Gist related to the blogpost on upgrading to Alpine based docker image

CoreMVC.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
    <RuntimeFrameworkVersion>2.1.0-preview1-25919-02</RuntimeFrameworkVersion>
    <!--<RuntimeIdentifiers>win8-x64;ubuntu.16.10-x64;osx.10.12-x64</RuntimeIdentifiers>-->
  </PropertyGroup>

  <ItemGroup>
    <Compile Remove="releaseOutput\**" />
    <Content Remove="releaseOutput\**" />
    <EmbeddedResource Remove="releaseOutput\**" />
    <None Remove="releaseOutput\**" />
  </ItemGroup>

  <ItemGroup>
    <None Remove="Properties\PublishProfiles\FolderProfile.pubxml" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.0" />
  </ItemGroup>

  <PropertyGroup>
  <PublishWithAspNetCoreTargetManifest>false</PublishWithAspNetCoreTargetManifest>
</PropertyGroup>

  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0" />
  </ItemGroup>

  <ItemGroup>
    <Folder Include="Properties\PublishProfiles\" />
  </ItemGroup>

</Project>

CoreWebAPI.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <!-- <TargetFramework>netcoreapp2.0</TargetFramework> -->
  <TargetFramework>netcoreapp2.1</TargetFramework>
    <RuntimeFrameworkVersion>2.1.0-preview1-25919-02</RuntimeFrameworkVersion>
  </PropertyGroup>

  <PropertyGroup>
    <PublishWithAspNetCoreTargetManifest>false</PublishWithAspNetCoreTargetManifest>
  </PropertyGroup>

  <ItemGroup>
    <Folder Include="wwwroot\" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.0" />
  </ItemGroup>

  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0" />
  </ItemGroup>

</Project>

CoreWebAPIDockerfile

FROM microsoft/dotnet-nightly:2.1-sdk AS build-env

WORKDIR /MyFirstCoreWebApi

COPY *.csproj ./
COPY NuGet.config ./
RUN dotnet restore

COPY . ./
RUN dotnet publish -c Release -o releaseOutput --no-restore

#build runtime image
FROM microsoft/dotnet-nightly:2.1-runtime-alpine

WORKDIR /MyFirstCoreWebApi

COPY --from=build-env /MyFirstCoreWebApi/releaseOutput ./

EXPOSE 8080

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

CoreWebApiProgram.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace CoreWebAPI
{
    public class Program
    {
        public static void Main(string[] args)
        {
            BuildWebHost(args).Run();
        }

        public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseUrls("http://*:8080")
                .UseStartup<Startup>()
                .Build();
    }
}

MVCDockerfile

FROM microsoft/dotnet-nightly:2.1-sdk AS build-env

WORKDIR /MyFirstMvcCoreApp

COPY *.csproj ./
COPY NuGet.config ./
RUN dotnet restore

COPY . ./
RUN dotnet publish -c Release -o releaseOutput --no-restore

#build runtime image
FROM microsoft/dotnet-nightly:2.1-runtime-alpine

WORKDIR /MyFirstMvcCoreApp

COPY --from=build-env /MyFirstMvcCoreApp/releaseOutput ./

EXPOSE 80

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

MVCProgram.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace CoreMVC
{
    public class Program
    {
        public static void Main(string[] args)
        {
            BuildWebHost(args).Run();
        }

        public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseUrls("http://*:80")
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseStartup<Startup>()
                .Build();
    }
}