Appendix A: Resources

AWS Account

Global

You use the same AWS account in all Regions.

DevPay Product Codes

Global

You use the same DevPay product codes throughout all Regions.

Amazon EC2 System Identifiers

Regional

Includes the AMI ID, Instance ID, EBS Volume ID, EBS Snapshot ID, and so on.

Instances

Availability Zone

Instances are tied to Availability Zones. However, the instance ID is tied to the Region.

AMIs

Regional

AMIs are tied to the Region where its files are located within Amazon S3.

Security Groups

Regional

Security groups are not copied across Regions. Instances within the Region cannot communicate with instances outside the Region using group-based firewall rules. Traffic from instances in another Region is seen as WAN bandwidth.

SSH Key Pairs

Regional or Global

The SSH key pairs that you create with ec2-add-keypair, CreateKeyPair, or in the AWS Management Console work only in the Region where you create them. However, you can optionally create an RSA key pair with a third-party tool and upload the public key to AWS. That key pair works in all Regions. For more information, go to ec2-import-keypair in the Amazon Elastic Compute Cloud Command Line Reference or ImportKeyPair in the Amazon Elastic Compute Cloud API Reference.

User-Supplied Identifiers

Regional

Includes security group names, SSH key pair names, and so on. Although you can create the same names in multiple Regions, they have no relationship to each other.

Elastic IP Addresses

Regional

Elastic IP addresses are tied to a Region and cannot be mapped across Regions.

EBS Volumes

Availability Zone

An Amazon EBS volume must be located within the same Availability Zone as the instance to which it attaches.

EBS Snapshots

Regional

Snapshots are tied to Regions and can only be used for volumes within the same Region.