Public | Automated Build

Last pushed: a month ago
Short Description
Official images for building ASP.NET Core applications.
Full Description

ASP.NET Core Build Docker Image

This repository contains images that are used to compile/publish ASP.NET Core applications inside the container. This is different to compiling an ASP.NET Core application and then adding the compiled output to an image, which is what you would do when using the microsoft/aspnetcore image. These Dockerfiles use the microsoft/dotnet image as its base.

Latest images for 2.1 and newer are now available on microsoft/dotnet. See this link for more details about migrating to 2.1.

The .NET Core Docker samples show various ways to use .NET Core and Docker together. See Building Docker Images for .NET Core Applications to learn more.

Linux amd64 tags

Windows Server 2016 amd64 tags

Note: In images tagged with two versions in this pattern A.B.C-X.Y.Z, the first version A.B.C represents the .NET Core runtime version, and the second X.Y.Z represents the .NET Core SDK version.

What is ASP.NET Core?

ASP.NET Core is a new open-source and cross-platform framework for building modern cloud based internet connected applications, such as web apps, IoT apps and mobile backends. It consists of modular components with minimal overhead, so you retain flexibility while constructing your solutions. You can develop and run your ASP.NET Core apps cross-platform on Windows, Mac and Linux. ASP.NET Core is open source at GitHub.

This image contains:

  • .NET Core SDK so that you can create, build and run your .NET Core applications.
  • A NuGet package cache for the ASP.NET Core libraries. This will significantly improve the initial package restore performance when building ASP.NET Core application.
  • Node.js
  • Bower
  • Gulp

Related images

  • microsoft/aspnetcore - the ASP.NET Core runtime image, for when you don't need to build inside a container.

Example Usage

Build an app with docker build

With this technique your application is compiled in two stages when you run docker build. Docker 17.05 or newer is required.

Stage 1 compiles and publishes the application by using the microsoft/aspnetcore-build image. Stage 2 copies the published application
from Stage 1 into the final image leaving behind all of the source code and tooling needed to build.

  1. Create a .dockerignore file in your project folder and exclude files that shouldn't be copied into the container:

     # Sample contents of .dockerignore file
  2. Create a Dockerfile in your project:

     # Sample contents of Dockerfile
     # Stage 1
     FROM microsoft/aspnetcore-build AS builder
     WORKDIR /source
     # caches restore result by copying csproj file separately
     COPY *.csproj .
     RUN dotnet restore
     # copies the rest of your code
     COPY . .
     RUN dotnet publish --output /app/ --configuration Release
     # Stage 2
     FROM microsoft/aspnetcore
     WORKDIR /app
     COPY --from=builder /app .
     ENTRYPOINT ["dotnet", "myapp.dll"]

    This approach has the advantage of caching the results of dotnet restore so that packages are not downloaded unless you change your
    project file.

  3. Build your image:

     $ docker build -t myapp .
  4. (Linux containers) Start a container from your image. This will expose port 5000 so you can browse it locally at http://locahost:5000.

     $ docker run -it -p 5000:80 myapp
  5. (Windows containers) Start a container from your image, get its assigned IP address, and then open your browser to the IP address
    of the container on port 80. To see console output, attach to the running container or use docker logs.

     PS> docker run --detach --name myapp_container myapp
     PS> docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' myapp_container
     PS> docker attach myapp_container

Build an app with docker run

You can use this container to compile your application when it runs. If you use the Visual Studio tooling to setup CI/CD to Azure Container Service then this method of using the build container is used.

Run the build container, mounting your code and output directory, and publish your app:

docker run -it -v $(PWD):/app --workdir /app microsoft/aspnetcore-build bash -c "dotnet publish -c Release -o ./bin/Release/PublishOutput"

After this is completed, the application in the current directory will be published to the bin/Release/PublishOutput directory.

Docker Pull Command
Source Repository