What are Lambda layers, and when would you use them?
Lambda layers are a distribution mechanism for libraries, custom runtimes, and other dependencies that can be used by multiple Lambda functions. They help you avoid duplicating code across functions and keep your deployment packages smaller and more maintainable.
When to Use Lambda Layers
Sharing common code or utility functions across multiple Lambda functions
Including third-party libraries or frameworks (e.g.,
requestsfor Python oraxiosfor Node.js)Packaging custom runtimes or binaries
Reducing deployment package size by moving dependencies into a separate layer
Enforcing standardized dependencies or configurations across teams or projects
Creating and Using a Lambda Layer via AWS CLI