Need to Downgrade m6a.large instance running as an Active Directory Domain Controller on AWS to t3a.medium.

Question

Hi All, I have an EC2 Server (m6a.large) running as a Domain Controller. The Utilization of the Instance is very low, and I want to downgrade the instance. I am looking at t3a.medium instance as the downgraded instance. I want to know if I turn off the instance and change the instance type, will the instance keep working as a Domain Controller or do I need to take more steps before downgrading of the Instance.
Thank you!

Answer

Aside from the CPU, memory and some networking performance, the application shouldn't notice the instance change. However, if you have an external IPv4 address configured and its not an Elastic IP (EIP) it will change. If you're services use this IP in anyway I'd strongly consider allocating and assigning an EIP, updating the resources and service that use it (ie Route53, apps and scripts, etc) before the start/stop event.

I'm assuming you're doing this for cost savings. If correct, why not consider purchasing a Reserve instance and move up to a t3a.large (or higher) instance type? An m6a.large to a t3a.medium if a significant downgrade. Buying a reserve instance will give you a little more compute power as a buffer and still keep a the cost reduction.  Just a thought.

Need to Downgrade m6a.large instance running as an Active Directory Domain Controller on AWS to t3a.medium.

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