Upgrading Domain Controller to Server 2012

We are upgrading the hardware of our Domain Controller which is Server 2008 (not R2).  We only have one DC in our domain.  What I plan to do is this...

-Install Server 2012 on new server
-Promote new server running Server 2012 to Domain Controller
-Demote old domain controller on Server 2008

Would this be the right sequence?  Will there be an issue going from Active Directory 2008 to 2012?  Anything I need to be aware of?  Do I first need to migrate AD to 2012?
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bpl5000Asked:
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ZenVenkyConnect With a Mentor ArchitectCommented:
Yes, you are doing it right way. Agree with other experts, however let me tell you how you shall complete it.

1. Install 2012 on a machine and make it member server.
2. change the DNS pointings over NIC  and make sure it is pointing to 2008 DC.
3. Now Run DCDiag in verbose mode and check the AD health on 2008DC, fix them if you see any tests failed.
4. Promote 2012 as DC to the domain, this process will tak care of schema update (you shall have domain and enterprise admin permissions to do it).
5. Wait for replication to happen (atleast 2 hours).
6. If everything is fine, then transfer FSMO roles to 2012DC.
7. Change DNS pointings and make preferred DNS as itslef.
8. Make 2012DC as authoritative Time Server as Sarang mentioned.
9. Again wait for atleast 3 hours to check DC's health as your's a single DC environment.
10. If everything is fine, then demote 2008DC.
11. You can do itfrom ADUC, just select 2008DC and delete this will complete the metadata cleanup.
12. Go to sites and service and delete 2008DC's entries.
13. In DNS console delete 2008DC's entries.
14. Take complete backup of 2012DC using Windows Server Backup (SystemState).
15. You are DONE.

Reference:

DNS Best Practices

Authoritative Time Server
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uescompConnect With a Mentor Commented:
In short, yes.

Join the 2012 server, make sure to delegate all the FSMO roles, promote the new 2012 and demote the 2008.
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Brad BouchardConnect With a Mentor Information Systems Security OfficerCommented:
Your steps you described are in perfect order.

You will first:

1)  Create your new 2012 server and get it up-to-date but don't promote it yet (technically you can't)
2)  You no longer need to run adprep on another DC from the 2012 folder that is on the CD/ISO because 2012 preps things for you.
3)  Add AD DS role to your 2012 server
4)  Run DCPROMO or promot this server to a DC from the Server Manager

Once you're done, transfer all FSMO roles to your new DC.
http://www.petri.co.il/transferring_fsmo_roles.htm

After that, decomission your old DC by running DCPROMO on it.  Removing DNS will happen on it too at this time.

You should be good to go, however remember to go manually update any statically set IP addresses with the new information and update your DHCP server with the new server name/IP.
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Sarang TinguriaConnect With a Mentor Sr EngineerCommented:
A tiny but important thing is to configure new 2012 server as a authoritative domain controller

Follow below article applies to 2012 also

http://www.experts-exchange.com/Software/Server_Software/File_Servers/Active_Directory/A_10789-Time-Service-Configuration.html
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bpl5000Author Commented:
I should have asked this before, but will there be any downtime?
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Brad BouchardInformation Systems Security OfficerCommented:
Not if you do it right.
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