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Editorial Team
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Asked: 2026-05-23T07:20:12+00:00

I have an EBS backed Amazon EC2 instance. I would like to change the

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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?

I only find documentation on changing several attributes of block devices, but they don’t seem to include setting it as the root device.

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  1. Editorial Team

    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 or /dev/xvda (based on AMI used)
    4. Start the instance.

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

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