Steps necessary to decommission a DC from one domain and then add it as a DC to another domain
What are the complete steps to decommissioning a server from domain A (including removing DNS and site replication routes) and then adding it as a domain controller in Domain B? The documentation on the DC says that it does not hold any FSMO roles but what are the steps to confirm?
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what about the fact that its also a DNS server?
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membership
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You can confirm the FSMO roles the server holds by going through the instructions for transferring the FSMO roles, at http://support.microsoft.com/kb/324801. For each role, you can note the current role holder (just don't press the 'Change' button, and you won't make any changes).
You'd need to ensure you also have another Global Catalog DC somewhere on the network, and that you also have another DC running the DNS Service.
If all that is true, you can go to the DC you wish to move and run dcpromo. Follow the prompts to demote the server. This will drop it back to a Member Server, and should automatically delete any replication links and so on from the domain.
Then, you'll need to change the server's domain membership so it is a member of Domain B. You can then reboot, log in to the server (now on Domain B) and then re-run dcpromo, this time to promote the server as an additional DC.
-Matt