Cannot run 64bit C# Azure Function on Azure Kubernetes Service

[SpicySyntax]

Please describe the documentation request or issue. Be as specific as possible.
I am working on an V2 Azure Function App that uses C# and .NET core that uses an x64 dll. For this reason I have set it up to only build and run as x64. I am able to run this function locally using 64 bit Azure Function Core tools and everything works as expected.

I deploy this to azure kubernetes using:
func deploy --platform kubernetes --name MyFunctionName --registry nickjpurcell
The deployment seems to succeed but when it has to run the code dependent on the x64 dll it fails.
I am ensuring we are publishing the project as x64 in the Dockerfile dotnet publish -p:Platform=x64 *.csproj --output /home/site/wwwroot.

Do I need to change the version of azure function I am using?
Is there a configuration I can do to switch the function runtime to use a 64 worker process?
(That is not the azure portal ui?)

Here is the gist containing the .csproj, Dockerfile, host.json for my Azure Function V2 project.

[fabiocav]

@ahmelsayed can you please comment on the configuration/support for running in 64-bit in AKS?

Fot the compilation/payload, you shouldn't need to target 64-bit specifically when compiling/publishing. A portable set of artifacts would work and the runtime would load the appropriate dependencies depending on the platform it's running under.

[ahmelsayed]

Do you know if that x64 dll contains native Windows code? I'm assuming locally you're running on Windows?

[SpicySyntax]

@ahmelsayed I am not 100% sure, but I think it might. (I am using 'CNTK.CPUOnly' and running on a Windows machine locally) In that case do I need to update my Dockerfile to build a windows container image?

[ahmelsayed]

As far as I know Windows containers on Kubernetes are still not available yet. Since their repo contains a mostly C++ code, I'm guessing that dll is a native Windows assembly and won't load on Linux. There seem to be a Linux build in their release https://github.com/Microsoft/CNTK/releases but the nuget package only contains Windows. See this issue: microsoft/CNTK#3472

They can either make a nuget package for Linux or include both Windows and Linux native assemblies into the nupkg like grpc for example, or have another Linux only nuget package.

Do you have a sample you can share using that package?

[ahmelsayed]

huh, looks like as of Kubernetes 1.14, released 10 days ago, Kubernetes works with Windows containers. Though both AKS and GKE don't have 1.14 yet.

[SpicySyntax]

@fabiocav @ahmelsayed This issue can be closed. It was not an issue with the bitness, which I was able to configure by changing the dotnet publish command to use x64 in the Dockerfile. It was the fact that I was trying to use Windows Native code in a Linux Container. So there is not really an issue with azure function core tools. Thanks for your help

[ahmelsayed]

Thanks for circling back @SpicySyntax!