KraftKit provides a suite of tools and Go-based framework for building custom, minimal, immutable lightweight unikernel virtual machines based on Unikraft: a fast, secure and open-source library operating system.
With KraftKit, you can easily leverage Unikraft and manage specialized, high-performance applications at every stage of their lifecycle: from construction to production.
- Getting started guide 📖
- Key differences between containers and unikernels 🤔
#kraftkiton Unikraft's Community Discord 👾
There are many benefits in running your application as a unikernel: for more information about the performance of unikernels 🚀, the added security 🔒 and a positive impact on the environment 🌱 please check out Unikraft's documentation and the introductory chapters on these impacts
- 🔥 Native Firecracker MicroVM support;
- 📚 Pre-built unikernel app catalog;
- 🤹♀️ Daemonless unikernel VM instance manager;
- 📦 OCI packaging and distribution support;
- 🚜 ELF binary / POSIX-compatibility support;
- 🧰 Go SDK for building unikernels programmatically; and
- 🚀 much more!
You can quickly and easily install KraftKit using the interactive installer. Simply run the following command to get started:
curl --proto '=https' --tlsv1.2 -sSf https://get.kraftkit.sh | sh
Alternatively, you can download the binaries from the releases pages.
Container build environment
KraftKit ships a container build environment which you can use instead of installing any dependencies directly on your host.
It includes the
kraft binary as well as all the additional tools and libraries for building Unikraft unikernels.
Simply attach a working directory on your host as a mount path volume mapped to
docker run -it --rm -v $(pwd):/workspace --entrypoint bash kraftkit.sh/base:latest
The above command will drop you into a container shell.
exit or Ctrl+D to quit.
Running unikernels with
kraft is designed to be simple and familiar.
To test your installation of
kraft, you can run the following:
kraft run unikraft.org/helloworld:latest
Building unikernels is also designed to be simple. You can find some common project examples below:
|Simple "Hello, world!" application written in C|
|Simple "Hello, world!" application written in C++|
|Simple Flask 3.0 HTTP Web Server|
|Simple Python 3.10 HTTP Web Server with
Use in GitHub Actions
KraftKit can be used to automatically build your application into a unikernel in a GitHub Actions workflow, simply
In the following example, a repository that has been initialized with a top-level
Kraftfile that contains a target for qemu/x86_64 will be built every time a PR is opened, synchronized or re-opened:
name: example on: pull_request: types: [opened, synchronize, reopened] jobs: build: steps: - uses: actions/checkout@v4 - uses: unikraft/kraftkit@staging with: workdir: . kraftfile: Kraftfile arch: x86_64 plat: qemu
For other CI's and integrations, including GitLab, check out the getting started guide.
Support, Community & Meetings
If you have any further questions or need more information about KraftKit or Unikraft, please refer to the official Unikraft documentation or ask for help on the Unikraft community forum.
KraftKit is part of the Unikraft OSS Project and licensed under