Error when running in Docker The specified framework 'Microsoft.AspNetCore.App', version '2.1.6' was not found. on

Question

I try running a project with a GenericHost in docker. It works running the console app locally on my machine, and builds correctly. If I remove some code and the package Microsoft.AspNetCore.App it works good, so the issue seems to be isolated to that package when running it on Docker.

Error message:

It was not possible to find any compatible framework version
The specified framework 'Microsoft.AspNetCore.App', version '2.1.6' was not 
found.
- Check application dependencies and target a framework version installed at:
  /usr/share/dotnet/
- Installing .NET Core prerequisites might help resolve this problem:
  https://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409
- The .NET Core framework and SDK can be installed from:
  https://aka.ms/dotnet-download
The target process exited without raising a CoreCLR started event. Ensure that the target process is configured to use .NET Core. This may be expected if the target process did not run on .NET Core.
The program '[24] dotnet' has exited with code 150 (0x96).
The program 'dotnet' has exited with code 150 (0x96).

Below is my DockerFile:

FROM microsoft/dotnet:2.1-runtime AS base
WORKDIR /app

FROM microsoft/dotnet:2.1-sdk AS build
WORKDIR /src
COPY ../TestProj/TestProj.csproj ../TestProj/
RUN dotnet restore ../TestProj/TestProj.csproj
COPY . .
WORKDIR /src/../TestProj
RUN dotnet build TestProj.csproj -c Release -o /app

FROM build AS publish
RUN dotnet publish TestProj.csproj -c Release -o /app

FROM base AS final
WORKDIR /app
COPY --from=publish /app .
ENTRYPOINT ["dotnet", "TestProj.dll"]

The original Docker file includes some more "COPY" because of references needed, but edited those out here.

update Local machine:

dotnet --info
.NET Core SDKs installed:
1.1.9 [C:\Program Files\dotnet\sdk]
1.1.11 [C:\Program Files\dotnet\sdk]
2.1.201 [C:\Program Files\dotnet\sdk]
2.1.202 [C:\Program Files\dotnet\sdk]
2.1.300 [C:\Program Files\dotnet\sdk]
2.1.402 [C:\Program Files\dotnet\sdk]
2.1.500 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.All 2.1.0 [C:\Program 
Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.4 [C:\Program 
Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.6 [C:\Program     Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.0_old [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.4_old [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 1.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 1.0.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 1.1.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 1.1.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.0.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

On my local docker:

Host (useful for support):
Version: 2.1.6
Commit:  3f4f8eebd8

.NET Core SDKs installed:
No SDKs were found.

.NET Core runtimes installed:
Microsoft.NETCore.App 2.1.6 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

Answer 1

Apparently there was an issue if the project was created as a console application and use the nuget Microsoft.aspnetcore.app. I re-created the project but as a Web application and then it worked. Maybe it's obvious because it's a "web-nuget", but it didn't cross my mind.

I should note that I got some issues with the docker image, and had to pull the dotnet docker-image again with specific version.

docker pull microsoft/dotnet:2.1-aspnetcore-runtime

It wouldn't load/start with the correct dotnet version.