Question 84561 in Docker Question posted in
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Facing issue KeyError: 'AWS_LAMBDA_RUNTIME_API' – Docker

I am new to lambda wherein trying to use lambda with docker image. I have the requirement to use my own docker image as base one and not the aws provided lambda images. Below is my docker file and base image is python:3.9.6. Bur i am getting below error when i try to execute lambda function.

I am referring below link to do the below implementation.AWS documentation link

# Define function directory
ARG FUNCTION_DIR="/function/"

FROM python:3.9.6 as build-image

# Install aws-lambda-cpp build dependencies
RUN apt-get update && 
  apt-get install -y 
  g++ 
  make 
  cmake 
  unzip 
  libcurl4-openssl-dev

# Include global arg in this stage of the build
ARG FUNCTION_DIR
# Create function directory
RUN mkdir -p ${FUNCTION_DIR}

# Copy function code
COPY app/* ${FUNCTION_DIR}

# Install the runtime interface client
RUN pip install 
        --target ${FUNCTION_DIR} 
        awslambdaric

# Multi-stage build: grab a fresh copy of the base image
FROM python:3.9.6

# Include global arg in this stage of the build
ARG FUNCTION_DIR
# Set working directory to function root directory
WORKDIR ${FUNCTION_DIR}

# Copy in the build image dependencies
COPY --from=build-image ${FUNCTION_DIR} ${FUNCTION_DIR}

ENTRYPOINT [ "/usr/local/bin/python", "-m", "awslambdaric" ]
CMD [ "lambda_function.lambda_handler" ]

Error

raceback (most recent call last):
  File "/usr/local/lib/python3.10/runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/local/lib/python3.10/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/function/awslambdaric/__main__.py", line 20, in <module>
    main(sys.argv)
  File "/function/awslambdaric/__main__.py", line 14, in main
    lambda_runtime_api_addr = os.environ["AWS_LAMBDA_RUNTIME_API"]
  File "/usr/local/lib/python3.10/os.py", line 679, in __getitem__
    raise KeyError(key) from None
KeyError: 'AWS_LAMBDA_RUNTIME_API'

Has anyone faced this issue earlier? how can we solve it?

Tags:

2

Answers


  1. 0

    If you really hunt in the AWS documentation they recommend using this as a framework for creating custom docker images: https://aws.amazon.com/blogs/aws/new-for-aws-lambda-container-image-support/

    You have to install an additional file https://github.com/aws/aws-lambda-runtime-interface-emulator/releases/latest/download/aws-lambda-rie and then setup a script entry.sh and it works

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  2. 0

    You are building a custom docker image if I am correct.

    If you want to test locally you need to use the Runtime Interface Emulator (RIE).

    I ran in a similar issue and solved it through the Testing Images AWS documentation

    You need to add the RIE in your build:

    RUN mkdir -p ~/.aws-lambda-rie && curl -Lo ~/.aws-lambda-rie/aws-lambda-rie 
https://github.com/aws/aws-lambda-runtime-interface-emulator/releases/latest/download/aws-lambda-rie 
&& chmod +x ~/.aws-lambda-rie/aws-lambda-rie

    And alter the entrypoint:

    ENTRYPOINT [ "~/.aws-lambda-rie/aws-lambda-rie","/usr/local/bin/python", "-m", "awslambdaric" ]

    Beware this instance will not work in lambda but only in simulation as suggested in the documentation.

    After you docker image is built, you can start it:

    docker run -p 9000:8080 your-image

    And then you can try sending a test request:

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