AWS EC2 Creating New Instance with Image Created from Snapshot

When I tried to do this, I encountered an error (which I saw in the System Log):

error: couldn't mount because of unsupported optional features (240)

This is due to ext-fs compatibility issues, which is in-turn caused by trying to boot the server up with an incompatible kernel ID.

To fix this, go to the original instance and note down the kernel ID (be sure to take this down every time you create an AMI to be used to create instances) and use this kernel ID when you are creating the AMI.

Reference:

• http://www.johndz.com/2012/11/recovering-amazon-ec2-instance-from.html