Step by step to upgrade win2012r2 AD to Win2019

Question

I had 3 DC which are under Win2k12R2, May i know the step by step method to migrate the this 3 DC in the new Win2k19 AD VM? The DC also holding DNS and DHCP function, at which steps should we migrate? Existing certificate migration when do we migrate? Any need to upgrade the schema?

Answer 1

The two prerequisites to introducing the first 2019 or 2022 domain controller are that domain functional level needs to be 2008 or higher and older sysvol FRS replication needs to have been migrated to DFSR

I'd use dcdiag / repadmin tools to verify health correcting all errors found before starting any operations. Then stand up the new 2019 or 2022, patch it fully, license it, join existing domain, add active directory domain services, promote it also making it a GC (recommended), transfer FSMO roles over (optional), transfer pdc emulator role (optional), use dcdiag / repadmin tools to again verify health, when all is good you can move on to next one.

You can export / import the DHCP server scopes.

Export-DhcpServer
Import-DhcpServer

You can follow along here to migrate the CA

Migrate Root CA to a new server

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