Creating AWS Lambda Layer

How to create AWS Lambda Layer (for Python)

From Library

Be sure to work from Python Virtual Environment. Always work from venv. Follow this link. You can also see here.

1. Install Libraries that you want

python -m pip install requests

2. Show it's dependencies (you'll also see it being installed). You'll see Requires line with certifi, urllib3, charset-normalizer, idna

pip show requests

3. Open the folder /Lib/site-packages

4. Copy all the listed Requires packages into a separate directory called python

5. Zip up this folder. Resulting zip and content

6. Terraform Code to use 

locals{
    layer_file = "${path.module}/requests_2_26_0.zip"
}

resource "aws_lambda_layer_version" "requests" {
  filename            = local.layer_file
  layer_name          = "requests"
  compatible_runtimes = ["python3.8"]
  source_code_hash    = data.archive_file.requests.output_base64sha256
}

From Custom Code

1. Create a new folder called python

2. Drop your python code into this folder

3. Create a zip file where python is at root

4. Terraform Code to use (this code will handle the zipping). Your python code should be located at /layer_code/python/my_code.py

locals{
    layer_file = "${path.module}/zips/new_layer.zip"
}
data "archive_file" "requests" {
  type             = "zip"
  output_path      = local.layer_file
  source_dir       = "${path.module}/layer_code"
  output_file_mode = "0666"
}
resource "aws_lambda_layer_version" "new_layer" {
  filename            = local.layer_file
  layer_name          = "new_layer"
  compatible_runtimes = ["python3.8"]
  source_code_hash    = data.archive_file.requests.output_base64sha256
}