Virtualizing Microsoft Active Directory Domain Controller servers is a topic that has been gaining traction in recent years, and for good reason. With the benefits of virtualization, such as improved scalability, flexibility, and cost savings, it’s no wonder that many organizations are considering virtualizing their Domain Controllers. However, before we dive into the details of virtualizing Domain Controllers, let’s take a step back and ask ourselves if it’s even worth considering.

In my opinion, there are very few scenarios where I would recommend doing a P2V (Physical 2 Virtual) conversion of an existing Domain Controller. The reasons for this are numerous, and they all boil down to one thing: risk.

First and foremost, you should never attempt a hot P2V migration of a Domain Controller. This is a recipe for disaster, as it can cause all sorts of issues with the domain’s consistency and availability. Instead, you must perform a cold P2V migration, which means shutting down the physical server before converting it to a virtual instance.

However, even with a cold migration, there are still many potential pitfalls to avoid. For example, you need to clean up the old driver stack, as well as any potential issues with DNS services or Kerberos authentication. And let’s not forget the possibility of DNS failures, which can bring down the entire domain.

In light of these risks, it’s much safer and easier to simply set up a new Domain Controller in your virtual environment. This approach eliminates the risk of mishandling a P2V conversion and ensures that your domain remains stable and secure.

Of course, some may argue that a P2V conversion is necessary for certain reasons, such as preserving existing data or maintaining compatibility with legacy systems. However, in my experience, these situations are rare and can often be resolved through other means.

In conclusion, while the idea of virtualizing Domain Controllers may seem appealing, it’s not worth the risk of mishandling a P2V conversion. Instead, I recommend starting with a clean slate and setting up a new Domain Controller in your virtual environment. This approach is quick, easy, and risk-free, and it ensures that your domain remains stable and secure. So, to all you vSenseis out there, let this be a lesson: just because you can do something doesn’t mean you should.