Thread by @clare_liguori

I wrote a tool called img2lambda to take Docker images and convert them to AWS Lambda layers! 🥳
github.com/awslabs/aws-la…

Thread below on when img2lambda is useful 👇

If you like Docker for building stuff & want to use Lambda layers, img2lambda is for you!

Write a Dockerfile to compile a custom runtime & install libraries, then take advantage of all the goodness of Docker build caching to get fast builds

docker build -t my-custom-runtime .

If you base your Docker image on lambci (hello multi-stage builds!), you can test your runtime locally too!

Dockerfile:
FROM lambci/lambda:provided

docker run --rm -v "$PWD":/var/task my-custom-runtime

By building your Lambda layers with Docker, you can store them in Docker registries like Amazon ECR & Docker Hub until you're ready to publish to Lambda.

Plus, you can use container image security tools & vulnerability scanners like clair-scanner & Sysdig with your runtime image

When you're ready to publish the layers to Lambda, the img2lambda tool will inspect all the layers in the Docker image, find everything under /opt, and publish new layers to Lambda containing those files

img2lambda -i my-custom-runtime:latest -r us-east-1

Props to @michaelmoussa for his excellent PHP custom Lambda runtime blog post that started me down the path of building this thing!
aws.amazon.com/blogs/apn/aws-…