asp.net core 2.0 - multiple projects solution docker file

Question

[asp.net core 2.0 and docker for linux]

I am completely new to docker and trying to figure out how to use docker in a case where i have a solution with 2 projects. All tutorials i've seen show with single project.

So, if someone could show step by step solution i would really appreciate it.

i have a solution structure like:

Solution.sln
|______WebAPIProject.csproj
|______ClassLibraryProject.csproj

In Visual studio, i've added docker support to solution and got these files:

Under WebAPIProject, it created this Docker file:

FROM microsoft/aspnetcore:2.0
ARG source
WORKDIR /app
EXPOSE 80
COPY ${source:-obj/Docker/publish} .
ENTRYPOINT ["dotnet", "WebAPIProject.dll"]

then, under separate docker-compose 'project' i've got:

docker-compose.ci.build.yml

version: '3'

services:
  ci-build:
    image: microsoft/aspnetcore-build:1.0-2.0
    volumes:
      - .:/src
    working_dir: /src
    command: /bin/bash -c "dotnet restore ./Solution.sln && dotnet publish ./Solution.sln -c Release -o ./obj/Docker/publish"

and docker.compose.yml file

version: '3'

services:
  WebAPIProject:
    image: WebAPIProject
    build:
      context: ./WebAPIProject
      dockerfile: Dockerfile

I am sure its something trivial with paths but i am just pretty lost with it all so if someone could shed a bit of a light on it?

Answer 1

While I understand that dotnet core isn't specific to Windows and not everyone is going to be using Visual Studio, there's this neat feature that Microsoft has included inside Visual Studio (Tried it in 2017).

1. Right click on the Web Project.
2. Select Add.
3. Then "Docker Support". This will automatically fetch multiple projects into the container.

If you have multiple Web Projects, repeat the step individually for each.

Here's the reference: https://learn.microsoft.com/en-us/aspnet/core/host-and-deploy/docker/visual-studio-tools-for-docker?view=aspnetcore-2.1#existing-app

If you happen to run with any issues when running the Docker container, try deselecting Hyper-V Services in "Windows Features" (Search for Windows Features in Start Menu), selecting again, and then restarting your computer. Check here.

Answer 2

I finally found a way how to built solutions with docker.

IMPORTANT: For this to work, you have to put the Dockerfile file into the same location where the solution file is

I've just created a docker file with the following content:

FROM microsoft/aspnetcore:2.0 AS base
WORKDIR /app
EXPOSE 80

FROM microsoft/aspnetcore-build:2.0 AS build
WORKDIR /src
COPY Solution.sln ./
COPY ClassLibraryProject/*.csproj ./ClassLibraryProject/
COPY WebAPIProject/*.csproj ./WebAPIProject/

RUN dotnet restore
COPY . .
WORKDIR /src/ClassLibraryProject
RUN dotnet build -c Release -o /app

WORKDIR /src/WebAPIProject
RUN dotnet build -c Release -o /app

FROM build AS publish
RUN dotnet publish -c Release -o /app

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

Note that I think you may have to respect project build dependencies but I don't know really.

Sample call to build:

sudo docker build --no-cache -t webapi:dev .

Sample call to run:

sudo docker run -d=false -p 8080:80 --name webapi webapi:dev

Hope that helps.

Answer 3

I had the same problem and all other solutions didn't fit my so I worked out my own. I feel that bellow steps are legible, but if you're new to Docker, I explained it line by line in my blog post dedicated to new Docker users (so you could understand precisely what is going on in this Dockerfile).

1. Keep Dockerfile in project directory (which is, in my point of view, better than keeping it next to solution file, because you can have more than one Docker image per solution).

2. Configure Dockerfile as follows:

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

COPY . ./
RUN dotnet publish PROJECT_NAME -c Release -o out

FROM mcr.microsoft.com/dotnet/core/aspnet:2.2
WORKDIR /app
COPY --from=build-env /app/PROJECT_NAME/out .

ENTRYPOINT ["dotnet", "PROJECT_NAME.dll"]

3. Move .dockerignore file to solution directory - that's required, because Docker CLI takes .dockerignore file only from root directory of the build context (as documentation says), but it's also convenient, because you have one, common set of ignore rules for all projects (similar to .gitignore file), which is easier to maintain.

4. Run build command from solution directory, pointing to Dockerfile in project directory, and setting current directory (.) as build context (to have access to all projects):

docker build -f PROJECT_DIRECTORY/Dockerfile -t IMAGE_NAME .

5. Run container as usual, for example:

docker run -d -p 8080:80 --name my-app-name IMAGE_NAME

Answer 4

This links to an amazing post about how to tackle this issue.

He mentions putting all your code in a src directory. I didn't so that, and this is the file i came up with: (The key is the for file part. I'm sure it's not the best dockerfile otherwise; tips are welcome.)

FROM microsoft/dotnet:2.2-aspnetcore-runtime-stretch-slim AS base
WORKDIR /app
EXPOSE 5000

FROM microsoft/dotnet:2.2-sdk-stretch AS build
WORKDIR /src

COPY ./*.sln ./

COPY */*.csproj ./
RUN for file in $(ls *.csproj); do mkdir -p ${file%.*} && mv $file ${file%.*}; done
RUN dotnet restore

COPY . ./
RUN dotnet build -c Release -o /app

FROM build AS publish
RUN dotnet publish -c Release -o /app

FROM base AS final
WORKDIR /app
COPY --from=publish /app .

ENV ASPNETCORE_URLS="http://*:5000"
ENTRYPOINT ["dotnet", "PersonalSiteApi.dll"]

Answer 5

As of 2022 docker-compose 3.9

After few attempts, I managed to do it this way:

Project hierarchy:

MoulaTracker/
|- MoulaTracker.Core/    # <- PROJECT 1
|- MoulaTracker.Api/     # <- PROJECT 2
|- Dockerfile.Core
|- Dockerfile.Api
|- docker-compose.yml
|- MoulaTracker.sln

The project MoulaTracker.Api is dependent of MoulaTracker.Core

docker-compose.yml:

version: "3.9"

services:
  moula-tracker-core:
    build:
      context: .
      dockerfile: ./Dockerfile.Core
  moula-tracker-api:
    build:
      context: .
      dockerfile: ./Dockerfile.Api

Dockerfile.Api:

FROM mcr.microsoft.com/dotnet/core/sdk:3.1.409 AS build-env

# Copy csproj and restore as distinct layers
WORKDIR /MoulaTracker.Api
COPY ./MoulaTracker.Api .
COPY ./MoulaTracker.Core ../MoulaTracker.Core
RUN dotnet restore

RUN dotnet publish -c Release -o out

# Build runtime image
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1.0 AS runtime

WORKDIR /MoulaTracker.Api
COPY --from=build-env /MoulaTracker.Api/ ./

ENTRYPOINT ["dotnet", "out/MoulaTracker.Api.dll"]

Answer 6

FROM microsoft/dotnet:sdk AS build-env
WORKDIR /app

RUN mkdir /output

# Copy project and publish

COPY . /app

WORKDIR /app/YourProjectName
RUN dotnet publish --configuration Debug --output /output

# Build runtime image
FROM microsoft/dotnet:aspnetcore-runtime

ENV ASPNETCORE_URLS http://*:5001

WORKDIR /app

COPY --from=build-env /output .
EXPOSE 5001

ENTRYPOINT ["dotnet", "YourProjectName.dll"]

This is a Docker configuration that worked for me. This was an ASP.NET Core 2 WebApi project with many child project references.

Then run it using  docker run -d -p 8080:5001 --name some-name yourpojectname

Hope this helpes someone.

Answer 7

1. Install docker desktop as administrator
2. Run Docker desktop as administrator
3. Move your sln file to projects folders (project folder level)
4. right click to projects go to Add option -> Docker support -> Container Orchestrator Support and choose linux OS and click OK
5. it will generated DockerFile and docker composer files
6. open cmd as administrator and go to sln file path
7. run docker-compose build
8. after docker-compose up