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Once your AMI files have been uploaded to S3, the last step necessary to make your own AMI ready for use is to register it. The registration step tells the EC2 service where to find the image’s manifest file and, through this, all the other image files.
You can register your AMI using the RegisterImage API method described in Section 5.9” in Chapter 5, or you can use the ec2-register command provided with Amazon’s tools. To use the API method, you would run the following commands in interactive Ruby: