Windows Server 2025 has been released.
To take advantage of the new OS, I'll upgrade the AD Domain Controllers DC01 and DC02 to Windows Server 2025.
In a real-world environment, many factors would need to be considered, but since this is a test environment, I will only cover the basic upgrade process.
The Windows Server 2025 installation image created earlier using Sysprep was utilized.
Test Environment
The process was carried out in the following steps:
1. DC02: Windows Server 2022 Demote
2. DC02: Windows Server 2025 Promote
3. Change the Master role to DC02.
4. DC01: Windows Server 2022 Demote
5. DC01: Windows Server 2025 Promote
6. Change the Master role back to DC01.
Step 1. Remove DC02
Add roles and features
Start the Remove Roles and Features Wizard
Next
Next
Active Directory Domain Services
Remove Features
Demote this domain controller
Next
Proceed with removal -> Next
Next
Next
Demote
Close
Close
Verify that the Domain Controller (DC) has been successfully removed.
After rebooting, proceed with removing the roles again.
Switch the machine to WORKGROUP mode.
Remove DC02 from Active Directory Users and Computers (ADUC).
Yes
Step 2. Install the Domain Controller (DC) role on Windows Server 2025.
Proceed with joining the server to the Active Directory (AD).
Server Manager -> Add roles and features
Next
Next
Next
Active Directory Domain Services
Add Features
Next
Next
Next
Install
Promote this server to a domain controller
Add a domain controller to an existing domain -> Next
Enter the Password and click Next.
Next
Next
Next
Next
Next
Install
Once completed, the system will reboot.
Enter the following command to change the DC Master role to DC02:
Move-ADDirectoryServerOperationMasterRole -Identity DC02 -OperationMasterRole SchemaMaster, DomainNamingMaster, PDCEmulator, RIDMaster, InfrastructureMaster
Netdom query fsmo
Step 3. Remove DC01
Update the DNS Address to point to DC02.
Server Manager -> Add roles and features
Start the Remove Roles and Features Wizard
Next
Active Directory Domain Services
Remove Features
Demote this domain controller
Next
Proceed with removal -> Next
Next
Enter the Password and click Next.
Demote
Close
After rebooting, navigate back to the Roles and Features removal menu and proceed with the Active Directory Domain Services (AD DS) removal process.
Click Close and proceed with the system reboot.
Switch the machine to Workgroup mode.
Remove DC01 from Active Directory Users and Computers (ADUC).
Step 4.. Install DC01
On the new VM for DC01, configure the IP address and set the DNS server to DC02.
Domain Join
Add Roles and features
Next
Next
Next
Active Directory Domain Services -> Next
Promote this server to a domain controller
Next
Enter the Password and click Next.
Next
Next
Next
Next
Install
Click Close, and the system will reboot.
Set DC01 as the Primary DNS and DC02 as the Alternate DNS.
S and DC02 as the Alternate DNS.
Run the following command to change the Master role back to DC01:
Move-ADDirectoryServerOperationMasterRole -Identity DC01 -OperationMasterRole SchemaMaster, DomainNamingMaster, PDCEmulator, RIDMaster, InfrastructureMaster
Netdom query fsmo
Step 5. Raise Forest Functional Level
Active Directory Domains and Trusts
In Active Directory Domains and Trusts, right-click and select Raise Forest Functional Level to upgrade the forest functional level.
Raise
OK
Use the following command to verify the current functional level:
Get-ADDomain |fl name, DomainMode
Get-ADForest |fl Name, ForestMode
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