Solved: How to bundle Python apps within AWS CDK

Hi 👋

💡 Solution at the end 🙈

So I've setup a basic TypeScript project with the AWS-CDK by running cdk init app --language=typescript. Now I'd like to use some lambda functions written in Python because… math 🤓

I am using @aws-cdk/aws-lambda-python to declare these functions like so:

import * as cdk from "@aws-cdk/core"
import * as lambdaPython from "@aws-cdk/aws-lambda-python"

export class MyStack extends cdk.Stack {
  constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props)

    new lambdaPython.PythonFunction(this, "MyFunction", {
      entry: "lib/lambda/my_function",
    })
  }
}

And within the lib/lambda/my_function folder, there is the index.py with a handler function which are both the defaults for the package.

But running cdk synth results in this:

$ cdk synth
[Status 1] stdout:


stderr: Cannot connect to the Docker daemon. Is the docker daemon running on this host?

I have no idea about how Docker needs to be setup. Unfortunately, I cannot find any info on this within the AWS documentation. Does anyone know what I'd have to do to get the (correct? 😅) Docker container running?

Solution

Use the latest Docker version, maybe? 😅 I had a very old one (1.11.XX) running and now it works by installing the latest Docker Desktop (19.X.X) 🤷

So overall: This is really nice, you can very easily mix TypeScript and Python in such a setup. Awesome! 🚀 😄