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Serverless Application Model (SAM)

Note:

  • Must have a bucket when you want to deploy a SAM application via a CLI

  • You can't use the SAM CLI to delete a SAM application. Instead of, using:

    aws cloudformation delete-stack --stack-name my-stack --region my-region --profile my-profile

  • Build app and run local tests

    • Build command: sam build --use-container

    • It will pull a Docker image and build the source function

    • Test command: sam local invoke my_function --event event.json

    • Start API: sam local start-api -> call API: curl localhost:3000/hello

  • Packaging application

    • Create S3 command: aws s3 mb s3://sam-bucket

    • Push sam: sam package --s3-bucket sam-bucket --output-template-file template.yaml

  • Deploying application:

    • Command: sam deploy --template-file template.yaml --stack-name my-stack --capabilities CAPABILITY_IAM

  • Watching logs

    • Command: sam logs -n my-function --stack-name my-stack --tail

What is serverless?

  • Serverless is a way of developing, running, and operation applications without to manage underlying infrastructure

  • SAM can perform all of its operation out of the box. Such as:

    • Building, testing locally

    • Provisioning serverless stacks to AWS

  • SAM template is designed to be used with serverless applications and services

  • SAM template supports:

    • AWS::Serverless::API : creates an API gateway and related resources

    • AWS::Serverless::Application : creates a serverless application

    • AWS::Serverless::Function : Creates a lambda function and related resources

    • AWS::Serverless::HttpApi : Creates an HTTP API gateway and related resources

    • AWS::Serverless::LayerVersion : Creates a lambda layer

    • AWS::Serverless::SimpleTable : creates a simplified DynamoDB table (only a primary key without a sort key)