Lambda Docker Image Support CDK Sample

lambdaDockerImageDemo.md

Lambda container image support

Docs

https://docs.aws.amazon.com/lambda/latest/dg/images-create.html

Dockerfile

FROM public.ecr.aws/lambda/python:3.8

RUN pip install wikipedia

# Copy function code
COPY demo.py ${LAMBDA_TASK_ROOT}

# Set the CMD to your handler (could also be done as a parameter override outside of the Dockerfile)
CMD [ "demo.handler" ]

demo.py

#!/usr/bin/env python3

import wikipedia

def handler(event, context):
    if event:
        result = wikipedia.page(event.get('wiki', 'los angeles'))
        return "{}".format(result.summary)
    else:
        return "Hello from CFTC! You didn't tell me to look anything up, much sad."

Build:

docker build -t test .

Run:

docker run -p 8080:8080 test

Test:

curl -XPOST "http://localhost:9000/2015-03-31/functions/function/invocations" -d '{"wiki": "los angeles"}'

CDK Code

from aws_cdk import core, aws_lambda


class LambdaContainerImageSupportStack(core.Stack):

    def __init__(self, scope: core.Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)

        # I <3 Lambda
        self.lambda_function = aws_lambda.Function(
            self, "ContainerImageDemo",
            code=aws_lambda.Code.from_asset_image(directory="./", exclude=["cdk.out"]),
            handler=aws_lambda.Handler.FROM_IMAGE,
            runtime=aws_lambda.Runtime.FROM_IMAGE,
            function_name="cftc_wiki_lambda"
        )

app = core.App()
LambdaContainerImageSupportStack(app, "lambda-container-image-support")
app.synth()

Deploy Lambda and container image to aws

cdk deploy --require-approval never

Console

Create test event, json '{"wiki": "amazon web services"}'

CLI

aws lambda invoke --function-name cftc_wiki_lambda --payload '{"wiki": "amazon web services"}' lambda_out

docker run with port 8080, but curl with 9000