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README.md

LocalStack Demo: Lambda Container Images

Simple demo application illustrating Lambda container images in LocalStack. The Lambda image is built using Docker and pushed to a local ECR registry.

Prerequisites

Installing

To install the dependencies:

make install

Running

Make sure that LocalStack is started:

LOCALSTACK_AUTH_TOKEN=... DEBUG=1  localstack start

The following command builds, deploys, and runs the Lambda container image locally:

make run

You should see some logs and a success output in the terminal:

$ make run
Creating a new ECR repository locally
Building the Docker image, pushing it to ECR URL: localhost:4513/repo1
...
Deploying Lambda function from container image locally
{
    "FunctionName": "ls-lambda-image",
    ...
    "PackageType": "Image"
}
Invoking Lambda function from container image
{
    "StatusCode": 200,
    "LogResult": "",
    "ExecutedVersion": "$LATEST"
}
Done - test successfully finished.

The logs of the Lambda invocation should be visible in the LocalStack container output (with DEBUG=1 enabled):

DEBUG:localstack_ext.services.awslambda.lambda_extended: Log output for invocation of Lambda "ls-lambda-image":
INIT: Using Lambda API Runtime target host: 'ls-lambda-image.us-east-1.localhost.localstack.cloud:4566'
INIT: Starting daemons...
INIT: Host 'ls-lambda-image.us-east-1.localhost.localstack.cloud' resolves to '172.17.0.2'
Starting XRay server loop on UDP port 2000
Starting DNS server loop on UDP port 53
-----
Hello from LocalStack Lambda container image!

Troubleshooting

UnsupportedMediaTypeException

An error occurred (UnsupportedMediaTypeException) when calling the Invoke operation (reached max retries: 0): The payload is not JSON: b'\xb5\xeb-\xb5\xeb-'

Solution: Downgrade your awslocal CLI to version 1 because invoking lambda functions differs in version 2 (see major changes in aws cli and limitations of awscli-local) or update the lambda invocation:

awslocal lambda invoke --cli-binary-format raw-in-base64-out --function-name ls-lambda-image --payload '{"test": "test"}' /tmp/lambda.out --log-type Tail --query 'LogResult' --output text |  base64 -d

License

This code is available under the Apache 2.0 license.