In this blog post we will be learning on how to install Windows Server 2012 Domain Controller in an Existing Active Directory environment.
Active Directory Preparation is a mandatory task before we introduce any latest version of Windows Server. For example if we are running Windows Server 2008 R2 and we want to introduce Windows Server 2012 then we have to Prepare the forest and the domain so that we can promote Windows Server 2012 as a domain controller.
Estimated Time : 30 Minutes
Before We Begin
The account with which we are going to perform this task should be a member of Schema Admins Group and Enterprise Admins Group.
Windows Server 2012 should be a domain joined machine for easy upgrade.
Domain Controller : DC1.MSEXCHANGETEAM.IN
Forest Functional Level : Windows Server 2008 R2
Domain Functional Level : Windows Server 2008 R2
Open Adsiedit to check what is the current forest udpate.
Figure 1.1 : ActiveDirectoryUpdate
Right click ActiveDirectoryUPdate and select properties.
Figure 1.2 : Revision 5 for ActiveDirectoryUpdate
In figure 1.2 the revision is showing as number 5 which is for Windows Server 2008 R2. Post upgrading the forest we will check revision.
Figure 1.3 : adprep /forestprep
In figure 1.3 we have run the command from ‘Windows Server 2012 Media. The location is \Support\adprep. Run the command as shown above.
Figure 1.4 : Schema Version
In figure 1.4 it says Current Schema version is 47 and Upgrading Schema to Version 56. This schema files are available inside Adprep folder.
Figure 1.5 : Command Completed Successfully
Figure 1.6 : DomainPrep
How to confirm if Forest Prep and Domain Prep has completed successfully.
Go to the same location as shown in figure 1.1 and select propeties. You should see the below revision as shown below.
Figure 1.7 : Forest Prep has completed and the version has changed.
Now lets check the domain prep.
Open Adsiedit and connect to the default naming context as shown below.
Figure 1.7 : Default Naming Context
Figure 1.8 : Right Click Active Directory Update as shown above and select properties.
Figure 1.8 : Domain Prep update.
Active Directory has been prepared for Windows Server 2012 Domain Controllers. We can introduce Windows Server 2012 DC whenever required.
In this blog we have learnt how to prepare and extend schema to support latest version of Windows Server 2012.
In next part we will be learning how to install Additional 2012 Domain Controller in an existing environment.
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