Questions
5 of 7
1How do you deploy a Lambda function?
2What is a Lambda deployment package?
3What are Lambda versions and aliases?
4How do you manage different environments (dev, prod) in Lambda?
5What are Lambda layers, and when would you use them?
6What is the difference between environment variables and AWS Systems Manager (SSM) Parameter Store for Lambda configuration?
7How can you manage dependencies in a Lambda function?
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05 / 07

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
  1. 1

    Sharing common code or utility functions across multiple Lambda functions

  2. 2

    Including third-party libraries or frameworks (e.g., requests for Python or axios for Node.js)

  3. 3

    Packaging custom runtimes or binaries

  4. 4

    Reducing deployment package size by moving dependencies into a separate layer

  5. 5

    Enforcing standardized dependencies or configurations across teams or projects

Creating and Using a Lambda Layer via AWS CLI