zeborg/kubekosh

KubeKosh is a self-hosted learning environment for Kubernetes, the system companies use to run and manage software across many computers at once. The idea is that you run a single command on your own machine and get a fully working Kubernetes cluster inside a container, along with a browser-based terminal and a set of guided exercises. No cloud account, no separate cluster setup, no complex installation. You start it with one Docker command and open a browser to a local address. After about 30 seconds the cluster is ready and you can begin working through exercises. The tool includes four learning tracks: Kubernetes basics, a track aimed at the Certified Kubernetes Administrator exam, one for the Certified Kubernetes Developer exam, and one focused on security. Each track has a timed exam mode if you want to simulate test conditions. The exercises come in two types. Task exercises give you a challenge to complete in the live terminal, then check whether the cluster is in the correct state when you click Validate. Multiple-choice questions ask you to pick an answer and show an explanation afterward. The terminal comes pre-loaded with short aliases for common commands so you spend less time typing. Under the hood everything runs in one Docker image. The frontend is built with React, the backend handles terminal connections over a protocol that keeps the session live in your browser, and the cluster itself is a lightweight version of Kubernetes called K3s. Progress is stored in a small database file you can mount to a folder on your own machine so it survives container restarts. The repository is open to contributions, particularly new exercises. There is a schema file explaining how to write tasks and multiple-choice questions, and the README walks through the full contribution workflow. The license is Apache 2.0.