DotNet build CLI works in terminal, but not in Docker build

Question

This is my first atempt with both .net core and docker. I cant figure out whats wrong.

I can run dotnet restore / dotnet build / dotnet run in the terminal without any problem. The site loads up just fine. So I wanted to give docker a try (eventually running on VM in the cloud).

I run docker build -t latest . which results in:

Step 5 : RUN dotnet build
     ---> Running in e463aff85460
    Project app (.NETCoreApp,Version=v1.0) will be compiled because project is not safe for incremental compilation. Use --build-profile flag for more information.
    Compiling app for .NETCoreApp,Version=v1.0
    /app/project.json(32,58): error NU1001: The dependency Microsoft.EntityFrameworkCore.Sqlite >= 1.0.1 could not be resolved.

    Compilation failed.
        0 Warning(s)
        1 Error(s)

    Time elapsed 00:00:00.0174732

    The command 'dotnet build' returned a non-zero code: 1

I've tried changing the SQLite-version in project.json without any luck.

NuGet repos: Feeds used:

https://www.myget.org/F/aspnetcirelease/api/v3/index.json

https://api.nuget.org/v3/index.json

dotnet --version
1.0.0-preview3-003786

No edits to the dockerfile:

FROM microsoft/dotnet:latest

COPY . /app

WORKDIR /app

RUN ["dotnet", "restore"]

RUN ["dotnet", "build"]

EXPOSE 5000/tcp

CMD ["dotnet", "run", "--server.urls", "http://*:5000"]

Tried creating a .dockerignore after some Googling without any luck:

.git
Dockerfile
.DS_Store
.gitignore
README.md
project.lock.json

Im on latest macOS (10.12).

package.json:

{
  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.1",
      "type": "platform"
    },
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.1",
    "Microsoft.AspNetCore.Razor.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.AspNetCore.Routing": "1.0.1",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Configuration.CommandLine": "1.0.0",
    "Microsoft.Extensions.Logging": "1.0.0",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.Extensions.Logging.Debug": "1.0.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0",
    "Microsoft.EntityFrameworkCore": "1.0.1",
    "Microsoft.EntityFrameworkCore.Design": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.EntityFrameworkCore.Relational": "1.0.1",
    "Microsoft.EntityFrameworkCore.SQLite": "1.0.1",
    "Microsoft.EntityFrameworkCore.Sqlite.Design": "1.0.1"
  },

  "tools": {
    "BundlerMinifier.Core": "2.0.238",
    "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  },

  "frameworks": {
    "netcoreapp1.0": {
      "imports": [
        "dotnet5.6",
        "portable-net45+win8"
      ]
    }
  },

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "**/*.cshtml",
      "appsettings.json",
      "web.config"
    ]
  },

  "scripts": {
    "precompile": [ "dotnet bundle" ],
    "prepublish": [ "bower install" ],
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  },

  "tooling": {
    "defaultNamespace": "MyFirstApp"
  }
}

Output after trying to build docker container:

Sending build context to Docker daemon 26.39 MB
Step 1 : FROM microsoft/dotnet:latest
 ---> 96d122fe36cb
Step 2 : WORKDIR /root
 ---> Using cache
 ---> 0c5317108a5b
Step 3 : COPY bin/Debug/netcoreapp1.0/publish/ /root/
 ---> Using cache
 ---> d79700fa6c36
Step 4 : ENTRYPOINT dotnet /root/MyProject.dll
 ---> Using cache
 ---> a99f30826ddd
Successfully built a99f30826ddd

Answer 1

The image microsoft/dotnet:latest is not designed for build but only for runtime.

The best way to publish .net core application into the docker is:

1. dotnet restore
2. dotnet publish

3. docker build -t your-tag with Dockerfile like:

   FROM microsoft/dotnet:latest
   WORKDIR /root
   COPY bin/Debug/netcoreapp1.0/publish/ /root/
   ENTRYPOINT dotnet /root/[your-project-name].dll
   

   where bin/Debug/netcoreapp1.0/publish is your real publish path.

In case you want build .net core app in docker use this image:

FROM microsoft/dotnet:onbuild

The differences between image versions are explained here

Regards