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Deploying serverless applications

AWS SAM uses AWS CloudFormation as the underlying deployment mechanism. For more information, see What is AWS CloudFormation? in the AWS CloudFormation User Guide.

You can deploy your application using AWS SAM command line interface (CLI) commands. To automate your deployments, you can also use other AWS services that integrate with AWS SAM.

The standard inputs to deploying serverless applications are the build artifacts created using the sam build command. For more information about sam build, see Building serverless applications.

Deploying using the AWS SAM CLI

After you develop and test your serverless application locally, you can deploy your application using the sam deploy command.

If you want AWS SAM to guide you through the deployment with prompts, specify the --guided flag. When you specify this flag, the sam deploy command zips your application artifacts, uploads them to either Amazon S3 (for .zip file archives) or Amazon ECR (for contain images), and then deploys your application to the AWS Cloud.

Example:

# Deploy an application using prompts:
sam deploy --guided

Publishing serverless applications

The AWS Serverless Application Repository is a service that hosts serverless applications that are built using AWS SAM. If you want to share serverless applications with others, you can publish them in the AWS Serverless Application Repository. You can also search, browse, and deploy serverless applications that others have published. For more information, see What Is the AWS Serverless Application Repository? in the AWS Serverless Application Repository Developer Guide.

Automating deployments

To automate the deployment process of your serverless application, you can use AWS SAM with a number of other AWS services.

  • CodeBuild: Use AWS CodeBuild to build, locally test, and package your serverless application. For more information, see What is AWS CodeBuild? in the AWS CodeBuild User Guide.
  • CodeDeploy: Use AWS CodeDeploy to gradually deploy updates to your serverless applications. For more information, see Deploying serverless applications gradually.
  • CodePipeline: Use AWS CodePipeline to model, visualize, and automate the steps that are required to release your serverless application. For more information, see What is AWS CodePipeline? in the AWS CodePipeline User Guide.

Troubleshooting

AWS SAM CLI error: "Security Constraints Not Satisfied"

When executing sam deploy --guided, you are prompted with the question HelloWorldFunction may not have authorization defined, Is this okay? [y/N]. If you respond to this prompt with "N" (the default response), you see the following error:

 
Error: Security Constraints Not Satisfied

The prompt is informing you that the application you're about to deploy may have an API Gateway API configured without authorization. By responding "N" to this prompt (the default), you are saying that this is not OK.

To fix this, you have the following options:

  • Configure your application with authorization. For information about configuring authorization, see Controlling access to API Gateway APIs.
  • Respond to this question with "Y" to indicate that you are OK with deploying an application that has an API Gateway API configured without authorization.