This article covers extending Azure Active Directory Domain Services (DCaaS) over to Azure Resource Model (ARM) virtual machine (VM). The article includes a video demo going over the process.
Video:
Steps in the above video covers;
Created a Virtual Network (VNet) in Azure Resource Model (ARM) portal
Setup Peering between Azure Resource Model (ARM) Virtual Network (VNet) and Azure Active Directory Domain Services (DCaaS) classic Virtual Network (VNet)
Updated DNS record for the Azure Resource Model (ARM) Virtual Network (VNet)
Created Virtual Machine (VM) and attach to Azure Resource Model (ARM) Virtual Network (VNet)
Joined ARM Virtual Machine (VM) to Azure Active Directory Domain Services (DCaaS)
Microsoft Azure article covering referencing steps in video