The k0sproject/k0s repository hosts k0s, an open source, all-inclusive Kubernetes distribution designed to minimize friction in deploying, managing, and operating Kubernetes clusters. k0s is engineered to be simple, lightweight, and flexible, making it suitable for a wide range of environments including public and private clouds, bare metal, edge computing, and IoT deployments. Its primary goal is to reduce the complexity traditionally associated with Kubernetes installation and lifecycle management, enabling users of all skill levels to quickly bootstrap clusters and maintain them with minimal effort.
A standout feature of k0s is its packaging as a single binary, which eliminates the need for external runtime dependencies beyond the host OS kernel. This approach ensures compatibility with any Linux distribution and simplifies updates and security maintenance, as vulnerabilities or performance issues can be addressed directly within the k0s distribution. The modest system requirements (1 vCPU and 1 GB RAM) further enhance its accessibility, allowing it to run on resource-constrained devices as well as large-scale infrastructure.
k0s is certified and fully compliant with upstream Kubernetes, ensuring users benefit from the latest features and standards. It supports multiple installation methods, including single-node, multi-node, airgap, and Docker-based deployments. Lifecycle management is streamlined through k0sctl, a tool that automates upgrades, backups, and restores, making cluster maintenance straightforward. The distribution is scalable, supporting everything from single-node setups to high-availability clusters with control plane isolation by default.
Networking and storage are highly customizable in k0s. It supports custom Container Network Interface (CNI) plugins, with Kube-Router as the default and Calico as a preconfigured alternative. Container Runtime Interface (CRI) plugins are also supported, with containerd as the default runtime. Storage options are flexible, leveraging the Container Storage Interface (CSI) to support a variety of backends. For data storage, k0s offers multiple options: etcd (default for multi-node clusters), SQLite (default for single-node clusters), MySQL, and PostgreSQL. Additional integrated services include Konnectivity for controller-worker communication, CoreDNS for service discovery, and Metrics Server for resource monitoring.
k0s is designed to be a robust and versatile base for Kubernetes, intentionally minimizing bundled add-ons to avoid opinionated defaults and reduce maintenance overhead. Instead, it provides mechanisms for users to easily control and set up add-ons as needed. The project is actively developed and ready for production use, with regular releases and a strong focus on stability and user feedback.
Building k0s from source is straightforward, relying on GNU Make, a POSIX shell, coreutils, findutils, and Docker. Compilation steps are performed within Docker containers, so no Go installation is required unless running smoke tests. The build system supports parallel builds and offers flexibility for package maintainers who may wish to provide binaries separately.
The k0s community is active and welcoming, offering support via Slack, GitHub Issues, and regular community hours. The project encourages contributions and maintains a code of conduct to foster a collaborative environment. k0s is adopted across diverse environments, from small edge deployments to large data centers, reflecting its versatility and reliability.
