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We need to do this given how fast AWS is continuing to grow; we will start to run low on IDs for certain EC2 and EBS resources within a year or so. In order to enable the long-term, uninterrupted creation of new instances, reservations, volumes, and snapshots, we need to introduce a longer ID format for these resources. Additional identifiers might need to expand within the next few years as well.
There is a good chance that you won’t need to make any system changes to handle the new format. If you only use the console to manage AWS resources, you might not be impacted at all, but you should still update your settings to use the longer ID format as soon as possible. If you interact with AWS resources via APIs, SDKs, or the AWS CLI, you might be impacted, depending on whether your software makes assumptions about the ID format when validating or persisting resource IDs. If this is the case, you might need to update your systems to handle the new format.
No; only resources that are created after you opt in to the longer format will be affected. Once a resource has been assigned an ID (long or short), that ID will never change. Any resource created with the old ID format will always retain its shorter ID, and any resource created with the new format will retain its longer ID, even if you opt back out.
We want to give you as much time as possible to test your systems with the new format. A long transition window offers maximum flexibility to test and update your systems incrementally and will help minimize interrupts as you add support for the new format.
Yes, you can opt in using the AWS CLI modify-identity-id-format and describe-identity-id-format and specify the desired ARN and resource type. You will need to do this separately for each resource type (instances, volumes, reservations, and snapshots). To opt in the entire account, you must specify the root account as the Amazon Resource Name (ARN).