Is it possible to execute lambda functions from sdk image?

[zeusongit]

Hey, so I have a use-case where I have an executable that requires .NET6 SDK and the lambda function should trigger that executable with the required arguments to run it inside lambda, but the aws lambda runtime for .NET6 provide by Amazon does not include the SDK part to run the executable. Is it possible to run the Lambda function using the .NET6 sdk image?

[ashishdhingra]

@zeusongit I'm unsure if I understand your use case correctly. You can deploy Lambda function in a custom runtime using the available blueprints. Lambda function runs inside a container within a restricted space and the only writable area is /tmp directory.

• What is the logic behind the .NET executable?
• Couldn't you execute that logic as part of Lambda function? Refer links below:
  • Introducing the .NET 6 runtime for AWS Lambda
  • AWS Lambda adds support for .NET 6
  • AWS Lambda with .NET 6 – Getting Started with Serverless Computing (adding here just for reference)
• If the logic is so complex that it needs to be executed as part of executable, couldn't you as a better design,
  • Use an SQS queue.
  • Use Lambda function to push a message with arguments to SQS queue.
  • Write logic as part of recurring process which polls the SQS queue for the incoming message and executes the .NET executable with required arguments.

Thanks,
Ashish

[normj]

@zeusongit There are no plans to make the .NET SDK available in the Lambda managed runtime. I would increase the size of the base runtime significantly given the SDK is at least three times the size of the runtime and this could affect cold starts for Lambda.

The work around for this use cases is build your own Lambda container image that has the SDK built into along with our Lambda runtime libraries. Then you can deploy your Lambda function as a container image with all of the unique runtime dependencies that you require. Here is Lambda's docs for creating images: https://docs.aws.amazon.com/lambda/latest/dg/images-create.html. And here is our README for how we create the .NET Lambda base images that you can borrow from. https://github.com/aws/aws-lambda-dotnet/tree/master/LambdaRuntimeDockerfiles

[normj]

I guess you could also avoid even creating your own custom base image with the SDK but for an image based Lambda function update the Dockerfile to install the SDK into the container image as built time. That would avoid having to maintain a separate base image but your builds would be slightly longer.

[zeusongit]

Thank you for the reply, it is for a POC at this point, hence the lack of a better design, the answers cleared some doubts. Thanks

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.