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feat: rebrand to RootNode Academy + add Real Ops scenario bundle

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- Rename app title, header, tagline, footer, terminal tab to RootNode Academy
- Apply RootNode color palette (#39FF14 green, #00D4FF blue, GitHub-style darks)
- Add rootnode-runaway-monitor scenario (homelab NOC incident: oversized memory request)
- Add rootnode-real-ops bundle in terminal-green accent
- Update package name to rootnode-academy-ui
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ced4568
2026-06-21 03:27:46 -05:00
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commit f7cdb48833
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README.md
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@@ -1,28 +1,41 @@
<div align="center"> <div align="center">
<img src="frontend/public/logo.svg" alt="KubeKosh Logo" width="100" />
<h1>KubeKosh</h1> <img src="frontend/public/logo.svg" alt="KubeKosh" height="96" />
<p><strong>Self-hosted Kubernetes Lab for Hands-on Learning</strong></p> # KubeKosh — RootNode Academy Edition
**A browser-based Kubernetes lab for hands-on learners.**
Real K3s. Real `kubectl`. Instant validation. No cloud account, no local cluster.
[![License](https://img.shields.io/badge/license-Apache%202.0-blue?style=flat-square)](LICENSE)
[![Platforms](https://img.shields.io/badge/platforms-amd64%20%7C%20arm64-lightgrey?style=flat-square)](#)
[![Kubernetes](https://img.shields.io/badge/Kubernetes-K3s-326CE5?style=flat-square&logo=kubernetes&logoColor=white)](https://k3s.io)
[![Docker](https://img.shields.io/badge/Docker-required-2496ED?style=flat-square&logo=docker&logoColor=white)](https://docs.docker.com/get-docker/)
[![Maintained by ced4568](https://img.shields.io/badge/maintained%20by-ced4568-181717?style=flat-square&logo=github)](https://github.com/ced4568)
<p>
<a href="https://hub.docker.com/r/zeborg/kubekosh"><img src="https://img.shields.io/docker/pulls/zeborg/kubekosh?style=flat-square&logo=docker&label=Docker%20Hub" alt="Docker Hub" /></a>
<img src="https://img.shields.io/badge/license-Apache%202.0-blue?style=flat-square" alt="License" />
<img src="https://img.shields.io/badge/platforms-amd64%20%7C%20arm64-lightgrey?style=flat-square" alt="Platforms" />
</p>
</div> </div>
--- ---
KubeKosh runs a real [K3s](https://k3s.io/) Kubernetes cluster inside a single Docker container and pairs it with a browser-based terminal and automated scenario validation — no cloud account or local cluster required. > **Attribution.** This is a branded, modified fork of the excellent
> [`zeborg/kubekosh`](https://github.com/zeborg/kubekosh), licensed under Apache 2.0.
> RootNode Academy adds custom scenarios, branding, and multi-student deployment tooling on
> top of the upstream project. Original copyright and license notices are preserved in
> [`LICENSE`](LICENSE). Modified files are marked per Apache 2.0 §4. Full credit to
> the original author for the core platform.
## Screenshots ---
| | | | ## What It Is
|---|---|---|
| ![Scenario browser with live terminal](screenshots/1.png) | ![Task scenario with problem statement](screenshots/2.png) | ![Contextual hints with copy-ready commands](screenshots/3.png) | KubeKosh runs a real single-node [K3s](https://k3s.io) cluster inside one Docker
| ![Automated validation — all checks passed](screenshots/4.png) | ![Exam mode — start with custom duration and scenario count](screenshots/5.png) | ![Exam mode — live exam with timer](screenshots/6.png) | container and pairs it with a browser terminal and automated scenario validation.
| ![Exam MCQ — selecting an answer](screenshots/7.png) | ![Exam MCQ — correct answer with explanation](screenshots/8.png) | ![Exam history with per-scenario score report](screenshots/9.png) | A learner opens a tab, gets a live cluster, runs real `kubectl`, and clicks **Validate**
to check their work against actual cluster state.
In the RootNode Academy curriculum this is the **capstone rung** — the Kubernetes & DevOps
track that sits on top of the Linux / Git / Docker foundations. It is aimed at the
advanced learner (roughly 14+), not the absolute beginner.
--- ---
@@ -31,23 +44,25 @@ KubeKosh runs a real [K3s](https://k3s.io/) Kubernetes cluster inside a single D
**Prerequisite:** [Docker](https://docs.docker.com/get-docker/) **Prerequisite:** [Docker](https://docs.docker.com/get-docker/)
```bash ```bash
docker run -itd --name kubekosh --privileged -p 7554:80 zeborg/kubekosh:latest docker run -itd --name kubekosh --privileged -p 7554:80 ced4568/kubekosh:latest
``` ```
Open **http://localhost:7554** — wait ~30 seconds for the *Cluster Ready* indicator to turn green. Open **http://localhost:7554** and wait ~30s for the *Cluster Ready* indicator to turn green.
> `--privileged` is required — K3s needs access to kernel namespaces and cgroups. > `--privileged` is required — K3s needs kernel namespaces and cgroups.
> **Do not expose this container directly to the public internet.** It is a teaching
> **Security Warning:** Do **not** expose this container publicly. Use it only on your local machine as it is meant for educational purposes only. > sandbox. Multi-student exposure is handled by the deployment layer below, not by
> publishing the raw container.
### Persist Progress ### Persist Progress
```bash ```bash
docker run -itd --name kubekosh --privileged -p 7554:80 \ docker run -itd --name kubekosh --privileged -p 7554:80 \
-v <your_custom_directory>:/data zeborg/kubekosh:latest -v <host_dir>:/data ced4568/kubekosh:latest
``` ```
Progress is stored in SQLite at `/data/progress.db` inside the container. Mount a local directory to `/data` to keep progress across container restarts. Progress is stored in SQLite at `/data/progress.db`. Mount a host directory to `/data`
to keep progress across restarts — one volume per student.
### Build From Source ### Build From Source
@@ -62,53 +77,72 @@ docker buildx build --platform linux/amd64,linux/arm64 -t kubekosh .
## What's Inside ## What's Inside
| Bundle | Focus | Exam Mode | | Bundle | Focus | Exam Mode |
|---|---|---| | ------ | ----- | --------- |
| 🌱 Kubernetes Basics | Core concepts | 60 min | | 🌱 Kubernetes Basics | Core concepts | 60 min |
| 🧑‍✈️ Kubernetes Administrator | CKA | 120 min | | 🧑‍✈️ Kubernetes Administrator | CKA | 120 min |
| 🛠️ Kubernetes Developer | CKAD | 120 min | | 🛠️ Kubernetes Developer | CKAD | 120 min |
| 🛡️ Kubernetes Security | CKS | 120 min | | 🛡️ Kubernetes Security | CKS | 120 min |
**Scenario types:** **Scenario types**
- **Task** — Hands-on challenge in the live terminal. Click **Validate** for automated cluster-state checking.
- **MCQ** — Multiple-choice question with a detailed explanation on submission.
### Shell Aliases - **Task** — hands-on challenge in the live terminal; **Validate** auto-checks cluster state.
- **MCQ** — multiple choice with a detailed explanation on submission.
The terminal comes pre-configured with: Custom RootNode Academy scenarios live alongside upstream ones in `scenarios/data/` and are
grouped into bundles in `scenarios/bundles/`. See [`scenarios/SCHEMA.md`](scenarios/SCHEMA.md).
| Alias | Expands to |
|---|---|
| `k` | `kubectl` |
| `kg` | `kubectl get` |
| `kd` | `kubectl describe` |
| `krm` | `kubectl delete` |
| `kgp` | `kubectl get pods` |
| `kga` | `kubectl get pods --all-namespaces` |
| `kgd` | `kubectl get deployments` |
| `kgs` | `kubectl get services` |
| `kgn` | `kubectl get nodes` |
| `kgns` | `kubectl get namespaces` |
| `kdp` | `kubectl describe pod` |
| `kaf` | `kubectl apply -f` |
| `kdf` | `kubectl delete -f` |
| `kex` | `kubectl exec -it` |
| `klogs` | `kubectl logs` |
| `kns <ns>` | `kubectl config set-context --current --namespace=<ns>` |
| `kctx <ctx>` | `kubectl config use-context <ctx>` |
--- ---
## Architecture ## Architecture
| Component | Technology | ```mermaid
|---|---| flowchart TD
| Frontend | React + Vite, `xterm.js` | subgraph Container["Single Docker Image (--privileged)"]
| Backend | Node.js / Express, `node-pty` WebSocket PTY | NGINX["nginx :80 — reverse proxy"]
| Cluster | K3s (single-node, in-container) | FE["Frontend<br/>React + Vite + xterm.js"]
| Proxy | nginx on container port `80`, mapped to host port `7554` | BE["Backend<br/>Node / Express + node-pty (WebSocket PTY)"]
| Storage | SQLite (`better-sqlite3`) at `/data/progress.db` | K3S["K3s<br/>single-node in-container cluster"]
DB[("SQLite<br/>/data/progress.db")]
Everything runs inside a **single Docker image** managed by `scripts/entrypoint.sh`. NGINX --> FE
NGINX --> BE
BE -->|kubectl / PTY| K3S
BE --> DB
end
Student["Learner browser"] -->|:7554| NGINX
```
| Component | Technology |
| --------- | ---------- |
| Frontend | React + Vite, `xterm.js` |
| Backend | Node.js / Express, `node-pty` WebSocket PTY |
| Cluster | K3s (single-node, in-container) |
| Proxy | nginx on port `80`, mapped to host `7554` |
| Storage | SQLite (`better-sqlite3`) at `/data/progress.db` |
Everything runs inside one image managed by `scripts/entrypoint.sh`.
---
## Multi-Student Deployment (RootNode Academy addition)
The upstream project assumes one learner, one container. RootNode Academy runs it across three
delivery modes. **Never publish the raw privileged container** — front it with isolation.
| Mode | Provisioning | Isolation |
| ---- | ------------ | --------- |
| In-person camp | Pre-spun container per seat, torn down after | Lab VLAN, no public ingress |
| Live cohort | Container per enrolled student for the session window | Per-student auth at the proxy |
| Self-paced | On-demand spin-up per session, idle-timeout teardown | Per-user volume + auth + resource limits |
Hardening checklist for shared infra:
- One container **per student** — never share a cluster between learners.
- Apply CPU/memory limits so one runaway pod can't starve a host.
- Put authentication in front (proxy-level), never expose `:7554` to the internet.
- Persist each student's `/data` to a dedicated volume.
- Idle-timeout + auto-teardown for self-paced sessions to control cost.
--- ---
@@ -116,88 +150,42 @@ Everything runs inside a **single Docker image** managed by `scripts/entrypoint.
``` ```
scenarios/ scenarios/
├── data/ # One JSON file per scenario -> <scenario-id>.json ├── data/ # one JSON file per scenario -> <scenario-id>.json
├── bundles/ # One JSON file per bundle -> <bundle-id>.json ├── bundles/ # one JSON file per bundle -> <bundle-id>.json
└── SCHEMA.md # Full schema reference └── SCHEMA.md # full schema reference
backend/ backend/ server.js # Express API + WebSocket PTY
└── server.js # Express API + WebSocket PTY frontend/ src/ # React + Vite SPA
scripts/ entrypoint.sh # container startup (k3s -> API -> nginx)
frontend/ nginx.conf # reverse-proxy config
└── src/ # React + Vite SPA
scripts/
├── entrypoint.sh # Container startup (k3s -> API -> nginx)
└── nginx.conf # Reverse-proxy config
``` ```
--- ---
## Contributing ## Authoring Scenarios
Contributions are what make open-source projects like this one grow — and every contribution counts, big or small. Whether you're fixing a typo, polishing a scenario description, or building a completely new exercise from scratch, you're helping the next person learn Kubernetes in the best way possible. **Thank you for taking the time!** Each scenario is one JSON file in `scenarios/data/`; each bundle is one JSON file in
`scenarios/bundles/`. See [`scenarios/SCHEMA.md`](scenarios/SCHEMA.md) for the full schema.
### Adding Scenarios **Task checklist**
- `validation.commands` — idempotent `kubectl` only
- `setup_commands` / `teardown_commands` — `kubectl` or native Ubuntu only
Each scenario is a single JSON file in `scenarios/data` directory; each bundle is a single JSON file in `scenarios/bundles` directory. See [`scenarios/SCHEMA.md`](scenarios/SCHEMA.md) for the full schema. **MCQ checklist**
- `correct_option` must match an `options[].id`
- always include an `explanation`
**Task checklist:** Hot-reload while authoring (no rebuild):
- `validation.commands` — idempotent `kubectl` commands only
- `setup_commands` / `teardown_commands` — `kubectl` or native Ubuntu commands only
**MCQ checklist:**
- `correct_option` must match one of the `options[].id` values
- Always include an `explanation`
### In-Memory Cache & Hot Reloading
To ensure high performance and zero disk-I/O bottlenecking, scenarios and bundles are cached in memory on backend startup. When developing or updating scenarios, you can hot-reload the definitions without rebuilding the image or restarting the container:
1. **Mount Scenarios Directory:** Run the container with the local `scenarios/` directory mounted to `/app/scenarios`:
```bash
docker run --rm -itd --privileged -p 7554:80 --name kubekosh -v <path_to_scenarios_directory>:/app/scenarios zeborg/kubekosh:latest
```
2. **Reload Cache:** Click the **Reload Scenario Cache** (↻) button in the top right corner of the header in the web user interface, or send an API request:
```bash
curl -X POST http://localhost:7554/api/cache/reload
```
> **NOTE:**
> The content in `<path_to_scenarios_directory>` should be the path to the local `scenarios/` directory of the cloned repository with your updates, i.e., it should contain the updated `scenarios/data` and `scenarios/bundles` directories.
### Workflow
```bash ```bash
# 1. Fork the repo on GitHub, then clone your fork docker run --rm -itd --privileged -p 7554:80 --name kubekosh \
git clone https://github.com/<your-username>/kubekosh.git -v $PWD/scenarios:/app/scenarios ced4568/kubekosh:latest
cd kubekosh curl -X POST http://localhost:7554/api/cache/reload
# 2. Create a branch
git checkout -b feat/my-scenario
# 3. Add a new scenario file (copy an existing scenario as a template or create a new one)
cp scenarios/data/deploy-nginx.json scenarios/data/my-new-scenario.json
vim scenarios/data/my-new-scenario.json # edit the new scenario as per [SCHEMA.md](scenarios/SCHEMA.md)
# 4. Add the scenario ID to the relevant bundle
vim scenarios/bundles/k8s-basics.json # edit the bundle to include the new scenario ID
# 5. Build and test locally
# Run the built container directly:
docker build -t kubekosh . && docker run --rm -itd --privileged -p 7554:80 --name kubekosh kubekosh
# Or mount the scenarios folder for hot-reloading:
docker run --rm -itd --privileged -p 7554:80 -v $PWD/scenarios:/app/scenarios --name kubekosh zeborg/kubekosh:dev
# 6. Commit and push to your fork (example for adding `my-new-scenario` to `k8s-basics` bundle)
git add scenarios/data/my-new-scenario.json scenarios/bundles/k8s-basics.json
git commit -m "feat: add my-new-scenario to k8s-basics bundle"
git push -u origin feat/my-new-scenario
``` ```
Open a Pull Request from your fork's branch against `main`.
--- ---
## License ## License
Apache 2.0 License — see [LICENSE](LICENSE). Apache 2.0 — see [`LICENSE`](LICENSE). Original work © the `zeborg/kubekosh` authors.
Modifications © RootNode Academy / Chase Dumphord (ced4568).
frontend/index.html
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<head> <head>
<meta charset="UTF-8" /> <meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>KubeKosh — Interactive Kubernetes Playground</title> <title>RootNode Academy — Build From the Root</title>
<link rel="icon" type="image/svg+xml" href="/logo.svg" /> <link rel="icon" type="image/svg+xml" href="/logo.svg" />
<link rel="preconnect" href="https://fonts.googleapis.com"> <link rel="preconnect" href="https://fonts.googleapis.com">
<link href="https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Epilogue:wght@400;500;600;700;800;900&display=swap" rel="stylesheet"> <link href="https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Epilogue:wght@400;500;600;700;800;900&display=swap" rel="stylesheet">
frontend/package.json
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@@ -1,5 +1,5 @@
{ {
"name": "kubekosh-ui", "name": "rootnode-academy-ui",
"version": "0.1.0", "version": "0.1.0",
"private": true, "private": true,
"scripts": { "scripts": {
frontend/src/App.jsx
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@@ -410,9 +410,9 @@ export default function App() {
)} )}
<footer className={styles.footer}> <footer className={styles.footer}>
<div>&copy; {new Date().getFullYear()} The KubeKosh Project &bull; All rights reserved</div> <div>&copy; {new Date().getFullYear()} RootNode Academy &bull; All rights reserved</div>
<div> <div>
Made with <span className={styles.heart}>❤️</span> by <a href="https://github.com/zeborg" target="_blank" rel="noopener noreferrer" className={styles.footerLink}>zeborg</a> Built on the open-source <a href="https://github.com/zeborg/kubekosh" target="_blank" rel="noopener noreferrer" className={styles.footerLink}>KubeKosh</a> project by zeborg
</div> </div>
</footer> </footer>
</div> </div>
frontend/src/components/Header.jsx
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@@ -98,18 +98,18 @@ export default function Header({ clusterReady, onShowHistory }) {
<header className={styles.header}> <header className={styles.header}>
<div className={styles.brand}> <div className={styles.brand}>
<div className={styles.logo}> <div className={styles.logo}>
<img src="/logo.svg" alt="KubeKosh Logo" className={styles.logoImage} /> <img src="/logo.svg" alt="RootNode Academy Logo" className={styles.logoImage} />
<span className={styles.logoText}>KubeKosh</span> <span className={styles.logoText}>RootNode Academy</span>
<span className={styles.version}>{import.meta.env.VITE_APP_VERSION}</span> <span className={styles.version}>{import.meta.env.VITE_APP_VERSION}</span>
</div> </div>
<span className={styles.tagline}>Interactive Kubernetes Playground</span> <span className={styles.tagline}>Build From the Root</span>
</div> </div>
<div className={styles.right}> <div className={styles.right}>
{/* GitHub link */} {/* GitHub link */}
<div className={styles.githubBtnContainer}> <div className={styles.githubBtnContainer}>
<a <a
href="https://github.com/zeborg/kubekosh" href="https://github.com/ced4568/kubekosh"
target="_blank" target="_blank"
rel="noopener noreferrer" rel="noopener noreferrer"
className={styles.githubBtn} className={styles.githubBtn}
frontend/src/components/Terminal.jsx
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@@ -147,7 +147,7 @@ export default function TerminalComponent({ collapsed, onToggleCollapse }) {
</div> </div>
<span className={styles.barTitle}> <span className={styles.barTitle}>
<span className={styles.barIcon}>$_</span> <span className={styles.barIcon}>$_</span>
bash — kubekosh bash — rootnode
</span> </span>
</div> </div>
<div className={styles.barRight}> <div className={styles.barRight}>
frontend/src/index.css
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@@ -2,17 +2,17 @@
/* ── Dark theme (default) ────────────────────────────────────────────────── */ /* ── Dark theme (default) ────────────────────────────────────────────────── */
:root { :root {
--bg: #0c0f14; --bg: #0D1117;
--surface: #131720; --surface: #161B22;
--surface2: #1a2030; --surface2: #1C232E;
--surface3: #212840; --surface3: #232C3A;
--border: #252d42; --border: #21262D;
--border2: #2e3a55; --border2: #30363D;
--green: #39d98a; --green: #39FF14;
--green-dim: rgba(57,217,138,0.12); --green-dim: rgba(57,255,20,0.12);
--blue: #4dabf7; --blue: #00D4FF;
--blue-dim: rgba(77,171,247,0.10); --blue-dim: rgba(0,212,255,0.10);
--amber: #fcc419; --amber: #fcc419;
--amber-dim: rgba(252,196,25,0.10); --amber-dim: rgba(252,196,25,0.10);
--red: #ff6b6b; --red: #ff6b6b;
@@ -22,9 +22,9 @@
--teal: #2dd4bf; --teal: #2dd4bf;
--teal-dim: rgba(45,212,191,0.11); --teal-dim: rgba(45,212,191,0.11);
--text: #e2e8f4; --text: #E6EDF3;
--text-2: #8899b8; --text-2: #8B949E;
--text-3: #4d5f80; --text-3: #586069;
--mono: 'IBM Plex Mono', monospace; --mono: 'IBM Plex Mono', monospace;
--sans: 'Epilogue', sans-serif; --sans: 'Epilogue', sans-serif;
scenarios/bundles/rootnode-real-ops.json
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@@ -0,0 +1,13 @@
{
"id": "rootnode-real-ops",
"name": "RootNode: Real Ops",
"icon": "🌳",
"tagline": "Real-world cluster failures, drawn from a working homelab NOC.",
"color": "#39FF14",
"colorDim": "rgba(57,255,20,0.12)",
"exam_minutes": 60,
"scenario_ids": [
"rootnode-runaway-monitor",
"broken-deployment"
]
}
scenarios/data/rootnode-runaway-monitor.json
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@@ -0,0 +1,58 @@
{
"id": "rootnode-runaway-monitor",
"title": "Recover the Monitoring Stack",
"category": "Observability & Ops",
"difficulty": "Medium",
"type": "task",
"weight": 8,
"description": "## Recover the Monitoring Stack\n\nA monitoring agent named `node-metrics` was deployed to the `monitoring` namespace, but its pod never came up. Right now it's stuck **Pending**.\n\nThis is modeled on a real homelab incident: a monitoring component requested far more memory than any node could give it. In production that same class of mistake — an unbounded or oversized monitoring workload — is a classic way to exhaust a node and take the *whole observability stack* down with it.\n\n**Your task:** Diagnose why the pod won't schedule, then **right-size** the resource request so the deployment reaches **1/1 Ready**.\n\n> Important: the goal is to *right-size* the request, not to delete resource governance entirely. A monitoring workload with no requests at all is how you got here in the first place — it should still declare a sane memory request.",
"hints": [
{
"title": "1. See the failure",
"body": "List pods in the monitoring namespace. You'll see node-metrics stuck Pending. Describe the pod and read the Events at the bottom — the scheduler tells you exactly why it can't place the pod.",
"command": "kubectl get pods -n monitoring\nkubectl describe pod -n monitoring -l app=node-metrics"
},
{
"title": "2. Find the bad request",
"body": "A FailedScheduling / Insufficient memory event means the pod is asking for more memory than the node has. Inspect the deployment's resource requests to find the absurd value.",
"command": "kubectl get deploy node-metrics -n monitoring -o jsonpath='{.spec.template.spec.containers[0].resources.requests}'"
},
{
"title": "3. Right-size it",
"body": "Lower the memory request to something a small node can actually satisfy (for an nginx stand-in, 64Mi is plenty). kubectl set resources patches the live deployment and triggers a new rollout. Keep a request set — just make it sane.",
"command": "kubectl set resources deployment node-metrics -n monitoring --requests=memory=64Mi"
}
],
"setup_commands": [
{ "command": "kubectl create namespace monitoring" },
{ "command": "kubectl create deployment node-metrics --image=nginx:1.25 --replicas=1 -n monitoring" },
{ "command": "kubectl set resources deployment node-metrics -n monitoring --requests=memory=64Gi" }
],
"validation": {
"description": "Checks that node-metrics is right-sized: scheduled, 1/1 Ready, and still declaring a memory request.",
"commands": [
{
"description": "Deployment 'node-metrics' has 1 ready replica",
"command": "kubectl get deployment node-metrics -n monitoring -o jsonpath='{.status.readyReplicas}' 2>/dev/null | grep -v '^$' || echo 0",
"expected_output": "1",
"match": "exact"
},
{
"description": "No pods left in Pending state",
"command": "kubectl get pods -n monitoring --no-headers 2>/dev/null | awk '{print $3}' | grep -c 'Pending' || true",
"expected_output": "0",
"match": "exact"
},
{
"description": "Container still declares a memory request (governance not removed)",
"command": "kubectl get deployment node-metrics -n monitoring -o jsonpath='{.spec.template.spec.containers[0].resources.requests.memory}' 2>/dev/null | grep -c '.' || echo 0",
"expected_output": "1",
"match": "exact"
}
]
},
"default_namespace": "monitoring",
"teardown_commands": [
{ "command": "kubectl delete namespace monitoring --ignore-not-found --wait=false" }
]
}