Creating an AMI through a Loopback File
http://docs.amazonwebservices.com/AWSEC2/latest/DeveloperGuide/index.html?ami-via-loopback.html
This method involves doing a full operating system installation on a clean root file system, but avoids having to create a new root disk partition and file system on a physical disk. Once you have installed your operating system, the resulting image can be bundled as an AMI with the ec2-bundle-image utility.
