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I have a lambda which was created and deployed with CloudFormation. The lambda, as of now, uses the supported .NET Core 3.1 runtime but I want to use the "unsupported" .Net Core 5 so I have created a Docker image which the lambda can run.

The problem I have is that CloudFormation can't seem to change the lambda from running a supported runtime to running a Docker image. I get Please don't provide ImageUri when updating a function with packageType Zip. when updating the CloudFormation stack with the updated template.

This is how my CloudFormation template looks like:

MyFunction:
    Type: "AWS::Serverless::Function"
    Properties:
        PackageType: Image
        ImageUri: <uri-to-ecr-docker-image>
        ...
    Metadata:
        Dockerfile: Dockerfile
        DockerContext: .
        DockerTag: v1

Any ideas on how to solve this?

Junker
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2 Answers2

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Configuring functions defined as container images

You cannot convert an existing .zip file archive function to use a container image. You must create a new function.

samtoddler
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    Thank you, completely missed that. I renamed the function in my template and then I had to add these permissions https://stackoverflow.com/a/65151634/6193522 – Junker Feb 28 '21 at 17:31
  • +1. Just to clarify what to do : you need to create new lambda function (your current is not for image-based deployments) with "Image" option, after this - should works/deploy as expected – Nigrimmist Apr 25 '22 at 22:42
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simple way Deploy a fresh environment with a docker runtime from the start.

mohamed elshazly
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