Cannot build docker container (ASP.NET Core)

Question

I have asp.net core solution, that contains 3 projects.

I want to deploy it to the docker container.

Here is how the solution looks like

Here is tree of solution

  TooSeeWeb
 |- aspnet-core(folder)
    |-TooSeeWeb (folder)
      |- TooSeeWeb.sln
      |-Dockerfile
      |- TooSeeWeb
         |- TooSeeWeb.csproj
      |- TooSeeWeb.Core(folder)
         |- TooSeeWeb.Core.csproj
      |- TooSeeWeb.Infrastructure(folder)
         |- TooSeeWeb.Infrastructure.csproj

Here is my dockerfile

   FROM mcr.microsoft.com/dotnet/core/sdk:2.2 AS build-env
WORKDIR /app

# Copy csproj and restore as distinct layers
COPY *.sln ./
COPY TooSeeWeb/*.csproj ./TooSeeWeb/
COPY TooSeeWeb.Core/*.csproj ./TooSeeWeb.Core/
COPY TooSeeWeb.Infrastructure/.*csproj ./TooSeeWeb.Infrastructure/
RUN dotnet restore

# Copy everything else and build
COPY . ./
RUN dotnet publish -c Release -o out

# Build runtime image
FROM mcr.microsoft.com/dotnet/core/aspnet:2.2
WORKDIR /app/TooSeeWeb
COPY --from=build-env /app/out .
ENTRYPOINT ["dotnet", "tooseeweb.dll"]

My problem, that when I try to do docker build - < Dockerfile

I got this error

Step 3/13 : COPY *.sln ./ COPY failed: no source files were specified

How I can fix this?

from where you start the build command ? maybe you should copy using TooSeeWeb/*.sln ? — LinPy
– LinPy, Commented Nov 6, 2019 at 8:38
the error indicate that *.sln return nothing, you need to double check that — LinPy
– LinPy, Commented Nov 6, 2019 at 8:40
I double-check it. with ls command in terminal. I see my .sln file @LinPy — Eugene Sukh
– Eugene Sukh, Commented Nov 6, 2019 at 8:43

Hans Kilian · Accepted Answer · 2019-11-06 09:05:16Z

1

When you use docker build - < Dockerfile, the local current directory isn't the directory you're running the command from.

You can see what the local directory is if you say COPY TooSeeWeb.sln ./ rather than *.sln. Then the error message will be something like COPY failed: stat /var/lib/docker/tmp/docker-builder87634958792798/TooSeeWeb.sln: no such file or directory.

If you instead use docker build . the local directory will be the directory you run the command from and your COPY command should work as expected.

edited Nov 6, 2019 at 9:05

answered Nov 6, 2019 at 8:59

Hans Kilian

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