Remove DNS from demoted domain controller

[Stuart_C]

Hi all,

so I've spent the last few days migrating my DC's to new 2k8 R2 servers and demoting my old ones. Everyting looks alright, all the roles are migrated across to the new servers and they are now running AD and DNS. My problem is that the old servers still seem to be running (my AD integrated) DNS.

 

Does anyone have any advice about stopping them doing that? i.e can I just stop the DNS service on them? IS there anything else I need to do or look out for?

[timzim]

I presume you've DNS on your new servers. If you're using DHCP to assign IPs make sure it's been updated to point your clients to the new DNS servers.

 

Maybe stop the DNS servers on your old machines and leave it a few days before removing the service from them. That way you can then check appropriate logs for any DNS errors and turn them back on again if there are major problems.

[Stuart_C]

I presume you've DNS on your new servers. If you're using DHCP to assign IPs make sure it's been updated to point your clients to the new DNS servers.

.

 

Yep. All OK as far as I can tell.

 

Maybe stop the DNS servers on your old machines and leave it a few days before removing the service from them. That way you can then check appropriate logs for any DNS errors and turn them back on again if there are major problems.

 

Would you just go into "Manage server" and remove the role? Is there anything else I need to be looking out for or a differnet way of doing things?

[DMcCoy]

You may also need to check the dns zone properties on the remaining server and remove the old server from the name servers list.

[timzim]

If you've got any fixed IP addresses on the network make sure you've updated the primary DNS on each of these before you remove the old one.