Question 199544 in Docker Question posted in
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How to define handler in a AWS lambda docker image

I am deploying a Docker container on AWS Lambda with the below content of my Dockerfile:

FROM amazon/aws-cli:2.12.3

# hadolint ignore=DL3033
RUN yum update -y 
    && yum install -y bash curl git jq make tar unzip xmlstarlet zip 
    && yum clean all 
    && rm -rf /var/cache/yum

WORKDIR /opt

ENTRYPOINT []

COPY ./test.sh ./

CMD ["sh", "./test.sh"]

and inside my test.sh I’m printing :
test.sh:

#!/bin/sh

set -eo pipefail

echo "Inside Lambda"

Now, when I test this lambda I’m observing two weird things:

  1. "Inside Lambda" is printed twice. Seems like I’m also running test.sh and lambda itself is also running test.sh
  2. Final out of the lambda is error state: "Error: Runtime exited without providing a reason" : May be I need to pass a signal that script run successfully.

Please help me to solve these two issues. Thanks in advance!

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I resolve my issue by using the following dockerfile to run a bash script:

    FROM amazon/aws-lambda-provided:al2


RUN yum update -y 
    && yum install -y bash curl jq make awscli 
    && yum clean all 
    && rm -rf /var/cache/yum

WORKDIR /var/runtime/
COPY ./bootstrap ./bootstrap
RUN chmod 755 ./bootstrap

WORKDIR /var/task/
COPY ./download_logs.sh ./
RUN chmod 755 ./script.sh

CMD ["script.sh.handler"]

  2. 0

    You cannot run a container-based Lambda off of a totally custom Docker image. It should use one of the base images and it has to use a Runtime Interface Client to be compatible with Lambda. There are a few RIEs already available: https://docs.aws.amazon.com/lambda/latest/dg/images-create.html

    To just stick to bash + docker-based Lambda, you would have to write your custom RIE as there’s no official one for bash. In the past I used Python-based images to invoke the bash scripts from Python – it worked quite nicely.

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