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.net core 5 docker following example not running – Debian

I followed the instructions I have found online and this is my dockerfile:

FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
WORKDIR /source

# copy csproj and restore as distinct layers
COPY *.csproj .
RUN dotnet restore

# copy and publish app and libraries
COPY . .
RUN dotnet publish -c release -o /app --no-restore

# final stage/image
FROM mcr.microsoft.com/dotnet/runtime:5.0
WORKDIR /app
COPY --from=build /app .
ENTRYPOINT ["my-app"]

I also have a .dockerignore because I was getting dir length exceeded errors:

Dockerfile
[b|B]in
[O|o]bj

When I try and run it I get this error stating that aspnetcore was not found:

It was not possible to find any compatible framework version
The framework 'Microsoft.AspNetCore.App', version '5.0.0' was not found.
  - No frameworks were found.

You can resolve the problem by installing the specified framework and/or SDK.

The specified framework can be found at:
  - https://aka.ms/dotnet-core-applaunch?framework=Microsoft.AspNetCore.App&framework_version=5.0.0&arch=x64&rid=debian.10-x64

Am I doing something wrong here?

Tags:

3

Answers


  1. 0

    Usually entry point looks like ENTRYPOINT ["dotnet", "my-app.dll"], not just ENTRYPOINT ["my-app"].

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  2. 0

    Except answer mentioned by @mtkachenko with incorrect entrypoint, you have aspnet app thus you need aspnet librariers. Instead of runtime image mcr.microsoft.com/dotnet/runtime:5.0 use mcr.microsoft.com/dotnet/aspnet:5.0.

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  3. 0

    Updating dockerfile to use FROM mcr.microsoft.com/dotnet/sdk:5.0 instead of FROM mcr.microsoft.com/dotnet/runtime:5.0 resolved the issue for me.

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