.Net core docker build with multiple projects

Question

Net core project and I have many webapi, business layer and some other layers here. Below is the folder stucture.

Main Solution

1. businessLayer
2. data layer
3. Web API layer 3.1 MyDockerFile

Below is my docker file.

FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build-env
WORKDIR /app

COPY ["Enrichment.WebApi/Enrichment.WebApi.csproj", "Enrichment.WebApi/"]
COPY ["Enrichment.Facade/Enrichment.Facade.csproj", "Enrichment.Facade/"]
COPY ["Enrichment.Saga/Enrichment.Saga.csproj", "Enrichment.Saga/"]
COPY ["Enrichment.BusinessModel/Enrichment.BusinessModel.csproj", "Enrichment.BusinessModel/"]
RUN dotnet restore "Enrichment.WebApi/Enrichment.WebApi.csproj"

COPY *.csproj ./
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:3.1
WORKDIR /app
COPY --from=build-env /app/out .
ENTRYPOINT ["dotnet", "Enrichment.WebApi.dll"]

When I run docker build -t enrichment.webapi . I get below output

Sending build context to Docker daemon  230.8MB
Step 1/16 : FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build-env
 ---> 9a88f73dec65
Step 2/16 : WORKDIR /app
 ---> Using cache
 ---> 9b50f1fc6721
Step 3/16 : COPY ["Enrichment.WebApi/Enrichment.WebApi.csproj", "Enrichment.WebApi/"]
COPY failed: stat /var/lib/docker/tmp/docker-builder437963979/Enrichment.WebApi/Enrichment.WebApi.csproj: no such file or directory

I am not able to understand why I am getting above error. Path looks like incorrect but I am not able to understand what would be the right path. can someone help me to understand any issue here. Any help would be appreciated. Thank you.

Answer 1

Step 9/16 : COPY *.csproj ./ COPY failed: no source files were specified

This is because of .dockerignore file that ignores the csproj . Notice the content of .dockerignore below and Anything other than obj/Docker/publish/* and obj/Docker/empty is ignored.

*
!obj/Docker/publish/*
!obj/Docker/empty/

Incude this in your dockerfile

# build runtime image
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1 
WORKDIR /app
COPY --from=build-env /app/out ./