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Using Docker for your Workflow

This doc will cover the usage of Docker images and containers for your builds.

Docker Basics

First, you have to enable and install the Docker Engine. Follow the instructions in their official site in this link if you haven't done so.

When using Docker, your machine's OS is strictly speaking not terribly important. For example, if you are on Ubuntu 22.04, you can use the Ubuntu 18.04 image without any issues whatsoever. Likewise, you can run Linux images on Windows if you have WSL enabled. If you followed the instructions from the Docker official website when installing the engine, you most likely have it already up and running. If not, you can follow the instructions in this link to enable it. However, note that you can't run multiple OS's on the same Docker Daemon, as it takes resources from the underlying kernel as needed. In other words, you can run either Linux on WSL, or Windows containers. You have to switch between them if you need both, and restart Docker.

The target architecture is more important to consider when using Docker containers. The image's architecture has to match your machine's supported platforms. For instance, you can run both, x64 and Arm64 images on an Apple Silicon Mac, thanks to the Rosetta x64 emulator it provides. Likewise, you can run Linux Arm32 images on a Linux Arm64 host.

Note that while Docker uses WSL to run the Linux containers on Windows, you don't have to boot up a WSL terminal to run them. Any cmd or powershell terminal with the docker command available will suffice to run all the commands. Docker takes care of the rest.

The Official Runtime Docker Images

In the following tables, you will find the full names with tags of the images used for the official builds.

Main Docker Images

The main Docker images are the most commonly used ones, and the ones you will probably need for your builds. If you are working with more specific scenarios (e.g. Android, Risc-V), then you will find the images you need in the Extended Docker Images table right below this one.

Host OS Target OS Target Arch Image crossrootfs dir
Azure Linux (x64) Alpine 3.13 x64 mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-amd64-alpine /crossrootfs/x64
Azure Linux (x64) Ubuntu 16.04 x64 mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-amd64 /crossrootfs/x64
Azure Linux (x64) Alpine 3.13 Arm32 (armhf) mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-arm-alpine /crossrootfs/arm
Azure Linux (x64) Ubuntu 22.04 Arm32 (armhf) mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-arm /crossrootfs/arm
Azure Linux (x64) Alpine 3.13 Arm64 (arm64v8) mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-arm64-alpine /crossrootfs/arm64
Azure Linux (x64) Ubuntu 16.04 Arm64 (arm64v8) mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-arm64 /crossrootfs/arm64
Azure Linux (x64) Ubuntu 16.04 x86 mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-x86 /crossrootfs/x86

Extended Docker Images

Host OS Target OS Target Arch Image crossrootfs dir
Azure Linux (x64) Android Bionic x64 mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-android-amd64 N/A
Azure Linux (x64) Android Bionic (w/OpenSSL) x64 mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-android-openssl N/A
Azure Linux (x64) Android Bionic (w/Docker) x64 mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-android-docker N/A
Azure Linux (x64) FreeBSD 13 x64 mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-freebsd-13 /crossrootfs/x64
Azure Linux (x64) Ubuntu 18.04 PPC64le mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-ppc64le /crossrootfs/ppc64le
Azure Linux (x64) Ubuntu 24.04 RISC-V mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-riscv64 /crossrootfs/riscv64
Azure Linux (x64) Ubuntu 18.04 S390x mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-s390x /crossrootfs/s390x
Azure Linux (x64) Ubuntu 16.04 (Wasm) x64 mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-webassembly-amd64 /crossrootfs/x64
Debian (x64) Debian 12 x64 mcr.microsoft.com/dotnet-buildtools/prereqs:debian-12-gcc14-amd64 N/A
Ubuntu (x64) Tizen 9.0 Arm32 (armel) mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-cross-armel-tizen /crossrootfs/armel
Ubuntu (x64) Ubuntu 20.04 Arm32 (v6) mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-20.04-cross-armv6-raspbian-10 /crossrootfs/armv6

Build the Repo

Once you've chosen the image that suits your needs, you can issue docker run with the necessary arguments to use your clone of the runtime repo, and call the build scripts as you need. Down below, we have a small command-line example, explaining each of the flags you might need to use:

docker run --rm \
  -v <RUNTIME_REPO_PATH>:/runtime \
  -w /runtime \
  mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-amd64 \
  ./build.sh --subset clr --configuration Checked

Now, dissecting the command:

  • --rm: Erase the created container after it finishes running.
  • -v <RUNTIME_REPO_PATH>:/runtime: Mount the runtime repo clone located in <RUNTIME_REPO_PATH> to the container path /runtime.
  • -w /runtime: Start the container in the /runtime directory.
  • mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-amd64: The fully qualified name of the Docker image to download. In this case, we want to use an Azure Linux image to target the x64 architecture.
  • ./build.sh --subset clr --configuration Checked: The build command to run in the repo. In this case, we want to build the Clr subset in the Checked configuration.

You might also want to interact with the container directly for a myriad of reasons, like running multiple builds in different paths for example. In this case, instead of passing the build script command to the docker command-line, pass the flag -it. When you do this, you will get access to a small shell within the container, which allows you to explore it, run builds manually, and so on, like you would on a regular terminal in your machine. Note that the containers' shell's built-in tools are very limited in comparison to the ones you probably have on your machine, so don't expect to be able to do full work there.

To do cross-building using Docker, make sure to select the appropriate image that targets the platform you want to build for. As for the commands to run, follow the same instructions from the cross-building doc over here, with the difference that you don't need to generate the ROOTFS, as the cross-building images already include it.