AWS Lambda: Using container image but still getting program path not found

Question

I have configured AWS Lambda function to use container image. I have build the image and uploaded it in ECR and using this image to run the lambda function. I'm still facing errors:

[ERROR] PortScannerError: 'nmap program was not found in path. PATH is : /var/lang/bin:/usr/local/bin:/usr/bin/:/bin:/opt/bin'
Traceback (most recent call last):
  File "/var/lang/lib/python3.8/imp.py", line 234, in load_module
    return load_source(name, filename, file)
  File "/var/lang/lib/python3.8/imp.py", line 171, in load_source
    module = _load(spec)
  File "<frozen importlib._bootstrap>", line 702, in _load
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 843, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/var/task/app.py", line 36, in <module>
    nmScan = nmap.PortScanner()
  File "/var/task/nmap/nmap.py", line 132, in __init__
    raise PortScannerError(

When I run the script from the container manually it is running fine. While lambda executes this, I get the above error.

using this sample Dockerfile structure to create the Dockerfile:

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

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

# Install the function's dependencies using file requirements.txt
# from your project folder.

COPY requirements.txt  .
RUN  pip3 install -r requirements.txt --target "${LAMBDA_TASK_ROOT}"
RUN  yum install -y nmap

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

Do I need to specify the ENTRYPOINT?

Answer 1

Finally, it worked for me.

In the Lambda function, we can override the value of ENTRYPOINT, CMD, and WORKDIR.

So, I did the override by passing ENTRYPOINT, CMD, and WORKDIR(it defaults to /var/task for AWS Lambda).