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Deploy Python Lambda functions with container images

You can deploy your Lambda function code as a container image. AWS provides the following resources to help you build a container image for your Python function:

• AWS base images for Lambda

  • These base images are preloaded with a language runtime and other components that are required to run the image on Lambda. AWS provides a Dockerfile for each of the base images to help with building your container image.

• Open-source runtime interface clients

  • If you use a community or private enterprise base image, add a runtime interface client to the base image to make it compatible with Lambda.

What’s In This Document

• Create Docker image container
• Create app.py as lambda handler
• Build and push the image to ECR
• Create Lambda container image
• Test the lambda function

🚀 Create Docker image container

1. Create an image from an alternative base image

Dockerfile.alter

FROM python:3.8-buster

RUN apt-get update && \
    apt-get install -y python3-pip && \
    pip3 install awslambdaric

COPY app.py ./

ENTRYPOINT [ "/usr/local/bin/python", "-m", "awslambdaric" ]
CMD ["app.handler"]

2. Create an image from AWS base image

Dockerfile.aws

FROM amazon/aws-lambda-python:3.8

COPY app.py ./

CMD ["app.handler"]

🚀 Create app.py as lambda handler

import sys


def handler(event, context):
    return 'Hello from AWS Lambda using Python' + sys.version + '!'

🚀 Build and push the image to ECR

aws ecr get-login-password --region ap-southeast-1 | docker login --username AWS --password-stdin 111111111111.dkr.ecr.ap-southeast-1.amazonaws.com
docker build -t pythonlambda .
docker tag pythonlambda:latest 111111111111.dkr.ecr.ap-southeast-1.amazonaws.com/pythonlambda:latest
docker push 111111111111.dkr.ecr.ap-southeast-1.amazonaws.com/pythonlambda:latest

🚀 Create Lambda container image

🚀 Test the lambda function

1. Invoke lambda function

• Start container

docker rm -f lambdaimagetest
docker run -d --name lambdaimagetest -it pythonlambda:latest bash
docker exec -it lambdaimagetest bash

• Invoke lambda function

⚡ $ aws lambda invoke --function-name python-lambda-image --region ap-southeast-1 outfile                                                                                                                          
{
    "StatusCode": 200,
    "ExecutedVersion": $LATEST"
}
⚡ $ cat outfile                                                                                                                                                                                                    
"Hello from AWS Lambda using Python3.8.5 (default, Aug  5 2020, 08:22:02) \n[GCC 8.3.0]!"

2. Call lambda API from local container

• This should be performed from AWS image base
• Run container

⚡ $ docker run -d --name testapi -p 9000:8080 pythonlambda:latest

• Call API

⚡ $ curl -XPOST "http://localhost:9000/2015-03-31/functions/function/invocations" -d '{}'
"Hello from AWS Lambda using Python3.8.6 (default, Dec 16 2020, 01:05:15) \n[GCC 7.3.1 20180712 (Red Hat 7.3.1-11)]!"

• Deploy new image
• Invoke lambda function

⚡ $ aws lambda invoke --function-name python-lambda-image --region ap-southeast-1 outfile                                                                                                                          
{
    "StatusCode": 200,
    "ExecutedVersion": "$LATEST"
}
⚡ $ cat outfile
"Hello from AWS Lambda using Python3.8.6 (default, Dec 16 2020, 01:05:15) \n[GCC 7.3.1 20180712 (Red Hat 7.3.1-11)]!"

Read More

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• Create AWS-CDK image container

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