LinuxKit, a toolkit for building custom minimal, immutable Linux distributions.
- Secure defaults without compromising usability
- Everything is replaceable and customisable
- Immutable infrastructure applied to building Linux distributions
- Completely stateless, but persistent storage can be attached
- Easy tooling, with easy iteration
- Built with containers, for running containers
- Designed for building and running clustered applications, including but not limited to container orchestration such as Docker or Kubernetes
- Designed from the experience of building Docker Editions, but redesigned as a general-purpose toolkit
- Designed to be managed by external tooling, such as Infrakit or similar tools
- Includes a set of longer-term collaborative projects in various stages of development to innovate on kernel and userspace changes, particularly around security
LinuxKit currently supports the x86_64
, arm64
, and s390x
architectures on a variety of platforms, both as virtual machines and baremetal (see below for details.
- LinuxKit kubernetes aims to build minimal and immutable Kubernetes images. (previously
projects/kubernetes
in this repository). - LinuxKit LCOW LinuxKit images and utilities for Microsoft's Linux Containers on Windows.
- linux A copy of the Linux stable tree with branches LinuxKit kernels.
- virtsock A
go
library and test utilities forvirtio
and Hyper-V sockets. - rtf A regression test framework used for the LinuxKit CI tests (and other projects).
LinuxKit uses the linuxkit
tool for building, pushing and running VM images.
Simple build instructions: use make
to build. This will build the tool in bin/
. Add this
to your PATH
or copy it to somewhere in your PATH
eg sudo cp bin/* /usr/local/bin/
. Or you can use sudo make install
.
If you already have go
installed you can use go get -u github.com/linuxkit/linuxkit/src/cmd/linuxkit
to install the linuxkit
tool.
On MacOS there is a brew tap
available. Detailed instructions are at linuxkit/homebrew-linuxkit,
the short summary is
brew tap linuxkit/linuxkit
brew install --HEAD linuxkit
Build requirements from source:
- GNU
make
- Docker
- optionally
qemu
Once you have built the tool, use
linuxkit build linuxkit.yml
to build the example configuration. You can also specify different output formats, eg linuxkit build -format raw-bios linuxkit.yml
to
output a raw BIOS bootable disk image, or linuxkit build -format iso-efi linuxkit.yml
to output an EFI bootable ISO image. See linuxkit build -help
for more information.
Since linuxkit build
is built around the Moby tool the input yml files are described in the Moby tool documentation.
You can use linuxkit run <name>
or linuxkit run <name>.<format>
to
execute the image you created with linuxkit build <name>.yml
. This
will use a suitable backend for your platform or you can choose one,
for example VMWare. See linuxkit run --help
.
Currently supported platforms are:
- Local hypervisors
- HyperKit (macOS)
[x86_64]
- Hyper-V (Windows)
[x86_64]
- qemu (macOS, Linux, Windows)
[x86_64, arm64, s390x]
- VMware (macOS, Windows)
[x86_64]
- HyperKit (macOS)
- Cloud based platforms:
- Amazon Web Services
[x86_64]
- Google Cloud
[x86_64]
- Microsoft Azure
[x86_64]
- OpenStack
[x86_64]
- Amazon Web Services
- Baremetal:
- packet.net
[x86_64, arm64]
- Raspberry Pi Model 3b
[arm64]
- packet.net
The test suite uses rtf
To
install this you should use make bin/rtf && make install
. You will
also need to install expect
on your system as some tests use it.
To run the test suite:
cd test
rtf -v run -x
This will run the tests and put the results in a the _results
directory!
Run control is handled using labels and with pattern matching. To run add a label you may use:
rtf -v -l slow run -x
To run tests that match the pattern linuxkit.examples
you would use the following command:
rtf -v run -x linuxkit.examples
To customise, copy or modify the linuxkit.yml
to your own file.yml
or use one of the examples and then run linuxkit build file.yml
to
generate its specified output. You can run the output with linuxkit run file
.
The yaml file specifies a kernel and base init system, a set of containers that are built into the generated image and started at boot time. You can specify the type
of artifact to build with the moby
tool eg linuxkit build -format vhd linuxkit.yml
.
If you want to build your own packages, see this document.
The yaml format specifies the image to be built:
kernel
specifies a kernel Docker image, containing a kernel and a filesystem tarball, eg containing modules. The example kernels are built fromkernel/
init
is the baseinit
process Docker image, which is unpacked as the base system, containinginit
,containerd
,runc
and a few tools. Built frompkg/init/
onboot
are the system containers, executed sequentially in order. They should terminate quickly when done.services
is the system services, which normally run for the whole time the system is upfiles
are additional files to add to the image
For a more detailed overview of the options see yaml documentation
There is an overview of the architecture covering how the system works.
There is an overview of the security considerations and direction covering the security design of the system.
This project was extensively reworked from the code we are shipping in Docker Editions, and the result is not yet production quality. The plan is to return to production quality during Q3 2017, and rebase the Docker Editions on this open source project during this quarter. We plan to start making stable releases on this timescale.
This is an open project without fixed judgements, open to the community to set the direction. The guiding principles are:
- Security informs design
- Infrastructure as code: immutable, manageable with code
- Sensible, secure, and well-tested defaults
- An open, pluggable platform for diverse use cases
- Easy to use and participate in the project
- Built with containers, for portability and reproducibility
- Run with system containers, for isolation and extensibility
- A base for robust products
There are weekly development reports summarizing work carried out in the week.
See FAQ.
Released under the Apache 2.0 license.