministratorAuthor Commented:
Thx for the fast solutions, after the installation of windows server 2012 r2 and migrate rules i need to do the DC promo process ?
Luis MouraCommented:
On the new server if you want a Domain controller, yes.
Idan DavidSystem AdministratorAuthor Commented:
I've requested that this question be deleted for the following reason:

Please explain what was solved and how it was solved? Did any of the comments help you arrive at the solution?
Will SzymkowskiSenior Solution ArchitectCommented:
What was the solution?

Luis MouraCommented:
At least share with other experts, and if the solution was good or not
Idan DavidSystem AdministratorAuthor Commented:
The solution was to create a new VM with Server 2012 R2 and transfer the FSMO rules step by step.

Works Perfect.
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Windows Server 2012

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