serverless-lambda-layers

Serverless Lambda Layers

Key	Value
Services	Lambda
Integrations	Serverless Framework
Categories	Serverless

Introduction

A demo application illustrating Lambda layers using LocalStack, deployed via the Serverless framework. Lambda layers allow you to package shared code and dependencies separately from your function code, enabling reuse across multiple functions.

Prerequisites

• A valid LocalStack for AWS license. Your license provides a LOCALSTACK_AUTH_TOKEN to activate LocalStack.
• Docker
• localstack CLI
• Node.js with npm
• Serverless Framework

Check prerequisites

make check

Installation

make install

Start LocalStack

export LOCALSTACK_AUTH_TOKEN=<your-auth-token>
make start

Run the application

make run

The script deploys the Lambda function with its layer via the Serverless framework and invokes it to verify the layer is loaded correctly.

You should see a success output:

{
    "StatusCode": 200
}

Check the LocalStack container logs for the Lambda output:

>START RequestId: ba4efc87-7bf9-1705-9f45-8e84ba8eb071 Version: $LATEST
> 2019-10-23T14:25:12.709Z	ba4efc87-7bf9-1705-9f45-8e84ba8eb071	INFO	This text should be printed in the Lambda
> END RequestId: ba4efc87-7bf9-1705-9f45-8e84ba8eb071
> REPORT RequestId: ba4efc87-7bf9-1705-9f45-8e84ba8eb071	Duration: 22.65 ms	Billed Duration: 100 ms	Memory Size: 1536 MB	Max Memory Used: 42 MB

License

This code is available under the Apache 2.0 license.