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Demote DC procedure for 2012 RRS feed

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    I am migrating a Windows 2012 Standard server to a Windows Server 2012R2 Essentials server. I am at the point where I am ready to remove the W2012 Std DC and noticed that the demotion works a little different in 2012.

    When I demote the DC it still has DNS and AD services installed.  What should I do next? Is there a step by step or best practice? 

    Thanks.


    Monday, December 14, 2015 2:07 PM

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    This article describes the process. Please ask a specific question if you have anything further.

    Mike Crowley | MVP
    My Blog -- Baseline Technologies

    • Proposed as answer by Mike Crowley Monday, December 14, 2015 2:41 PM
    • Marked as answer by Mary Dong Friday, December 25, 2015 8:34 AM
    Monday, December 14, 2015 2:40 PM
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    Hi DigitalMan161,

    If the DNS server no longer serves any purpose after you remove AD DS, use Remove Roles Wizard to remove DNS server role. If you remove the DNS server role, you must reconfigure any DHCP scopes and DNS clients that resolved against this DNS server to use a suitable alternative . Make sure to update all of the domain clients to use the new DC for DNS.

    You may check about the articles below.

    https://technet.microsoft.com/en-us/library/hh472163.aspx?f=255&MSPPError=-2147217396

    Besides please note, if the original DC you're replacing is the only DC in the domain, then running DCPROMO on the original DC will transfer the FSMO roles to the new DC without the need to manually transfer them. If it's not the only DC in the domain, then DCPROMO will transfer the FSMO roles to another DC.

    Best Regards,

    Mary Dong

    Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Marked as answer by Mary Dong Friday, December 25, 2015 8:34 AM
    Tuesday, December 15, 2015 5:51 AM

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    This article describes the process. Please ask a specific question if you have anything further.

    Mike Crowley | MVP
    My Blog -- Baseline Technologies

    • Proposed as answer by Mike Crowley Monday, December 14, 2015 2:41 PM
    • Marked as answer by Mary Dong Friday, December 25, 2015 8:34 AM
    Monday, December 14, 2015 2:40 PM
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    OK, should I remove the DNS role from the old DC?  Does it matter?  If I am not mistaken but DNS is required on a Domain Controller therefore I can't remove it until the machine is demoted.  But once it is demoted can I just remove it from the domain and leave it at that?
    Monday, December 14, 2015 3:56 PM
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    Yes, I would uninstall DNS if you're no longer using it. It will no longer have access to the AD-integrated zones, but I suppose you could be hosting other zones locally.

    FYI: The DNS server role is not required on a domain controller.

    Mike Crowley | MVP
    My Blog -- Baseline Technologies

    Monday, December 14, 2015 5:23 PM
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    Oh and another question, when demoting a DC that has DNS should I point the Primary DNS of that DC to the new DC before demoting?  Or does it matter?
    Tuesday, December 15, 2015 12:02 AM
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    Hi DigitalMan161,

    If the DNS server no longer serves any purpose after you remove AD DS, use Remove Roles Wizard to remove DNS server role. If you remove the DNS server role, you must reconfigure any DHCP scopes and DNS clients that resolved against this DNS server to use a suitable alternative . Make sure to update all of the domain clients to use the new DC for DNS.

    You may check about the articles below.

    https://technet.microsoft.com/en-us/library/hh472163.aspx?f=255&MSPPError=-2147217396

    Besides please note, if the original DC you're replacing is the only DC in the domain, then running DCPROMO on the original DC will transfer the FSMO roles to the new DC without the need to manually transfer them. If it's not the only DC in the domain, then DCPROMO will transfer the FSMO roles to another DC.

    Best Regards,

    Mary Dong

    Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Marked as answer by Mary Dong Friday, December 25, 2015 8:34 AM
    Tuesday, December 15, 2015 5:51 AM