This is a quick post on how to promote your Windows 2019 Server to Read Only domain controller on an established domain
Firstly build your Windows 2019 Server, give it an IP and make sure it has connectivity back to the rest of the domain. Run the usual health checks i.e. dcdiag, replmon etc.
Open Server Manager and click Manage> Add Role and Features
Select Active Directory Domain Services and click Next
Cick Add Features to include all the necessary tools
Select Group Policy Management and click Next
Click Next
Click Install
Allow the installation to finish
Once finished click Promote this server to a domain controller
Click Add a domain controller to an existing domain
Select all three options including Read only domain controller. Enter a DSRM password.
Accept the default allowed password replication group
Click Next
Click Next
Click Next
Click Next
Click Install
Allow the install to finish
You will see the domain controller appear in ADUC
Configure DNS to respond on the correct IP
If this is your first Active Directory 2019 deployment and you are still using FRS you will see this error. I will be doing another post on how to fix this.
