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Enter a password for the Directory Services Restore mode and click “Next”. I would recommend leaving it as the default. The Default First Site name should be selected for the site name unless you have created a new one. On the Domain Controller Options page, Domain Name System (DNS) server and Global Catalog (GC) should be checked. You will need to click the change button to enter in administrator credentials. Next, enter or select the existing domain you want to add the secondary domain controller to.

Select “Add a domain controller to an existing domain”. In the server manager click the yellow icon at the top and click “Promote this server to a domain controller”.Ģ. Promote this server to a domain controllerġ. When the installation is complete it will say “Configuration required. Nothing additional needs to be selected on this page.ħ. Select Active Directory Domain Services, you will get a popup to add features that are required for Active Directory Domain Services, click Add features.

Select “Role-based or featured-based installation and click next.Ĥ. Click “Next” on the Before you begin page.ģ. Open Server Manager & Install AD DS RoleĢ. Your domain can have weird issues if the date and time are off.

Date and Time – Make sure the time zone is correct.

You will not be able to join the server to the domain if this is not set.

IP settings – Set a static IP address on the server and make sure the DNS is pointing to an existing domain controller or DNS server.

Computer name – You want to set the computer name before promoting it to a domain controller.

Configure Basic Server Settingsīefore promoting the server to a secondary domain controller you need to make sure you have these settings configured. If you are using Windows Server 2012, 2016, or 2019 the steps to add a secondary domain controller is the same. Steps to Add a Secondary Domain Controller In this article, I will walk through the steps to add a second Domain Controller to an existing domain. A second DC will load balance the services and minimize the risk of critical services going down. To avoid this single point of failure you need to have a secondary Domain Controller. If the only Domain Controller goes down in the organization, big outages will occur resulting in a loss of operations.

Having one Domain Controller is not recommended because it creates a single point of failure.