How-To : Promote Windows Server 2012 Core to first Domain Controller in Forest
In order to create new Forest and promote Windows Server 2012 Core to be Domain Controller for that Forest, first Active Directory Services Role has to be added:
Install-WindowsFeature AD-Domain-Services –IncludeManagementTools
Once Active Directory DOmain Services role is installed we can promote server to be first Domain Controller in the Forest.
Install-ADDSForest -DomainName "lab.corp" -DomainNetbiosName "LAB" -DomainMode Win2008R2 -ForestMode Win2008R2 -InstallDns -Force
And after some time new Forest and Domain Controller is ready to use.