I have installed Server 2012 R2.. This server is replacing an Old Primary DC that no longer works.. Currently working off the secondary server.. This server role will be DNS, DHCP and AD… I have added the roles, assigned IP… Just need some assistance to complete configurations so I can put into production..
From what I understand, you need to:
Join server to current domain
Add ADDS role and promote to DC (DNS will be an option to add, and functional levels now update as part of the process)
Install DHCP role and configure scope
Test, Test, TEST
Retire old DC
Metadata cleanup to remove failed DC