The instance metadata service (IMDS) is an on-instance component that provides secure access to Amazon EC2 instance metadata. An instance can be configured to accept incoming metadata requests that use IMDS Version 1 (IMDSv1) or require that all metadata requests use IMDS Version 2 (IMDSv2). IMDSv2 uses session-oriented requests and mitigates several types of vulnerabilities that could be used to try to access the IMDS. For information about IMDSv2, see How Instance Metadata Service Version 2 works in the Amazon Elastic Compute Cloud User Guide.
We recommend that you require IMDSv2 for all Amazon EC2 instances that host Storage Gateway. IMDSv2 is required by default on all newly launched gateway instances. If you have existing instances that are still configured to accept IMDSv1 metadata requests, see Require the use of IMDSv2 in the Amazon Elastic Compute Cloud User Guide for instructions to modify your instance metadata options to require the use of IMDSv2. Applying this change does not require an instance reboot.
