Run Asp Core MVC on Docker - the static files / wwwroot files are not loading

Question

When I start my container, the page starts without styles, scripts, images and other static files - calls to load them return 404.

I would like to say that when I access the app folder, the wwwroot folder exists.

I tested it in my Release folder (with dotnet command). But in Docker it does not work. Yes, I'm using UseStaticFiles in my Startup class.

My Dockerfile is simple, it just runs the app. But I previously built and published the app, and the wwwroot is there.

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1
WORKDIR /app
EXPOSE 80
EXPOSE 443

COPY bin/Release app/

ENTRYPOINT ["dotnet", "app/MyApp.SGC.Site.dll"]

The application runs, but there are many erros:

Can someone help me?

Answer 1

You must run the dotnet publish command so that all the required files are copied into your app folder.

Your release folder only has the dll files for your application so when you copy it into the docker container the wwwroot files are not copied.

If you create a new web app project and tick the Docker support option it will make a dockerfile for you. Create a sample project so you can see the recommended way to containerize your application.

Here is an example that uses the publish command:

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
COPY ["MyApp.SGC.Site/MyApp.SGC.Site.csproj", "MyApp.SGC.Site/"]
RUN dotnet restore "MyApp.SGC.Site/MyApp.SGC.Site.csproj"
COPY . .
WORKDIR "/src/MyApp.SGC.Site"
RUN dotnet build "MyApp.SGC.Site.csproj" -c Release -o /app/build

FROM build AS publish
# publish will copy wwwroot files as well
RUN dotnet publish "MyApp.SGC.Site.csproj" -c Release -o /app/publish
WORKDIR /app/publish

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