What are the differences between AWS Lambda layers and packages?

What are the differences between AWS Lambda layers and packages?

AWS Lambda layers are a way to package libraries and dependencies separately from your function code, allowing for better reuse. Packages, on the other hand, are typically the entire deployment package that includes your function code and its dependencies.

Can you give me an example of when to use layers?

Sure! If you have multiple Lambda functions that use the same library, you can create a layer for that library. This way, you only need to update the library in one place, rather than in each function's package.

Are there any limitations to using layers?

Yes, there are some limitations. For instance, a Lambda function can have a maximum of 5 layers, and the total unzipped size of the function and layers combined cannot exceed 250 MB.

How do I create a layer in AWS Lambda?

You can create a layer by packaging your libraries into a .zip file and uploading it through the AWS Management Console or using the AWS CLI. Then, you can attach the layer to your Lambda function.