AWS SAM CLI Adds BuildKit Support for AWS Lambda Functions Packaged as Container Images

AWS has updated the SAM CLI to support BuildKit for developers who package their Lambda functions as container images. BuildKit is a modern build engine for Docker that introduces advanced features such as parallelized build stages and more efficient caching mechanisms. By leveraging these capabilities, developers can significantly reduce the time required to build and iterate on serverless applications during the development lifecycle. This integration allows for a more streamlined workflow when managing complex container environments for serverless workloads. Using BuildKit enables more sophisticated build-time optimizations that were previously difficult to achieve with the standard Docker build process. It also provides better handling of secrets and SSH forwarding during the image construction phase. Engineers can enable this feature through the SAM CLI configuration or environment variables, allowing for seamless integration into existing CI/CD pipelines. This update specifically targets the build phase of the SAM workflow for container-based deployments. Users should ensure their local Docker environment or build runners support BuildKit to take full advantage of these performance improvements. Detailed implementation steps and compatibility requirements are available in the official AWS documentation for the SAM CLI.