Implement IMDS scanner for task credential retrieval#4945
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mye956
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Apr 29, 2026
mye956
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Apr 29, 2026
mye956
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mye956
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Apr 29, 2026
- Implement Scanner.Scan() to discover iam-ecs-* namespaces, read info files, and fetch credentials - Add rate limiter (~10% of IMDS PPS budget) to leave headroom for other link-local requests on the instance - Cache LastUpdated per namespace to optimize IMDS call volume
mye956
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Apr 29, 2026
ShelbyZ
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Apr 30, 2026
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Summary
Implements the IMDS credential scanner in the shared library (
ecs-agent/credentials/imds). The scanner discoversiam-ecs-*IMDS namespaces, reads their info files, and fetches task credentials with rate limiting. The scanner is not used by the ECS agents today, and the feature is config-disabled.Changes to consume this shared library will come in a follow-up PR. Changes to incorporate metrics in the scanner will also come in a follow-up PR after operational review for the feature.
Implementation details
Testing
New tests cover the changes: yes, added new unit tests
Description for the changelog
Feature - Implement IMDS scanner for task credential retrieval, in the shared library
Additional Information
Does this PR include breaking model changes? No
Does this PR include the addition of new environment variables in the README? No
Licensing
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.