Amazon Elastic Compute Cloud Developer Guide Glossary Amazon Machine Image An Amazon Machine Image (AMI) is an encrypted machine image (AMI) stored in Amazon S3. It contains all the information necessary to boot instances of your software. Explicit Launch Permission Launch permission granted to a specific user. Instance Once an AMI has been launched, the resulting running system is referred to as an instance. All instances based on the same AMI start out identical and any information on them is lost when the instances are terminated or fail. Group A set of customer instances that have been designated by the customer as being related by assigning them the same security group when the instances were first run. The Amazon EC2 firewall controls access to instances based on the instance's group membership and the rules defined for the group. Launch Permission AMI attribute allowing users to launch an AMI Public AMI An AMI that all users have launch permissions for. Reservation A collection of instances started as part of the same launch request. Shared AMI An AMI that users other than the owner have launch permissions for. API Version 2007-03-01 156
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