Function in .Net 8 with in-process model failed to startup in Linux container hosted in AKS

[anupamk1506]

Is your question related to a specific version? If so, please specify:
.NET 8
dotnet-inproc
linux Container
AKS
V4

What language does your question apply to? (e.g. C#, JavaScript, Java, All)
C#

Question

We migrated the function to .Net 8 with in-process model using the steps mentioned in #9951 (comment).

It is working fine locally on windows machine with Visual studio. We deployed function in AKS with Linux containers using base image mcr.microsoft.com/azure-functions/dotnet:4.

The function is not working in AKS, we checked the pod logs where it shows it has issue with Startup.

We checked the application insights, where is shows : Error configuring services in an external startup class. Could not load file or assembly 'Microsoft.Extensions.Configuration.Abstractions, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

We tried downgrading the version and removing the package 'Microsoft.Extensions.Configuration.Abstractions. However it didn’t work. And got the same error.

The NuGet package used are :

We have added keys in local.setting.json and appsetting.json

The same function is working in .Net6 InProc and we are facing this issue after .Net8 upgrade to InProc.

This is blocker to us for our .Net 8 upgrade. Need help in resolving/investigation of this issue.

Let me know if you need more information.

Thanks!

[kshyju]

What is the HOST_VERSION environment variable value you are seeing in your container?

[anupamk1506]

What is the HOST_VERSION environment variable value you are seeing in your container?

@kshyju Currently we haven't set the HOST_VERSION environment variable in docker file

Do we require to add this for inproc function ? As per this thread Azure/azure-functions-docker#1105
HOST_VERSION should be set for isolated function for Open telemetry. Please suggest.

[kshyju]

The base image sets it. Run the container and you should be able to inspect the env variables.

[anupamk1506]

The base image sets it. Run the container and you should be able to inspect the env variables.

@kshyju , yes, I can this variable is being set when we build the docker image

At Pod level, I can see the variable HOST_VERSION is properly set

Do we need to override this? Please suggest

[kshyju]

I believe you are using an incorrect base image. @satvu Could you please point the image which supports in-proc net8 ?

[anupamk1506]

I believe you are using an incorrect base image. @satvu Could you please point the image which supports in-proc net8 ?

@kshyju Thanks for update. @satvu Can you please share image which supports in-proc net8?

[kshyju]

Please try mcr.microsoft.com/azure-functions/dotnet:4-dotnet8.0

[KlausHans]

I have the same problem and unfortunately mcr.microsoft.com/azure-functions/dotnet:4-dotnet8.0 didn't solved it for me. Any other ideas?