
Developed DNS support for local Lambda containers in the aws/aws-sam-cli repository, enabling developers to specify DNS servers during local development using the --container-dns option across sam local invoke, start-api, and start-lambda commands. The work involved refactoring DNS handling for consistency, implementing multi-DNS support, and introducing long-running test hooks to facilitate container inspection. Leveraged Python, Docker, and AWS SAM to deliver comprehensive integration and unit tests, ensuring DNS configurations are correctly applied within running containers. This feature improved local development fidelity for DNS-dependent applications, enhanced debugging workflows, and strengthened CI coverage by validating DNS settings through automated testing.
April 2026 monthly summary: Implemented DNS support for AWS SAM CLI local Lambda containers and strengthened local-debugging reliability. Key deliverables include a new --container-dns option across sam local invoke, start-api, and start-lambda to configure DNS servers in Dockerized Lambda containers, with multi-DNS support and end-to-end tests. Also refactored DNS handling for consistency (container_dns), added long-running test hooks to keep containers alive for DNS inspection, and added extensive integration tests ensuring DNS is correctly applied in containers. All 6,959 unit tests passing; integration tests validate DNS configuration in running containers. Business impact: improved local development fidelity for DNS-dependent apps, faster debugging, and more robust CI/test coverage.
April 2026 monthly summary: Implemented DNS support for AWS SAM CLI local Lambda containers and strengthened local-debugging reliability. Key deliverables include a new --container-dns option across sam local invoke, start-api, and start-lambda to configure DNS servers in Dockerized Lambda containers, with multi-DNS support and end-to-end tests. Also refactored DNS handling for consistency (container_dns), added long-running test hooks to keep containers alive for DNS inspection, and added extensive integration tests ensuring DNS is correctly applied in containers. All 6,959 unit tests passing; integration tests validate DNS configuration in running containers. Business impact: improved local development fidelity for DNS-dependent apps, faster debugging, and more robust CI/test coverage.

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