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In order to upgrade our EC2 instances (or downgrade for that matter) I use the AWS console to "Create Image (EBS AMI)" and then I launch the AMI once it has been created. Is there a way that would make it possible for me to upgrade/downgrade without having to create the AMI?

Thanks for your help.

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up vote 3 down vote accepted

You can check the API tools command ec2-modify-instance-attribute. You need to stop the instance, apply the command and start it again.

I've done this with my Linux AMI's. :)

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Thanks, that helps a bunch! – CLJ Sep 23 '10 at 20:00

The only way to persist changes is via EBS. AMIs are read-only, though you can always use one AMI to create another.

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