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.
You can follow along here to migrate the CA
Migrate Root CA to a new server
--please don't forget to
Accept as answer if the reply is helpful--
Do the step of importing DHCP and migrate of root CA done after or before i raise the domain and forest functional levels?
Either should be fine.
Thanks you Dave. This is the first time i doing the migration, so need to be quite cautious. stressful period.
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