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Install new domain controller

Posted on 2013-06-09
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I have an existing windows 2003 domain controller.   Can I install a new windows 2012 domain box and then promote it as the main controller?   If so, how do I do that?
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Question by:al4629740
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by:Randy Downs
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by:ded_ch
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You will have to make sure that the Domain is actually in the 2003 mode. If it is, you can install a windows 2012 server, add the active directory role and the run the promotion wizard.
Join the new Server as an additional domain controller.
After the server has finished replicating, you can then simply demote the windows 2003 server.
I would recommend you always run two Domain controllers for redundancy.

Here is some reading material: http://technet.microsoft.com/en-us/library/hh994618.aspx
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by:VirastaR
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Hi,

Check this
http://technet.microsoft.com/library/hh472162.aspx

Hope that helps :)
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by:al4629740
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How do I run two domain controllers for redundancy?
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Running two Domain controller adds redundancy by replicating the Active Directory between these two DC's. This happens automatically for Domain Controllers in the same domain.

Despite the best Backup, Domain Controllers are very fickle to restore from Backup. So if your Backup fails to restore and you only have one DC, your Domain is lost.
If you run two Domain Controllers, and one fails, the other still has all the information needed for the Domain to keep running and clients will automatically authenticate against this second Domain Controller. Simply reinstall your lost domain controller and you have redundancy back.
The second Domain Controller could even be a small workstation, if you are worried about costs.

The only difference between Domain Controllers are the FSMO Roles.
These hold special functions in a Domain and are usually only run on one DC per Domain/Forest.
If you loose one of the FSMO Holders, there are ways to seize the role from another DC.
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