k0s - The Zero Friction Kubernetes

Overview

k0s is an open source, all-inclusive Kubernetes distribution, which is configured with all of the features needed to build a Kubernetes cluster and packaged as a single binary for ease of use. Due to its simple design, flexible deployment options and modest system requirements, k0s is well suited for

• Any cloud
• Bare metal
• Edge and IoT

k0s drastically reduces the complexity of installing and running a CNCF certified Kubernetes distribution. With k0s new clusters can be bootstrapped in minutes and developer friction is reduced to zero. This allows anyone with no special skills or expertise in Kubernetes to easily get started.

k0s is distributed as a single binary with zero host OS dependencies besides the host OS kernel. It works with any Linux without additional software packages or configuration. Any security vulnerabilities or performance issues can be fixed directly in the k0s distribution that makes it extremely straightforward to keep the clusters up-to-date and secure.

Key Features

• Certified and 100% upstream Kubernetes
• Multiple installation methods: single-node, multi-node, airgap and Docker
• Automatic lifecycle management with k0sctl: upgrade, backup and restore
• Modest system requirements (1 vCPU, 1 GB RAM)
• Available as a single binary with no external runtime dependencies besides the kernel
• Flexible deployment options with control plane isolation as default
• Scalable from a single node to large, high-available clusters
• Supports custom Container Network Interface (CNI) plugins (Kube-Router is the default, Calico is offered as a preconfigured alternative)
• Supports custom Container Runtime Interface (CRI) plugins (containerd is the default)
• Supports all Kubernetes storage options with Container Storage Interface (CSI)
• Supports a variety of datastore backends: etcd (default for multi-node clusters), SQLite (default for single node clusters), MySQL, and PostgreSQL
• Supports x86-64, ARM64 and ARMv7
• Includes Konnectivity service, CoreDNS and Metrics Server

Getting Started

• Quick Start Guide for creating a full Kubernetes cluster with a single node.
• Install using k0sctl - Deploy and upgrade multi-node clusters with one command.
• Run k0s in Docker - Run k0s controllers and workers in containers.

Demo

Join the Community

• k8s Slack - Reach out for support and help from the k0s community.
• GitHub Issues - Submit your issues and feature requests via GitHub.

We welcome your help in building k0s! If you are interested, we invite you to check out the Contributing Guide and the Code of Conduct.

Community hours

We will be holding regular community hours. Everyone in the community is welcome to drop by and ask questions, talk about projects, and chat.

We currently have a monthly office hours call on the last Tuesday of the month.

To see the call details in your local timezone, check out https://dateful.com/eventlink/2735919704.

Adopters

k0s is used across diverse environments, from small-scale far-edge deployments to large data centers. Share your use case and add yourself to the list of adopters.

Commercial Support

Mirantis offers technical support, professional services and training for k0s. The support subscriptions include, for example, prioritized support (Phone, Web, Email) and access to verified extensions on top of your k0s cluster.

For any k0s inquiries, please contact us via email info@k0sproject.io.

Motivation

We have seen a gap between the host OS and Kubernetes that runs on top of it: How to ensure they work together as they are upgraded independent from each other? Who is responsible for vulnerabilities or performance issues originating from the host OS that affect the K8S on top?

→ k0s is fully self contained. It’s distributed as a single binary with no host OS deps besides the kernel. Any vulnerability or perf issues may be fixed in k0s Kubernetes.

We have seen K8S with partial FIPS security compliance: How to ensure security compliance for critical applications if only part of the system is FIPS compliant?

→ k0s core + all included host OS dependencies + components on top may be compiled and packaged as a 100% FIPS compliant distribution using a proper toolchain.

We have seen Kubernetes with cumbersome lifecycle management, high minimum system requirements, weird host OS and infra restrictions, and/or need to use different distros to meet different use cases.

→ k0s is designed to be lightweight at its core. It comes with a tool to automate cluster lifecycle management. It works on any host OS and infrastructure, and may be extended to work with any use cases such as edge, IoT, telco, public clouds, private data centers, and hybrid & hyper converged cloud applications without sacrificing the pure Kubernetes compliance or amazing developer experience.

Scope

While some Kubernetes distros package everything and the kitchen sink, k0s tries to minimize the amount of "add-ons" to bundle in. Instead, we aim to provide a robust and versatile "base" for running Kubernetes in various setups. Of course we will provide some ways to easily control and setup various "add-ons", but we will not bundle many of those into k0s itself. There are a couple of reasons why we think this is the correct way:

• Many of the addons such as ingresses, service meshes, storage etc. are VERY opinionated. We try to build this base with fewer opinions. :D
• Keeping up with the upstream releases with many external addons is very maintenance heavy. Shipping with old versions does not make much sense either.

With strong enough arguments we might take in new addons, but in general those should be something that are essential for the "core" of k0s.