Where is active directory snap-in for Server 2012 R2?
Solution 1:
It's right where it has always been. The Active Directory Schema mmc snap-in works the same way in 2012 R2 as it always has.
You have to install the Remote Server Administration tools first on any server on which you want to use these snap-ins. Server Manager -> Add Roles and Features -> Features:
[X] Remote Server Administration Tools RSAT Installed
...
[X] Role Administration Tools RSAT-Role-Tools Installed
[X] AD DS and AD LDS Tools RSAT-AD-Tools Installed
[X] Active Directory module for Windows ... RSAT-AD-PowerShell Installed
[X] AD DS Tools RSAT-ADDS Installed
[X] Active Directory Administrative ... RSAT-AD-AdminCenter Installed
-------------> [X] AD DS Snap-Ins and Command-Line ... RSAT-ADDS-Tools Installed
[ ] Server for NIS Tools [DEPRECATED] RSAT-NIS Available
[ ] AD LDS Snap-Ins and Command-Line Tools RSAT-ADLDS Available
Then run the command:
regsvr32 schmmgmt.dll
Then start an MMC console, and then add the AD Schema snap-in.
They make it a little more difficult to get to because you can easily do irreversible damage to your AD domain with it if you don't know what you're doing.