Upgrade Active Directory domain

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hello support,

below our ad environment:

root domain has upgrade windows server 2012

second domain dc has upgrade windows server 2008

the third level dc still in windows server 2003.

now need upgrade third level dc windows server 2012. there consider need know before upgrade process?

hi,

thanks post.

in opinion, could first add windows server 2012 domain controller existing windows server 2003 domain, migrate active directory windows server 2003 windows server 2012 complete upgrade process.

before begin, best check following prerequisites:

1. check if domain functional level setup @ least windows 2003 mode. lowest required domain functional level allow windows server 2012 domain controller installation.

2. run adprep /forestprep once on schema master prepare forest. perform procedure, must use account has membership in of following groups: schema admins, enterprise admins, , domain admins domain contains schema master. if procedure has completed in root domain of forest, can safely ignore it.

3. run adprep /domainprep once on infrastructure master in each domain in plan place windows server 2012–based domain controller.

you can refer document below:

upgrade domain controllers windows server 2012 r2 , windows server 2012

https://technet.microsoft.com/en-us/windows-server-docs/identity/ad-ds/deploy/upgrade-domain-controllers-to-windows-server-2012-r2-and-windows-server-2012

after processes above have been completed successfully, can set 2012 server , add existing domain domain controller. transfer fsmo roles new windows server 2012 dc(s).

for more detailed steps, may refer articles below:

step-by-step: adding windows server 2012 domain controller existing windows server 2003 network

https://blogs.technet.microsoft.com/canitpro/2013/05/05/step-by-step-adding-a-windows-server-2012-domain-controller-to-an-existing-windows-server-2003-network/

step-by-step: active directory migration windows server 2003 windows server 2012 r2

https://blogs.technet.microsoft.com/canitpro/2014/04/01/step-by-step-active-directory-migration-from-windows-server-2003-to-windows-server-2012-r2/

best regards,

alvin wang

please remember mark replies answers if , unmark them if provide no help.
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Windows Server  >  Directory Services



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