- Platform-Distro Compatibility Matrix
The Kata Containers runtime creates a virtual machine (VM) to isolate a set of container workloads. The VM requires a guest kernel and a guest operating system ("guest OS") to boot and create containers inside the guest environment.
This repository contains tools to create a guest OS disk image.
This section describes the terms used for all documentation in this repository.
The root filesystem or "rootfs" is a slight misnomer as it is not a true filesystem. It is a tree of files contained in a particular directory, which represents the root disk layout. A rootfs can be turned into either an image or an initrd.
See the rootfs creation section.
"Guest OS" (or "Guest Image")
A "virtual disk" or "disk image" built from a rootfs. It contains a filesystem that is used by the VM, in conjunction with a guest kernel, to create an environment to host the container. Neither the guest OS nor the guest kernel need to be the same as the host operating system.
See the image creation section.
initrd (or "initramfs")
cpio(1)archive, created from a rootfs which is loaded into memory and used as part of the Linux startup process. During startup, the kernel unpacks it into a special instance of a
tmpfsthat becomes the initial root filesystem.
See the initrd creation section.
A particular version of a Linux distribution used to create a rootfs from.
Makefile contains an example of how to use the available components.
By default, components will run on the host system. However, some components
offer the ability to run from within Docker (for ease of setup) by setting the
For more detailed information, consult the documentation for a particular component.
This section shows how to build a basic rootfs using the default distribution. For further details, see the rootfs builder documentation.
Rootfs with systemd as init
$ sudo -E PATH=$PATH make USE_DOCKER=true rootfs
Rootfs with the agent as init
$ sudo -E PATH=$PATH make USE_DOCKER=true AGENT_INIT=yes rootfs
This section shows how to create an image from the already-created rootfs. For further details, see the image builder documentation.
Image with systemd as init
$ sudo -E PATH=$PATH make USE_DOCKER=true image
Image with the agent as init
$ sudo -E PATH=$PATH make USE_DOCKER=true AGENT_INIT=yes image
To create an initrd from the already-created rootfs with the agent acting as the init daemon:
$ sudo -E PATH=$PATH make AGENT_INIT=yes initrd
For further details, see the initrd builder documentation.
$ make test
For further details, see the tests documentation.
Platform-Distro Compatibility Matrix