Move instance from one subnet to another
A customer wants know the process to move an instance from one subnet to another. I referred them to creating a snapshot, then image and creating a new instance. They now have the following question.
Does mac address change when you launch a new machine from snapshot?
Does Window SSID change when you launch a new machine from snapshot?
Based on my testing mac does change but SID does not. But I haven't tested this on a domain joined machine. Any insight would be appreciated on how to get this done.
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Since this is a new instance on a new host the MAC address will indeed change as you noted as there is new underlying hardware. If you are restoring from a snapshot the SID will not change as the operating system remains the same (and still domain joined) as this is an exact block for block copy (just make sure the machine is shutdown prior to snapshot). For the most part SIDs are not exposed outside of the machine in any meaningful way so even having duplicate SIDs would not be a concern. Just make sure the source machine is shut down as two duplicate machines referencing the same machine object on AD will cause problems (possibly locking the machine account).
This is of course if you are moving the instance and not cloning the instance. If you are cloning the instances you should be using Sysprep before you create the AMI as there are a lot of duplicate settings that could be problematic for other applications like SCCM, WSUS, etc. that use other agents and identifies to reference that machine. The SID here is rarely the culprit of these issues. This is the same process you would use to create any base AMI for Windows.
This is much better explained by the following article from 2009 which is still very relevant today.
The Machine SID Duplication Myth (and Why Sysprep Matters)
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