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DCpromo down a server and adding it back

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Last Modified: 2016-10-31
I am in the process of converting our servers to VmWare and don't want to risk migrating my Domain controllers.  I have several things pointed to the DNS of the IP of my DC'S.   I was wondering if it is okay to DCpromo down an existing DC, migrate it and then DCpromo the same machine back to a domain controller.  I would transfer all of the roles off before the process of bringing it down.    The server is 2008 R2.
Thank you.
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Sr. Systems Engineer
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Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
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Commented:
That is one method of doing it.

Why not create a new VM, and transfer the roles.
Tim LewisNetwork Manager

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I can minimize the DNS server downtime this way.    If I remove it as a DC but keep the DNS role I don't have to reconfigure anything on the network for the DNS being used.
Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
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do you not have two DNS servers at present ?
Tim LewisNetwork Manager

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We do.  I just figured this is easier than setting up a server, bringing down the current, changing the IP on the new one to match the old.   I am trying to avoid changing the DNS setting on the network cards of any devices that are not DHCP.
Andrew Hancock (VMware vExpert PRO / EE Fellow)VMware and Virtualization Consultant
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Commented:
if you have two DNS servers, clients, will use the second DNS server, if the first is not available.

so it does not matter, how long your first server is down for!
sAMAccountNameSr. Systems Engineer

Commented:
if you have two DNS servers, clients, will use the second DNS server, if the first is not available.

In theory, thats correct.  In practice however, some platforms dont behave that way.  Ubuntu for instance will latch onto a DNS server and hang on for dear life.  if that server goes down, it doesnt gracefully fail over to the next.  It *sorta* starts using the next in the list, but odd things happen with LDAP and other things until you clear the cache/restart the network daemon.
Tim LewisNetwork Manager

Author

Commented:
Worked Great.  All connect reestablished themselves after it came back online as a DC.  Just had to clear out some DNS entries that were left behind after demote.
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