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Server Migration

Posted on 2013-11-18
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Last Modified: 2013-12-13
Hello,

We have 2008 server standard edition, working as domain controller. We added 2012 server as a additional domain controller. Now we want to remove 2008 server and make 2012 server as a primary domain controller with no downtime.

Please give proper step by step instructions to achieve the same.

Thanks
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Question by:Tsicinc
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Expert Comment

by:Mahesh
ID: 39656283
Please follow below steps

Move all FSMO roles from 2008 to Windows server 2012 with commadline NTDSutil tool or GUI
http://yadhutony.blogspot.in/2012/10/step-by-step-guide-to-transfer-fsmo.html

Move your NTP server configuration from 2003 DC to 2012 DC
http://support.microsoft.com/kb/816042

Note down any standard primary zones on windows 2003 and create them on windows 2012
If you have DHCP server, then change primary DNS ip to windows 2012 in DHCP scopes.
For all member servers, computers and network devices who are using static IP addresses, change primary DNS server to Windows 2012
Point preferred DNS IP on 2008 server to windows 2012 server.
Reboot the windos 2008 DC once and check if replication and name resolution between both DCs is proper
Then use dcpromo to demote the server to member server gracefully
Once demoted, go to active directory sites and services and remove server object from NTDS site settings

If you failed to demote server gracefully, then demote it forcefully with below command
dcpromo /forceremoval
This commad will remove DC forcefully from AD but you still need to cleanup server metadata from AD
http://technet.microsoft.com/en-us/library/cc816907(v=ws.10).aspx

Thanks
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Author Comment

by:Tsicinc
ID: 39656291
can you please give link with snapshot where it explained step by step? Also if we transfer the roles and demote server later on will everything work as it is without affecting anything? OR we need to put new server address in dns list of all clients first?
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Expert Comment

by:Mahesh
ID: 39656315
You can transfer fsmo roles to windows 2012 server and later on you can demote 2008 demote controller whenever you want.
You need to put 2012 server address as preferred DNS on all client computers and servers and network devices prior to demote the 2008 server.
Check below article for step by step
http://www.vmadmin.co.uk/microsoft/43-winserver2008/136-svr2008dcdemote
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Author Comment

by:Tsicinc
ID: 39656322
if we just transfer the roles to new server do we still need to put new server address in dns list of clients?

Also what about the dns server on new server. will it replicate automatically or do we need to create manually. Please give proper steps if possible.
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Expert Comment

by:Mahesh
ID: 39656356
You need to put 2012 server address as preferred DNS on all client computers and servers and network devices prior to demote the 2008 server.

You said that 2012 Domain Controller is already deployed.
If thats the case, your all ad integraded dns zones and all directory partitions must be already replicated to 2012 server
So, why you want to create dns manually ?
What i suggested in 1st post is, you need to create any standard priamry zones on windows 2012 if they are exists on windows 2008 server.
bacause after demotion of 2008 those zones cannot be used.

Do one thing.
Connect to DNS console on both servers and check if you have same zones exists on both servers.
If any extra zone (Standard primary) you found on windows 2008 server, then just change it to AD integraded so that it will be automatically created on 2012 server or manually create that zone on 2012 server.

Do you have any domain \ forest trust with other active directory forests, let me know please.
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Author Comment

by:Tsicinc
ID: 39656757
I understand if we demote the dc then dns should be pointed to new dc that's fine.

My question is if we first transfer the roles to ADC and then we will demote the other dc after 4-5 days. then during that period do we need to change dns still? just after transferring roles?

we don't have any other dns zones so its fine we will leave this as it is.

No only two servers are there one DC and other ADC that just recently created.
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Accepted Solution

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Mahesh earned 500 total points
ID: 39656911
Your question:
My question is if we first transfer the roles to ADC and then we will demote the other dc after 4-5 days. then during that period do we need to change dns still? just after transferring roles?

No, its not required.
Only You need to make ensure that before starting 2008 server demotion, DNS pointers should be pointed to windows 2012 server.
Thanks
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