Amazon has added that AWS Serverless Application Model Command Line Interface (SAM CLI) now includes support for Finch, an open-source tool for containers that is an alternative to Docker for local development and testing of serverless applications. SAM CLI previously relied only on Docker to execute containers on developers’ machines. In this update, SAM CLI can automatically detect and utilize Finch when Docker is not present, or developers can specifically set Finch as the default container tool.
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This improvement is applicable to all key SAM CLI commands sam build, sam local invoke, sam local start-api, and sam local start-lambda in order to provide a uniform experience either using Finch or Docker. The change provides developers with additional freedom in choosing their local container runtime and makes it easier to develop serverless apps by letting them build, test, debug, and package functions locally prior to deployment to the AWS Cloud.
