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Lambda Layer Creator

This PowerShell script creates AWS Lambda layers using Docker or Podman. It supports both Python and Node.js runtimes and allows for package installation either from a list of packages or from a requirements file.

Features

  • Supports both Python and Node.js Lambda runtimes
  • Uses Docker or Podman for consistent build environments
  • Can install packages from a list or a requirements file (requirements.txt for Python, package.json for Node.js)
  • Option to create only the ZIP file without uploading to AWS
  • Flexible container engine selection (Docker or Podman)

Prerequisites

  • PowerShell 5.1 or later
  • Docker or Podman installed and configured
  • AWS CLI installed and configured (if uploading to AWS)

Usage

powershell .\create-layer.ps1 -layername <string> -runtime <string> [-packages <string[]>] [-requirementsFile <string>] [-zipOnly] [-containerEngine <string>]

Parameters

  • layername: The name of the Lambda layer to create.
  • runtime: The AWS Lambda runtime to use (e.g., python3.12, nodejs14.x).
  • packages: List of packages to install (use this or requirementsFile).
  • requirementsFile: Path to the requirements file (requirements.txt for Python, package.json for Node.js).
  • zipOnly: If specified, only creates the ZIP file without uploading to AWS.
  • containerEngine: Container engine to use: "docker" or "podman" (default).

Examples

  1. Create a Python layer with specific packages:
powershell .\create-layer.ps1 -layername "my-python-layer" -runtime "python3.12" -packages "fastapi","mangum","python-jose" -zipOnly
  1. Create a Node.js layer using a package.json file with Podman:
powershell .\create-layer.ps1 -layername "my-node-layer" -runtime "nodejs14.x" -requirementsFile "path/to/package.json" -containerEngine podman
  1. Create and upload a Python layer to AWS using a requirements.txt file:
powershell .\create-layer.ps1 -layername "my-aws-layer" -runtime "python3.11" -requirementsFile "path/to/requirements.txt"

Notes

  • Ensure you have the necessary permissions to create and upload Lambda layers if using the AWS upload feature.
  • The script uses the official AWS SAM build images for consistent environments.
  • For Python layers, __pycache__ directories are excluded from the final ZIP file.

Contributing

Contributions to improve the script are welcome. Please feel free to submit a Pull Request.

License

MIT License