.NET Docker configuration for multiple containers in a single repo with a dev configuration for debugging

README.md

This assumes the following structure:

Dockerfile
docker-compose.yml
src/
    - Api/
        - Api.csproj
    - Daemon/
        - Daemon.csproj

docker-compose.yml

version: '3.4'
services:
  web:
    build:
      context: .
      target: dev
      args:
        APP_SOURCE: Api
    environment:
      - SOME=var
    ports:
      - '8000:80'
    volumes:
      - ./src:/app/code
  daemon:
    build:
      context: .
      target: dev
      args:
        APP_SOURCE: Daemon
    links:
      - web
    environment:
      - SOME=var
    volumes:
      - ./src:/app/code

Dockerfile

FROM microsoft/dotnet:2.1.300-sdk as base

ARG APP_SOURCE

WORKDIR /app/code

COPY Directory.Build.props /app
COPY ./src/ /app/code/

RUN dotnet restore ./${APP_SOURCE}/${APP_SOURCE}.csproj

FROM base as dev
# Dev image defaults to recompiling and
# includes debug binaries to remotely attach
RUN apt-get update && \
    apt-get install -y unzip && \
    curl -sSL https://aka.ms/getvsdbgsh -o '/root/getvsdbg.sh' && \
    bash /root/getvsdbg.sh -v latest -l /vsdbg
WORKDIR /app/code
COPY --from=base /app/code .

CMD dotnet watch --project ./${APP_SOURCE}/${APP_SOURCE}.csproj run

FROM base as publisher
ARG APP_SOURCE
WORKDIR /app/code
COPY --from=base /app/code/ .
RUN dotnet publish \
    -c Release \
    --no-restore \
    -o out ./${APP_SOURCE}/${APP_SOURCE}.csproj

FROM microsoft/dotnet:2.1-aspnetcore-runtime as release
ARG APP_SOURCE
WORKDIR /app/code
COPY --from=publisher /app/code/${APP_SOURCE}/out .
ENTRYPOINT dotnet ${APP_SOURCE}.dll