In this article, you are going to be introduced to the steps for migrating Active Directory from 2008R2 to 2012.
My environment is pretty small, [LAB ENV, which is empty, so this is going to be quick.
There are two machines > the first one isn’t DC 2008R2 + DNS and the second one is a new Windows Server 2012 machine
So let’s start.
First is adprep command
We have to prepare our forest so
Open on the old domain controller CMD and run
And now run:
configrem “C” letter
Please make sure yours is Functional Level Forest 2008R2
Now, we need to start with the Active Directory installation process on the new server
Add machine to the domain.
Check and verify there is communication between machine to the new to DC01
Add manually DNS IP’s on the new server
Open Add Roles and Feature Wizard and select Active Directory Domain Services
Open task and click on “Promote this Server a Domain Controller”
Do not forget to allow GC+DNS
Replicate from DC1.PELEGIT.COM
You can change the DB, Sysvol, Logfiles details :
The installation has now finished, Please perform Re-start
The next step is to start with moving FSMO steps,
On the domain controller, right-click and choose Operation Master
RID master = Change > Yes
PDC = Change > Yes
Infrastructure = Change > Yes
Go to the Active Directory Domains and Trusts
Right-click on Operations Masters…
Move the –Domain Naming Master to the new server
Domain naming = Change = Yes
The last role is schema,
In order to allow schema in MCC we have run this command : ( Allow DLL file ) regsvr32 .schmmgmt.dll
Open MMC > Snap-Ins > Schema
Change Active Directory Domain Controller…
We have to change directory to other DC:
Schema Master = Change = Yes
Netdom Query Fsmo
Great, now the steps left are to remove old server,
Make sure you already pointed all clients to communicate with the new DC before you removing DC
The first term to remove DC is the disallow global catalog on the old server
Active Directory Sites and Services > Server DC1 > Ntds Settings > Right click Properties
Uncheck GC > apply > ok
You can run dcpromo and uninstall the server,
But there is a last option to remove domain controller is run this command.
Eventually, we need to restart and shutdown the server.
Please try to uninstall the server correctly.
Make sure there is no leftover of the old server under ADSI. edit
Run DCDIAG command, DNS command just to make sure what’s the status. for Video you can watch this: