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Running ASP.NET 8 Minimal API on AWS Lambda with Container Image

· 14 min read
Akhan Zhakiyanov
Akhan Zhakiyanov
Lead engineer
warning

Code samples were updated to run with x86_64 architecture

.NET 8 is finally here, since its release over a month ago.

Probably one of the much anticipated feature was Native AOT and its support for ASP.NET Core. Benefits coming along with it (such as minimized disk footprint, reduced startup time, and reduced memory demand) will lead to exploration how to run ASP.NET Core 8 apps in AWS Lambda.

Last year AWS gave us only two options to run .NET 7 Lambda functions: either container image or custom runtime. Now, in a twist for 2024, AWS is throwing its full support behind .NET 8 runtime, set to drop officially sometime in January. I think it's due to the fact that .NET 8 is an LTS release with a solid 3-year support plan.

And today I will show you the simplest way to run ASP.NET Core 8 in AWS Lambda without tearing everything apart!

info

This article targets experienced ASP.NET Core developers who considering to run their apps in serverless environment without major changes in existing programming model

TL;DR expected changes:

  • use Amazon.Lambda.AspNetCoreServer.Hosting package with .AddAWSLambdaHosting extension method
  • use AWS managed base image for .NET 8. Currently only public.ecr.aws/lambda/dotnet:8-preview is available
  • use CMD with assembly name instead of function handler string in Dockerfile

All codebase is available at: https://github.com/ahanoff/how-to/tree/main/aspnet8-minimal-api-lambda-container-image

First let's see what kind of objectives ASP.NET Core developers might have prior to investing their time and efforts into AWS serverless technology.