Lambda image is invalid

Question

I have been using the same lambda image using AWS's python 3.8 as base image for a while. During last minor code change the created image is no longer  associable with the lambda. It gives the error "The image provided is invalid". I have tried multiple ways by creating new lambda, new image created on standalone machine etc. the container runs locally if I change the Entrypoint and execute the file with in the container

Dockerfile:

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

RUN yum update -y
RUN python -m pip install --upgrade pip
COPY requirements.txt requirements.txt
RUN  pip install -r requirements.txt
RUN yum -y install git
RUN curl https://packages.microsoft.com/config/rhel/6/prod.repo > /etc/yum.repos.d/mssql-release.repo
RUN ACCEPT_EULA=Y yum install -y msodbcsql17
RUN ACCEPT_EULA=Y yum install -y mssql-tools
RUN yum install -y unixODBC-devel
COPY . .
CMD [ "app.lambda_handler" ]

Answer

Dockerfile Syntax: ensure that your Dockerfile has the correct syntax. There is a missing backslash at the end of the RUN yum update -y line.
Check your image tag 
Ensure that you are using a valid tag for the base image (public.ecr.aws/lambda/python:3.8). AWS Lambda periodically updates their base images, so make sure the tag is correct
```
FROM public.ecr.aws/lambda/python:3.8

RUN yum update -y \
    && python -m pip install --upgrade pip \
    && pip install -r requirements.txt \
    && yum -y install git \
    && curl https://packages.microsoft.com/config/rhel/6/prod.repo > /etc/yum.repos.d/mssql-release.repo \
    && ACCEPT_EULA=Y yum install -y msodbcsql17 \
    && ACCEPT_EULA=Y yum install -y mssql-tools \
    && yum install -y unixODBC-devel

COPY . .

CMD [ "app.lambda_handler" ]

```

Check CloudWatch Logs for the Lambda function for any error messages or logs that might provide insights into the issue  and also ensure that you are using a recent version of the AWS CLI  
aws --version
AWS Lambda has a maximum image size limit. Ensure that your Docker image size does not exceed this limit :- https://repost.aws/questions/QUPfIJnXi3RfOWTH3P24P9YA/what-is-the-maximum-size-for-a-lambda-docker-image

Hope it clarifies and if does I would appreciate answer to be accepted so that community can benefit for clarity, thanks ;)

Lambda image is invalid

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