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

2. 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

3. 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