Visual Studio 2022 - .NET 5 프로젝트를 Docker Support로 실행했을 때 오류
이상하군요, 제목처럼 Visual Studio 2022에서 기본 상태의 Console App 프로젝트를 만들어 F5 키를 눌러 실행했더니 이런 오류가 발생합니다.
Debugging Error
Cannot find container to attach, check if the correct container is running or not.
이때 "Containers" 뷰에는 이런 오류 메시지가 나옵니다.
It was not possible to find any compatible framework version
The framework 'Microsoft.NETCore.App', version '6.0.0' was not found.
- The following frameworks were found:
5.0.17 at [/usr/share/dotnet/shared/Microsoft.NETCore.App]
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.NETCore.App&framework_version=6.0.0&arch=x64&rid=debian.10-x64
아니, 왜 .NET 5.0 프로젝트에서 6.0을 찾아 실행하려는 것일까요? ^^;
일단,
Visual Studio가 실행하는 docker run 명령어를,
docker run -dt -v "%USERPROFILE%\vsdbg\vs2017u5:/remote_debugger:rw" -v "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Sdks\Microsoft.Docker.Sdk\tools\linux-x64\net6.0:/VSTools:ro" -v "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\IDE\CommonExtensions\Microsoft\HotReload:/HotReloadAgent:ro" -v "C:\temp\test_dmp\test_dmp:/app:rw" -v "C:\temp\test_dmp:/src/:rw" -v "F:\nuget_root:/.nuget/fallbackpackages3:rw" -v "C:\Program Files (x86)\Microsoft Visual Studio\Shared\NuGetPackages:/.nuget/fallbackpackages:rw" -v "C:\Program Files\dotnet\sdk\NuGetFallbackFolder:/.nuget/fallbackpackages2:rw" -e "DOTNET_USE_POLLING_FILE_WATCHER=1" -e "NUGET_PACKAGES=/.nuget/fallbackpackages3" -e "NUGET_FALLBACK_PACKAGES=/.nuget/fallbackpackages;/.nuget/fallbackpackages2;/.nuget/fallbackpackages3" --name test_dmp --entrypoint dotnet testdmp:dev --roll-forward Major /VSTools/DistrolessHelper/DistrolessHelper.dll --wait
추려서 다음과 같이 /bin/bash로 실행해 봅니다.
c:\temp> docker run -v "%USERPROFILE%\vsdbg\vs2017u5:/remote_debugger:rw" -v "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Sdks\Microsoft.Docker.Sdk\tools\linux-x64\net6.0:/VSTools:ro" -v "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\IDE\CommonExtensions\Microsoft\HotReload:/HotReloadAgent:ro" -v "C:\temp\test_dmp\test_dmp:/app:rw" -v "C:\temp\test_dmp:/src/:rw" -v "F:\nuget_root:/.nuget/fallbackpackages3:rw" -v "C:\Program Files (x86)\Microsoft Visual Studio\Shared\NuGetPackages:/.nuget/fallbackpackages:rw" -v "C:\Program Files\dotnet\sdk\NuGetFallbackFolder:/.nuget/fallbackpackages2:rw" -e "DOTNET_USE_POLLING_FILE_WATCHER=1" -e "NUGET_PACKAGES=/.nuget/fallbackpackages3" -e "NUGET_FALLBACK_PACKAGES=/.nuget/fallbackpackages;/.nuget/fallbackpackages2;/.nuget/fallbackpackages3" -it --name test_dmp testdmp:dev /bin/bash
root@2e002735586d:/app#
그럼 dockerfile에 지정된 대로 runtime만 있는 상태이고, 실행까지 잘 됩니다.
# dotnet --list-sdks
# dotnet --list-runtimes
Microsoft.NETCore.App 5.0.17 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
# dotnet /app/bin/Debug/net5.0/test_dmp.dll
Hello World!
혹시나 싶어 Visual Studio가 실행하는 것과 동일한 명령어로 진행해도,
c:\temp\test_dmp> docker exec -it 2e002735586d dotnet /app/bin/Debug/net5.0/test_dmp.dll
Hello World!
What's next:
Try Docker Debug for seamless, persistent debugging tools in any container or image → docker debug 2e002735586d
Learn more at https://docs.docker.com/go/debug-cli/
역시나 잘 됩니다. ^^; 아니 도대체 뭐가 문제인 걸까요?
그런데, 가만 보니 "docker run" 시에 -v 볼륨으로 연결된 경로에 "net6.0"이 있습니다.
docker run -v "%USERPROFILE%\vsdbg\vs2017u5:/remote_debugger:rw" -v "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Sdks\Microsoft.Docker.Sdk\tools\linux-x64\net6.0:/VSTools:ro" ...[생략]... -it --name test_dmp testdmp:dev /bin/bash
실제로 "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Sdks\Microsoft.Docker.Sdk\tools\linux-x64" 경로를 보면, 하위에 "net6.0", "net7.0", "net8.0"만 있고 5.0 이하가 없습니다. 그러고 보니, "dotnet run" 시에 DistrolessHelper.dll을 실행하는 명령어가 있는데,
docker run -dt ...[생략]... --entrypoint dotnet testdmp:dev --roll-forward Major /VSTools/DistrolessHelper/DistrolessHelper.dll --wait
"--roll-forward Major"가 있다고 해도 저 명령어는 정상적으로 실행되지 않을 것입니다. 일례로 위에서 실행해 두었던 container에서 저 명령어를 실행해 보면,
# dotnet --roll-forward Major /VSTools/DistrolessHelper/DistrolessHelper.dll
It was not possible to find any compatible framework version
The framework 'Microsoft.NETCore.App', version '6.0.0' was not found.
- The following frameworks were found:
5.0.17 at [/usr/share/dotnet/shared/Microsoft.NETCore.App]
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.NETCore.App&framework_version=6.0.0&arch=x64&rid=debian.10-x64
정확히 동일한 오류가 발생합니다. 어쩌면 Visual Studio 입장에서 F5 디버깅 시에 중요한 것은 DistrolessHelper.dll의 실행 여부일 것입니다. 따라서 저것만 실행할 수 있다면 아마도 정상적으로 동작할 것 같은데요, 어쩔 수 없습니다. ^^; .NET 6를 함께 설치하는 수밖에!
따라서 Dockerfile에 다음과 같이 내용을 추가해,
#See https://aka.ms/customizecontainer to learn how to customize your debug container and how Visual Studio uses this Dockerfile to build your images for faster debugging.
FROM mcr.microsoft.com/dotnet/runtime:5.0 AS base
WORKDIR /app
RUN apt-get update && apt-get install -y --no-install-recommends clang zlib1g-dev wget ca-certificates
RUN wget https://packages.microsoft.com/config/ubuntu/18.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
RUN dpkg -i packages-microsoft-prod.deb
RUN rm packages-microsoft-prod.deb
RUN apt update && apt install -y dotnet-sdk-6.0
FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
ARG BUILD_CONFIGURATION=Release
WORKDIR /src
COPY ["test_dmp/test_dmp.csproj", "test_dmp/"]
RUN dotnet restore "./test_dmp/test_dmp.csproj"
COPY . .
WORKDIR "/src/test_dmp"
RUN dotnet build "./test_dmp.csproj" -c $BUILD_CONFIGURATION -o /app/build
FROM build AS publish
ARG BUILD_CONFIGURATION=Release
RUN dotnet publish "./test_dmp.csproj" -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "test_dmp.dll"]
다시 실행하면 정상적으로 .NET 5 앱에 대한 F5 디버깅이 가능합니다.
그렇다면 혹시, 우리가 만든 앱도 .NET 6 환경에서 실행하는 것은 아닐까요? 다행히 Debug 창을 보면,
------------------------------------------------------------------------------
You may only use the Microsoft Visual Studio .NET/C/C++ Debugger (vsdbg) with
Visual Studio Code, Visual Studio or Visual Studio for Mac software to help you
develop and test your applications.
------------------------------------------------------------------------------
Loaded '/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.17/System.Private.CoreLib.dll'. Symbol loading disabled by Include/Exclude setting.
Loaded '/app/bin/Debug/net5.0/test_dmp.dll'. Symbols loaded.
Loaded '/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.17/System.Runtime.dll'. Symbol loading disabled by Include/Exclude setting.
Loaded '/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.17/System.Console.dll'. Symbol loading disabled by Include/Exclude setting.
Loaded '/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.17/System.Threading.dll'. Symbol loading disabled by Include/Exclude setting.
Loaded '/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.17/System.Text.Encoding.Extensions.dll'. Symbol loading disabled by Include/Exclude setting.
Loaded '/usr/share/dotnet/shared/Microsoft.NETCore.App/5.0.17/Microsoft.Win32.Primitives.dll'. Symbol loading disabled by Include/Exclude setting.
정상적으로 5.0 프레임워크로 실행한 것을 확인할 수 있습니다.
[이 글에 대해서 여러분들과 의견을 공유하고 싶습니다. 틀리거나 미흡한 부분 또는 의문 사항이 있으시면 언제든 댓글 남겨주십시오.]