Help needed running a .NET Core website on a Raspberry Pi 4

General Discussions
1

Hi, I have created a .NET Core 5.0 website and setup Docker on my Raspberry Pi 4. I have definitely setup Docker correctly because I have spun up a test site using the following command below and confirmed in a browser that it loaded ok.

docker run -it --rm -p 8000:80 --name aspnetcore_sample mcr.microsoft.com/dotnet/samples:aspnetapp

So its down to my project file or docker file being incorrect. Here’s my project file:

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
    <ApplicationIcon />
    <OutputType>Exe</OutputType>
    <StartupObject></StartupObject>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
    <PackageReference Include="System.Runtime.Caching" Version="6.0.0" />
  </ItemGroup>
</Project>

Here’s my Docker file that I run on my Pi:


FROM mcr.microsoft.com/dotnet/sdk:5.0 as builder
ENV DOTNET_CLI_TELEMETRY_OPTOUT 1

RUN mkdir -p /var/ww/Scott/Dan1
WORKDIR /var/ww/Scott

COPY ./FootballData.csproj ./Dan1
WORKDIR /var/ww/Scott/Dan1

RUN dotnet restore ./FootballData.csproj  
RUN dotnet publish -c release -o published -r linux-arm --self-contained

FROM mcr.microsoft.com/dotnet/runtime:5.0.13-bullseye-slim-arm32v7

EXPOSE 500

WORKDIR /root/  
COPY --from=builder /var/ww/Scott/Dan1/published .

CMD ["dotnet", "./FootballData.dll"]

This is the command that I am running:
sudo docker build -t dangermouse50/footballdata:0.1 .

For this, I receive the following error:

Restored /var/ww/Scott/Dan1/FootballData.csproj (in 29.74 sec).
CSC : error CS5001: Program does not contain a static 'Main' method suitable for an entry point [/var/ww/Scott/Dan1/FootballData.csproj]

I have also tried amending the start up project to the only project in my solution and then I receive this error:

Restored /var/ww/Scott/Dan1/FootballData.csproj (in 31.74 sec).
CSC : error CS1555: Could not find 'FootballData.Program' specified for Main method [/var/ww/Scott/Dan1/FootballData.csproj]

Hopefully this is close to being setup but I can’t complete this last step, it’s killing me. Can somebody please help?

3

I resolved this by running the dotnet build and dotnet publish on the pi itself then simplifying the docker file by stripping almost everything out apart from the FROM, COPY, WORKDIR and ENTRYPOINT commands