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

When your volume is mounted, it gets a post-fix with numbers, eg: when /dev/sda is mounted, its mounted as /dev/sda1, /dev/sda2 depending on the partitions you make. As we are mounting the root device itself, it assumes the device is already mounted, so we need to give /dev/sda1 for mounting the volume as root device. Note: There shouldn't be any root volume attached.

Follow these steps: 1) Go to your volumes, select attach volumes from Action. 2) Select your instance 3) For mounting as root, give the device name as /dev/sda1 4) Start your instance.