Can I change the root EBS device of my amazon EC2 instance?

Question

I have an EBS backed Amazon EC2 instance. I would like to change the root device on this instance. Can you please advise the best way to go about this?

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Answer 1

Yep, it's dead easy:

1. Stop the instance.
2. Detach the root EBS volume.
3. Attach the alternate EBS volume as the root: /dev/sda1
4. Start the instance.

This presupposes that your alternate EBS volume is bootable, of course - it has to contain the bootable OS image.