Question: how to change domain controller name on server 2012 r2?
Answer: Step 1: Getting ready. Open a command prompt. ( ... 
Step 2: Adding an alternate computer name. ... 
Step 3: Make the new name the primary. ... 
Step 4: Reboot the server. ... 
Step 5: Check new server name. ... 
Step 6: Remove old hostname. ... 
Step 7: Paranoia. ... 
Step 8: Clean up.