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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>etcd Mastery Course</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); min-height: 100vh; }
.course-container { max-width: 1400px; margin: 0 auto; background: rgba(255, 255, 255, 0.95); border-radius: 20px; box-shadow: 0 20px 60px rgba(0,0,0,0.15); overflow: hidden; min-height: 100vh; display: flex; flex-direction: column; }
.header { background: linear-gradient(135deg, #2c3e50, #34495e); color: white; padding: 20px 40px; display: flex; justify-content: space-between; align-items: center; position: sticky; top: 0; z-index: 100; }
.header h1 { font-size: 2rem; }
.navigation { background: #34495e; padding: 0; display: flex; overflow-x: auto; }
.nav-tab { padding: 15px 25px; background: transparent; border: none; color: #bdc3c7; cursor: pointer; transition: all 0.3s; font-weight: 500; white-space: nowrap; position: relative; }
.nav-tab:hover { background: rgba(255,255,255,0.1); color: white; }
.nav-tab.active { color: white; background: rgba(52,152,219,0.3); }
.main-content { flex: 1; display: flex; flex-direction: column; }
.page { display: none; flex: 1; animation: fadeIn 0.5s; }
.page.active { display: flex; flex-direction: column; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
/* Practice Lab Styles */
.practice-content { display: grid; grid-template-columns: 1fr 1fr; height: 100%; }
.theory-panel { background: #f8f9fa; padding: 30px; border-right: 3px solid #e9ecef; overflow-y: auto; }
.practice-panel { padding: 30px; display: flex; flex-direction: column; }
.section { margin-bottom: 30px; }
.section h3 { color: #2c3e50; font-size: 1.3rem; margin-bottom: 15px; padding-bottom: 8px; border-bottom: 2px solid #3498db; }
.operation-card { background: white; border-radius: 10px; padding: 20px; margin-bottom: 15px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); border-left: 4px solid #3498db; }
.operation-card h4 { color: #2c3e50; margin-bottom: 10px; font-size: 1.1rem; }
.code { background: #2c3e50; color: #ecf0f1; padding: 12px 15px; border-radius: 6px; font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace; margin: 8px 0; font-size: 0.9rem; overflow-x: auto; }
.mode-toggle { display: flex; gap: 5px; margin-bottom: 20px; background: #ecf0f1; padding: 5px; border-radius: 25px; }
.mode-btn { flex: 1; padding: 10px 15px; border: none; border-radius: 20px; cursor: pointer; font-weight: bold; transition: all 0.3s; background: transparent; color: #7f8c8d; }
.mode-btn.active { background: #3498db; color: white; transform: translateY(-1px); box-shadow: 0 4px 8px rgba(52,152,219,0.3); }
.quick-commands { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.quick-btn { background: #95a5a6; color: white; border: none; padding: 8px 12px; border-radius: 20px; cursor: pointer; font-size: 0.8rem; transition: all 0.3s; }
.quick-btn:hover { background: #7f8c8d; transform: translateY(-1px); }
.command-input { display: flex; margin-bottom: 20px; }
.command-input input { flex-grow: 1; padding: 12px 15px; border: 2px solid #bdc3c7; border-radius: 8px 0 0 8px; font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace; font-size: 1rem; outline: none; }
.command-input input:focus { border-color: #3498db; }
.command-input button { padding: 12px 20px; background: #3498db; color: white; border: none; border-radius: 0 8px 8px 0; cursor: pointer; font-weight: bold; transition: all 0.3s; }
.command-input button:hover { background: #2980b9; transform: translateY(-1px); }
.output-area { background: #2c3e50; color: #2ecc71; font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace; padding: 20px; border-radius: 8px; overflow-y: auto; min-height: 300px; white-space: pre-wrap; line-height: 1.4; }
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.quiz-content p { margin-bottom: 15px; line-height: 1.6; }
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.quiz-actions button { padding: 8px 15px; border: none; border-radius: 6px; cursor: pointer; font-weight: bold; transition: all 0.3s; }
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.error { color: #e74c3c; }
.success { color: #2ecc71; }
.warning { color: #f39c12; }
/* Theory sidebar styles */
.theory-nav { list-style: none; }
.theory-nav li { margin-bottom: 8px; }
.theory-nav a { color: #7f8c8d; text-decoration: none; padding: 8px 12px; border-radius: 6px; display: block; transition: all 0.3s; font-size: 0.9rem; }
.theory-nav a:hover, .theory-nav a.active { background: #3498db; color: white; }
/* Diagram styles */
.diagram-container { background: white; border-radius: 15px; padding: 30px; margin: 30px 0; box-shadow: 0 10px 30px rgba(0,0,0,0.1); text-align: center; }
.diagram-title { color: #2c3e50; font-size: 1.3rem; margin-bottom: 20px; }
.diagram-svg { width: 100%; max-width: 600px; height: 300px; margin: 0 auto; }
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.diagram-btn:hover { background: #2980b9; transform: translateY(-1px); }
.diagram-btn.active { background: #2ecc71; }
</style>
</head>
<body>
<div class="course-container">
<div class="header">
<h1>🗄️ etcd Mastery Course</h1>
</div>
<nav class="navigation">
<button class="nav-tab active" onclick="showPage('overview')">📚 Course Overview</button>
<button class="nav-tab" onclick="showPage('theory')">🧠 Theory & Concepts</button>
<button class="nav-tab" onclick="showPage('architecture')">🏗️ Architecture</button>
<button class="nav-tab" onclick="showPage('usecases')">🎯 Real-world Use Cases</button>
<button class="nav-tab" onclick="showPage('practice')">🛠️ Practice Lab</button>
<button class="nav-tab" onclick="showPage('advanced')">⚡ Advanced Topics</button>
</nav>
<div class="main-content">
<div id="overview" class="page active">
<div style="padding: 40px;">
<h2>Course Overview</h2>
<p>Welcome to the etcd Mastery Course! Use the navigation above to explore modules.</p>
</div>
</div>
<div id="theory" class="page">
<div style="display: flex; height: 100%;">
<div style="width: 250px; background: #f8f9fa; border-right: 2px solid #e9ecef; padding: 20px;">
<h3>Course Topics</h3>
<ul class="theory-nav">
<li><a href="#" data-section="intro">What is etcd?</a></li>
<li><a href="#" data-section="keyvalue">Key-Value Store Basics</a></li>
<li><a href="#" data-section="consistency">Consistency & CAP Theorem</a></li>
<li><a href="#" data-section="raft">Raft Consensus Algorithm</a></li>
<li><a href="#" data-section="operations">Core Operations</a></li>
<li><a href="#" data-section="watch">Watch & Notifications</a></li>
<li><a href="#" data-section="ttl">TTL & Leases</a></li>
<li><a href="#" data-section="clustering">Clustering</a></li>
</ul>
</div>
<div style="flex: 1; padding: 40px;">
<div id="intro" class="theory-section active"></div>
<div id="keyvalue" class="theory-section" style="display:none;"></div>
<div id="consistency" class="theory-section" style="display:none;"></div>
<div id="raft" class="theory-section" style="display:none;"></div>
<div id="operations" class="theory-section" style="display:none;"></div>
<div id="watch" class="theory-section" style="display:none;"></div>
<div id="ttl" class="theory-section" style="display:none;"></div>
<div id="clustering" class="theory-section" style="display:none;"></div>
</div>
</div>
</div>
<div id="architecture" class="page">
<div style="padding: 40px;">
<h2>Architecture Deep Dive</h2>
<div class="diagram-container">
<h3 class="diagram-title">Interactive etcd Cluster Topology</h3>
<svg class="diagram-svg" id="clusterDiagram" viewBox="0 0 600 300"></svg>
<div class="diagram-controls">
<button class="diagram-btn" id="showNormal">Normal Operation</button>
<button class="diagram-btn" id="showFailure">Node Failure</button>
<button class="diagram-btn" id="showElection">Leader Election</button>
<button class="diagram-btn" id="showRecovery">Recovery</button>
</div>
</div>
<div class="diagram-container">
<h3 class="diagram-title">Data Flow Architecture</h3>
<svg class="diagram-svg" id="dataFlowDiagram" viewBox="0 0 600 400"></svg>
<div class="diagram-controls">
<button class="diagram-btn" onclick="animateDataFlow('write')">Write Operation</button>
<button class="diagram-btn" onclick="animateDataFlow('read')">Read Operation</button>
<button class="diagram-btn" onclick="animateDataFlow('watch')">Watch Notification</button>
</div>
</div>
</div>
</div>
<div id="usecases" class="page">
<div style="padding: 40px;">
<h2>Real-world Use Cases</h2>
<div class="output-area">Use case scenarios and code examples go here.</div>
</div>
</div>
<div id="practice" class="page">
<div class="practice-content">
<div class="theory-panel">
<div class="section">
<h3>🔑 Basic Operations</h3>
<div class="operation-card">
<h4>PUT - Store Key-Value Pairs</h4>
<p>Store data in etcd with a key-value pair.</p>
<div class="code">etcd put /config/app/name "MyApp"</div>
<div class="code">etcd put /users/1 "John Doe"</div>
</div>
<div class="operation-card">
<h4>GET - Retrieve Data</h4>
<p>Get values by key or with prefix matching.</p>
<div class="code">etcd get /config/app/name</div>
<div class="code">etcd get /config/ --prefix</div>
</div>
<div class="operation-card">
<h4>DEL - Delete Keys</h4>
<p>Remove keys from the store.</p>
<div class="code">etcd del /config/app/name</div>
<div class="code">etcd del /config/ --prefix</div>
</div>
</div>
<div class="section">
<h3>🔔 Advanced Features</h3>
<div class="operation-card">
<h4>WATCH - Real-time Notifications</h4>
<p>Subscribe to changes in etcd.</p>
<div class="code">etcd watch /config/app/name</div>
<div class="code">etcd watch /config/ --prefix</div>
</div>
<div class="operation-card">
<h4>TTL - Time To Live</h4>
<p>Set expiration time for keys.</p>
<div class="code">etcd put /session/abc123 "active" --ttl=60</div>
</div>
</div>
</div>
<div class="practice-panel">
<div class="mode-toggle">
<button id="practiceBtn" class="mode-btn active" onclick="setMode('practice')">🛠️ Free Practice</button>
<button id="quizBtn" class="mode-btn" onclick="setMode('quiz')">❓ Guided Questions</button>
</div>
<div class="quick-commands">
<button class="quick-btn" onclick="insertCommand('etcd put /config/app/name MyApp')">Sample PUT</button>
<button class="quick-btn" onclick="insertCommand('etcd get /config/app/name')">Sample GET</button>
<button class="quick-btn" onclick="insertCommand('etcd get /config/ --prefix')">GET Prefix</button>
<button class="quick-btn" onclick="insertCommand('etcd del /config/app/name')">Sample DEL</button>
<button class="quick-btn" onclick="insertCommand('etcd watch /config/app/name')">Sample WATCH</button>
<button class="quick-btn" onclick="clearOutput()">Clear Output</button>
</div>
<div class="command-input">
<input type="text" id="commandInput" placeholder="Enter etcd command (e.g., etcd put /key value)" onkeypress="handleKeyPress(event)">
<button onclick="executeCommand()">Execute</button>
</div>
<div class="output-area" id="output">Welcome to etcd Practice Lab! 🚀
Try these commands to get started:
• etcd put /config/app/name "MyApp"
• etcd get /config/app/name
• etcd get /config/ --prefix
• etcd del /config/app/name
Current etcd store is empty. Start adding some data!
</div>
<div id="quizSection" style="display:none;margin-top:20px;">
<div class="quiz-section">
<div class="quiz-header">
<h4 id="currentQuestion">Loading...</h4>
<div class="quiz-progress">Question <span id="questionNum">1</span> of <span id="totalQuestions">3</span></div>
</div>
<div class="quiz-content">
<p id="questionText">Loading...</p>
<div id="questionHint" class="hint" style="display: none;"></div>
<div class="quiz-actions">
<button onclick="showHint()" class="hint-btn">💡 Hint</button>
<button onclick="checkAnswer()" class="check-btn">✅ Check My Solution</button>
<button onclick="nextQuestion()" class="next-btn" id="nextBtn" style="display: none;">Next Question ➡️</button>
<button onclick="skipQuestion()" class="skip-btn">⏭️ Skip Question</button>
<button onclick="resetQuiz()" class="reset-btn">🔄 Restart Quiz</button>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="status-bar">
<span>etcd v3.5.x Simulator | Keys in store: <span id="keyCount">0</span> | Status: <span id="status">Ready</span></span>
</div>
</div>
<div id="advanced" class="page">
<div style="padding: 40px;">
<h2>Advanced Topics</h2>
<div class="output-area">Security, performance, and operational best practices go here.</div>
</div>
</div>
</div>
</div>
<script>
// Simulated etcd store and variables
let etcdStore = new Map();
let watchers = new Map();
let leases = new Map();
let leaseCounter = 1000;
let currentMode = 'practice';
let currentQuestionIndex = 0;
let userSolutions = [];
const questions = [
{
level: "Beginner",
title: "Store and Retrieve Personal Data",
text: "Store your name with the key '/user/name' and then retrieve it to verify it was stored correctly.",
hint: "Use 'etcd put /user/name \"YourName\"' to store, then 'etcd get /user/name' to retrieve.",
expectedCommands: ["put", "get"],
expectedKeys: ["/user/name"],
validation: (commands, store) => {
return commands.some(cmd => cmd.includes("put") && cmd.includes("/user/name")) &&
commands.some(cmd => cmd.includes("get") && cmd.includes("/user/name")) &&
store.has("/user/name");
}
},
{
level: "Intermediate",
title: "Configuration Management",
text: "Create a configuration structure with multiple keys under '/config/app/' and retrieve all config keys at once.",
hint: "Use 'etcd put /config/app/name \"MyApp\"' and similar commands, then 'etcd get /config/ --prefix' to get all.",
expectedCommands: ["put", "get"],
expectedKeys: ["/config/app/"],
validation: (commands, store) => {
const hasConfigPuts = commands.some(cmd => cmd.includes("put") && cmd.includes("/config/app/"));
const hasPrefixGet = commands.some(cmd => cmd.includes("get") && cmd.includes("--prefix"));
return hasConfigPuts && hasPrefixGet;
}
},
{
level: "Advanced",
title: "Dynamic Service Discovery",
text: "Create a service registry where services register themselves with health info: '/registry/service-a/health', '/registry/service-b/health'. Set TTL for auto-cleanup and use watch to monitor service health.",
hint: "Combine service registration with TTL for health checks and use watch to monitor the '/registry/' prefix for changes.",
expectedCommands: ["put", "watch"],
expectedKeys: ["/registry/service-a/health", "/registry/service-b/health"],
validation: (commands, store) => {
const hasRegistration = commands.some(cmd => cmd.includes("put") && cmd.includes("/registry/"));
const hasWatch = commands.some(cmd => cmd.includes("watch") && cmd.includes("/registry/"));
return hasRegistration && hasWatch;
}
}
];
// Navigation functions
function showPage(pageId) {
document.querySelectorAll('.page').forEach(page => {
page.classList.remove('active');
});
const pageEl = document.getElementById(pageId);
if (pageEl) pageEl.classList.add('active');
document.querySelectorAll('.nav-tab').forEach(tab => {
tab.classList.remove('active');
});
const tabMap = {
'overview': 0,
'theory': 1,
'architecture': 2,
'usecases': 3,
'practice': 4,
'advanced': 5
};
const tabIndex = tabMap[pageId];
if (typeof tabIndex !== 'undefined') {
document.querySelectorAll('.nav-tab')[tabIndex].classList.add('active');
}
}
// 1. Move all main functions to the top level and attach to window
function showTheorySection(sectionId, event) {
// Hide all sections
document.querySelectorAll('.theory-section').forEach(section => {
section.style.display = 'none';
section.classList.remove('active');
});
// Show the selected section
const sectionEl = document.getElementById(sectionId);
if (sectionEl) {
sectionEl.style.display = '';
sectionEl.classList.add('active');
}
// Remove 'active' from all sidebar links
document.querySelectorAll('.theory-nav a').forEach(link => {
link.classList.remove('active');
});
// Add 'active' to the clicked link
if (event && event.target) {
event.target.classList.add('active');
}
}
window.showTheorySection = showTheorySection;
function executeTheoryCommand(inputId, outputId) {
const input = document.getElementById(inputId);
const output = document.getElementById(outputId);
if (!input || !output) return;
const command = input.value.trim();
if (!command) return;
output.innerHTML += `<div style="color: #f39c12;">$ ${command}</div>`;
try {
const { command: cmd, args, flags } = parseCommand(command);
let result = '';
switch (cmd.toLowerCase()) {
case 'put':
if (args.length < 2) throw new Error('PUT requires key and value');
const key = args[0];
const value = args.slice(1).join(' ').replace(/^"|"$/g, '');
etcdStore.set(key, value);
result = `OK`;
break;
case 'get':
if (args.length < 1) throw new Error('GET requires a key');
const getKey = args[0];
if (flags.prefix) {
let found = false;
for (let k of etcdStore.keys()) {
if (k.startsWith(getKey)) {
result += `${k}\n${etcdStore.get(k)}\n`;
found = true;
}
}
if (!found) result = 'No keys found with prefix.';
} else {
if (etcdStore.has(getKey)) {
result = etcdStore.get(getKey);
} else {
result = 'Key not found.';
}
}
break;
case 'del':
case 'delete':
if (args.length < 1) throw new Error('DEL requires a key');
const delKey = args[0];
if (flags.prefix) {
let count = 0;
for (let k of Array.from(etcdStore.keys())) {
if (k.startsWith(delKey)) {
etcdStore.delete(k);
count++;
}
}
result = `${count}`;
} else {
if (etcdStore.delete(delKey)) {
result = `1`;
} else {
result = `0`;
}
}
break;
case 'watch':
if (args.length < 1) throw new Error('WATCH requires a key');
const watchKey = args[0];
const watchId = Math.random().toString(36).substr(2, 9);
if (!watchers.has(watchKey)) watchers.set(watchKey, []);
watchers.get(watchKey).push({ id: watchId, prefix: flags.prefix || false });
result = `Started watching: ${watchKey}\nWatch ID: ${watchId}`;
break;
default:
throw new Error(`Unknown command: ${cmd}`);
}
output.innerHTML += `<div style=\"color: #2ecc71;\">${result}</div>`;
} catch (error) {
output.innerHTML += `<div style=\"color: #e74c3c;\">Error: ${error.message}</div>`;
}
input.value = '';
output.scrollTop = output.scrollHeight;
}
window.executeTheoryCommand = executeTheoryCommand;
function renderTheoryContent() {
// What is etcd?
document.getElementById('intro').innerHTML = `
<h2>What is etcd?</h2>
<p><b>etcd</b> is a distributed, reliable key-value store for critical data in distributed systems. It is used for service discovery, configuration, and coordination of distributed systems like Kubernetes.</p>
<div style='margin:20px 0;'>
<svg width='320' height='80'>
<rect x='10' y='10' width='90' height='60' fill='#3498db' rx='10'/>
<rect x='115' y='10' width='90' height='60' fill='#2ecc71' rx='10'/>
<rect x='220' y='10' width='90' height='60' fill='#f39c12' rx='10'/>
<text x='55' y='45' fill='white' font-size='16' text-anchor='middle'>Node 1</text>
<text x='160' y='45' fill='white' font-size='16' text-anchor='middle'>Node 2</text>
<text x='265' y='45' fill='white' font-size='16' text-anchor='middle'>Node 3</text>
</svg>
<div style='font-size:0.95em;margin-top:8px;'>
<b>Diagram:</b> etcd cluster with 3 nodes (all keep data in sync)
</div>
</div>
<div class='code'>
# Example: Service Discovery
etcd put /services/api/node1 "10.0.0.1:8080"
etcd get /services/api/ --prefix
</div>
<h3>🎯 Practice Exercise: Service Discovery</h3>
<div style='background:#f8f9fa;padding:15px;border-radius:8px;margin:15px 0;'>
<p><b>Objective:</b> Learn how etcd is used for service discovery.</p>
<p><b>Steps:</b></p>
<ol>
<li>Register a web service: <code>etcd put /services/web/node1 "192.168.1.10:8080"</code></li>
<li>Register another service: <code>etcd put /services/web/node2 "192.168.1.11:8080"</code></li>
<li>Register a database service: <code>etcd put /services/db/primary "192.168.1.20:5432"</code></li>
<li>Discover all web services: <code>etcd get /services/web/ --prefix</code></li>
<li>Discover all services: <code>etcd get /services/ --prefix</code></li>
</ol>
<div style='margin-top:10px;'>
<div style='display:flex;align-items:center;background:#2c3e50;border-radius:5px;padding:5px;'>
<span style='color:#f39c12;font-family:monospace;margin-right:10px;'>$</span>
<input type='text' id='intro-cmd' placeholder='etcd put /key value' style='flex:1;background:transparent;border:none;color:#2ecc71;font-family:monospace;outline:none;'>
<button onclick='executeTheoryCommand("intro-cmd", "intro-output")' style='margin-left:8px;padding:6px 16px;background:#3498db;color:white;border:none;border-radius:4px;cursor:pointer;'>Run</button>
</div>
</div>
<div id='intro-output' style='background:#2c3e50;color:#2ecc71;padding:10px;border-radius:5px;margin-top:10px;font-family:monospace;min-height:60px;max-height:200px;overflow-y:auto;'></div>
</div>
`;
// Key-Value Store Basics
document.getElementById('keyvalue').innerHTML = `<h2>Key-Value Store Basics</h2><p>etcd stores data as <b>key-value pairs</b>. Keys are like file paths, and values are strings. You can organize data hierarchically using slashes.</p><div class='code'>/config/app/name → "MyApp"<br>/config/app/port → "8080"<br>/services/api/node1 → "10.0.0.1:8080"</div><div style='margin:20px 0;'><svg width='320' height='80'><rect x='10' y='30' width='300' height='30' fill='#ecf0f1' rx='8'/><text x='160' y='50' fill='#2c3e50' font-size='16' text-anchor='middle'>/config/app/name → "MyApp"</text></svg><div style='font-size:0.95em;margin-top:8px;'><b>Diagram:</b> Key-value mapping in etcd</div></div><div class='code'># List all config keys<br>etcd get /config/ --prefix</div><h3>🎯 Practice Exercise: Hierarchical Keys</h3><div style='background:#f8f9fa;padding:15px;border-radius:8px;margin:15px 0;'><p><b>Objective:</b> Understand hierarchical key organization.</p><p><b>Steps:</b></p><ol><li>Create app config: <code>etcd put /config/app/name "MyApp"</code></li><li>Add app port: <code>etcd put /config/app/port "8080"</code></li><li>Add database config: <code>etcd put /config/db/host "localhost"</code></li><li>Add database port: <code>etcd put /config/db/port "5432"</code></li><li>List all app config: <code>etcd get /config/app/ --prefix</code></li><li>List all database config: <code>etcd get /config/db/ --prefix</code></li><li>List all config: <code>etcd get /config/ --prefix</code></li></ol><div style='margin-top:10px;'><div style='display:flex;align-items:center;background:#2c3e50;border-radius:5px;padding:5px;'><span style='color:#f39c12;font-family:monospace;margin-right:10px;'>$</span><input type='text' id='keyvalue-cmd' placeholder='etcd put /key value' style='flex:1;background:transparent;border:none;color:#2ecc71;font-family:monospace;outline:none;'><button onclick='executeTheoryCommand("keyvalue-cmd", "keyvalue-output")' style='margin-left:8px;padding:6px 16px;background:#3498db;color:white;border:none;border-radius:4px;cursor:pointer;'>Run</button></div></div><div id='keyvalue-output' style='background:#2c3e50;color:#2ecc71;padding:10px;border-radius:5px;margin-top:10px;font-family:monospace;min-height:60px;max-height:200px;overflow-y:auto;'></div></div>`;
// Consistency & CAP Theorem
document.getElementById('consistency').innerHTML = `<h2>Consistency & CAP Theorem</h2><p>The <b>CAP theorem</b> says a distributed system can only guarantee two of three: <b>Consistency</b>, <b>Availability</b>, <b>Partition Tolerance</b>.</p><div style='margin:20px 0;'><svg width='200' height='180'><polygon points='100,20 180,150 20,150' fill='#f1c40f' stroke='#34495e' stroke-width='3'/><text x='100' y='40' text-anchor='middle' font-size='16' fill='#34495e'>Consistency</text><text x='40' y='140' text-anchor='middle' font-size='16' fill='#34495e'>Partition</text><text x='160' y='140' text-anchor='middle' font-size='16' fill='#34495e'>Availability</text></svg><div style='font-size:0.95em;margin-top:8px;'><b>Diagram:</b> CAP Theorem Triangle (etcd chooses Consistency + Partition Tolerance)</div></div><div class='code'># etcd is CP (Consistency + Partition Tolerance)<br>etcd put /config/version "1.2.3"<br>etcd get /config/version</div><div style='margin-top:10px;font-size:0.95em;'><b>Analogy:</b> Like a group chat: if the network splits, you can either stop sending messages (Consistency) or allow messages that might not reach everyone (Availability).</div><h3>🎯 Practice Exercise: Understanding Consistency</h3><div style='background:#f8f9fa;padding:15px;border-radius:8px;margin:15px 0;'><p><b>Objective:</b> See how etcd ensures consistency across operations.</p><p><b>Steps:</b></p><ol><li>Set a critical config: <code>etcd put /config/critical/flag "enabled"</code></li><li>Verify it's set: <code>etcd get /config/critical/flag</code></li><li>Update the config: <code>etcd put /config/critical/flag "disabled"</code></li><li>Verify the update: <code>etcd get /config/critical/flag</code></li><li>Notice: The value is immediately consistent across all reads</li></ol><div style='margin-top:10px;'><div style='display:flex;align-items:center;background:#2c3e50;border-radius:5px;padding:5px;'><span style='color:#f39c12;font-family:monospace;margin-right:10px;'>$</span><input type='text' id='consistency-cmd' placeholder='etcd put /key value' style='flex:1;background:transparent;border:none;color:#2ecc71;font-family:monospace;outline:none;'><button onclick='executeTheoryCommand("consistency-cmd", "consistency-output")' style='margin-left:8px;padding:6px 16px;background:#3498db;color:white;border:none;border-radius:4px;cursor:pointer;'>Run</button></div></div><div id='consistency-output' style='background:#2c3e50;color:#2ecc71;padding:10px;border-radius:5px;margin-top:10px;font-family:monospace;min-height:60px;max-height:200px;overflow-y:auto;'></div></div>`;
// Raft Consensus Algorithm
document.getElementById('raft').innerHTML = `<h2>Raft Consensus Algorithm</h2><p>etcd uses <b>Raft</b> to keep all nodes in sync. Raft elects a leader, and all writes go through the leader. If the leader fails, a new one is elected.</p><div style='margin:20px 0;'><svg width='320' height='100'><circle cx='60' cy='50' r='30' fill='#2ecc71'/><text x='60' y='55' fill='white' font-size='16' text-anchor='middle'>Leader</text><circle cx='180' cy='50' r='30' fill='#3498db'/><text x='180' y='55' fill='white' font-size='16' text-anchor='middle'>Follower</text><circle cx='300' cy='50' r='30' fill='#3498db'/><text x='300' y='55' fill='white' font-size='16' text-anchor='middle'>Follower</text><polyline points='90,50 150,50' stroke='#34495e' stroke-width='3' marker-end='url(#arrowhead)'/><polyline points='210,50 270,50' stroke='#34495e' stroke-width='3' marker-end='url(#arrowhead)'/><defs><marker id='arrowhead' markerWidth='10' markerHeight='7' refX='10' refY='3.5' orient='auto'><polygon points='0 0, 10 3.5, 0 7' fill='#34495e'/></marker></defs></svg><div style='font-size:0.95em;margin-top:8px;'><b>Diagram:</b> Raft: Leader replicates to followers</div></div><div class='code'># All writes go to the leader<br>etcd put /config/app/name "MyApp"</div><h3>🎯 Practice Exercise: Leader-Based Writes</h3><div style='background:#f8f9fa;padding:15px;border-radius:8px;margin:15px 0;'><p><b>Objective:</b> Understand how all writes go through the leader.</p><p><b>Steps:</b></p><ol><li>Write through leader: <code>etcd put /raft/demo "leader-write"</code></li><li>Read from any node: <code>etcd get /raft/demo</code></li><li>Write another value: <code>etcd put /raft/demo "consensus-achieved"</code></li><li>Verify consistency: <code>etcd get /raft/demo</code></li><li>Notice: All writes succeed only if leader replicates to majority</li></ol><div style='margin-top:10px;'><div style='display:flex;align-items:center;background:#2c3e50;border-radius:5px;padding:5px;'><span style='color:#f39c12;font-family:monospace;margin-right:10px;'>$</span><input type='text' id='raft-cmd' placeholder='etcd put /key value' style='flex:1;background:transparent;border:none;color:#2ecc71;font-family:monospace;outline:none;'><button onclick='executeTheoryCommand("raft-cmd", "raft-output")' style='margin-left:8px;padding:6px 16px;background:#3498db;color:white;border:none;border-radius:4px;cursor:pointer;'>Run</button></div></div><div id='raft-output' style='background:#2c3e50;color:#2ecc71;padding:10px;border-radius:5px;margin-top:10px;font-family:monospace;min-height:60px;max-height:200px;overflow-y:auto;'></div></div>`;
// Core Operations
document.getElementById('operations').innerHTML = `<h2>Core Operations</h2><p>etcd supports <b>PUT</b> (store), <b>GET</b> (retrieve), <b>DEL</b> (delete), and <b>WATCH</b> (subscribe to changes).</p><div class='code'># Store a value<br>etcd put /config/app/name "MyApp"<br># Retrieve a value<br>etcd get /config/app/name<br># Delete a value<br>etcd del /config/app/name<br># Watch for changes<br>etcd watch /config/app/name</div><h3>🎯 Practice Exercise: CRUD Operations</h3><div style='background:#f8f9fa;padding:15px;border-radius:8px;margin:15px 0;'><p><b>Objective:</b> Master the four core operations.</p><p><b>Steps:</b></p><ol><li><b>CREATE:</b> <code>etcd put /exercise/user "John Doe"</code></li><li><b>READ:</b> <code>etcd get /exercise/user</code></li><li><b>UPDATE:</b> <code>etcd put /exercise/user "Jane Smith"</code></li><li><b>READ again:</b> <code>etcd get /exercise/user</code></li><li><b>DELETE:</b> <code>etcd del /exercise/user</code></li><li><b>Verify deletion:</b> <code>etcd get /exercise/user</code></li></ol><div style='margin-top:10px;'><div style='display:flex;align-items:center;background:#2c3e50;border-radius:5px;padding:5px;'><span style='color:#f39c12;font-family:monospace;margin-right:10px;'>$</span><input type='text' id='operations-cmd' placeholder='etcd put /key value' style='flex:1;background:transparent;border:none;color:#2ecc71;font-family:monospace;outline:none;'><button onclick='executeTheoryCommand("operations-cmd", "operations-output")' style='margin-left:8px;padding:6px 16px;background:#3498db;color:white;border:none;border-radius:4px;cursor:pointer;'>Run</button></div></div><div id='operations-output' style='background:#2c3e50;color:#2ecc71;padding:10px;border-radius:5px;margin-top:10px;font-family:monospace;min-height:60px;max-height:200px;overflow-y:auto;'></div></div>`;
// Watch & Notifications
document.getElementById('watch').innerHTML = `<h2>Watch & Real-time Notifications</h2><p>Applications can <b>watch</b> keys or prefixes and get notified instantly when data changes.</p><div style='margin:20px 0;'><svg width='320' height='80'><rect x='10' y='30' width='90' height='30' fill='#2ecc71' rx='8'/><rect x='120' y='30' width='90' height='30' fill='#3498db' rx='8'/><rect x='230' y='30' width='80' height='30' fill='#f39c12' rx='8'/><text x='55' y='50' fill='white' font-size='16' text-anchor='middle'>App</text><text x='165' y='50' fill='white' font-size='16' text-anchor='middle'>etcd</text><text x='270' y='50' fill='white' font-size='16' text-anchor='middle'>Notify</text></svg><div style='font-size:0.95em;margin-top:8px;'><b>Diagram:</b> App watches etcd, gets notified on changes</div></div><div class='code'># Watch a key<br>etcd watch /config/app/name<br># Watch a prefix<br>etcd watch /config/ --prefix</div><h3>🎯 Practice Exercise: Real-time Monitoring</h3><div style='background:#f8f9fa;padding:15px;border-radius:8px;margin:15px 0;'><p><b>Objective:</b> Understand real-time change notifications.</p><p><b>Steps:</b></p><ol><li>Start watching: <code>etcd watch /watch/demo --prefix</code></li><li>In another terminal, make changes:</li><li>Add a key: <code>etcd put /watch/demo/key1 "value1"</code></li><li>Update the key: <code>etcd put /watch/demo/key1 "updated"</code></li><li>Delete the key: <code>etcd del /watch/demo/key1</code></li><li>Notice: Each change triggers a notification</li></ol><div style='margin-top:10px;'><div style='display:flex;align-items:center;background:#2c3e50;border-radius:5px;padding:5px;'><span style='color:#f39c12;font-family:monospace;margin-right:10px;'>$</span><input type='text' id='watch-cmd' placeholder='etcd put /key value' style='flex:1;background:transparent;border:none;color:#2ecc71;font-family:monospace;outline:none;'><button onclick='executeTheoryCommand("watch-cmd", "watch-output")' style='margin-left:8px;padding:6px 16px;background:#3498db;color:white;border:none;border-radius:4px;cursor:pointer;'>Run</button></div></div><div id='watch-output' style='background:#2c3e50;color:#2ecc71;padding:10px;border-radius:5px;margin-top:10px;font-family:monospace;min-height:60px;max-height:200px;overflow-y:auto;'></div></div>`;
// TTL & Leases
document.getElementById('ttl').innerHTML = `<h2>TTL & Leases</h2><p>Keys can have a <b>TTL</b> (Time To Live) and be attached to a <b>lease</b>. When the lease expires, the key is deleted automatically.</p><div class='code'># Create a 60-second lease<br>etcd lease grant 60<br># Attach a key to the lease<br>etcd put /session/abc123 "active" --lease=LEASE_ID</div><div style='margin:20px 0;'><svg width='320' height='80'><rect x='10' y='30' width='140' height='30' fill='#2ecc71' rx='8'/><rect x='170' y='30' width='140' height='30' fill='#e74c3c' rx='8'/><text x='80' y='50' fill='white' font-size='16' text-anchor='middle'>Key with TTL</text><text x='240' y='50' fill='white' font-size='16' text-anchor='middle'>Expires!</text></svg><div style='font-size:0.95em;margin-top:8px;'><b>Diagram:</b> Key expires after TTL</div></div><h3>🎯 Practice Exercise: Automatic Cleanup</h3><div style='background:#f8f9fa;padding:15px;border-radius:8px;margin:15px 0;'><p><b>Objective:</b> Learn about automatic key expiration.</p><p><b>Steps:</b></p><ol><li>Create a session key: <code>etcd put /session/user123 "logged-in" --ttl=30</code></li><li>Verify it exists: <code>etcd get /session/user123</code></li><li>Wait 30 seconds...</li><li>Check if expired: <code>etcd get /session/user123</code></li><li>Create a temporary cache: <code>etcd put /cache/data "temp-data" --ttl=60</code></li><li>List all session keys: <code>etcd get /session/ --prefix</code></li></ol><div style='margin-top:10px;'><div style='display:flex;align-items:center;background:#2c3e50;border-radius:5px;padding:5px;'><span style='color:#f39c12;font-family:monospace;margin-right:10px;'>$</span><input type='text' id='ttl-cmd' placeholder='etcd put /key value' style='flex:1;background:transparent;border:none;color:#2ecc71;font-family:monospace;outline:none;'><button onclick='executeTheoryCommand("ttl-cmd", "ttl-output")' style='margin-left:8px;padding:6px 16px;background:#3498db;color:white;border:none;border-radius:4px;cursor:pointer;'>Run</button></div></div><div id='ttl-output' style='background:#2c3e50;color:#2ecc71;padding:10px;border-radius:5px;margin-top:10px;font-family:monospace;min-height:60px;max-height:200px;overflow-y:auto;'></div></div>`;
// Clustering
document.getElementById('clustering').innerHTML = `<h2>etcd Clustering</h2><p>etcd runs as a <b>cluster</b> for high availability. A typical cluster has 3, 5, or 7 nodes. Data is safe as long as a majority of nodes are up.</p><div style='margin:20px 0;'><svg width='320' height='80'><circle cx='60' cy='50' r='30' fill='#2ecc71'/><circle cx='160' cy='50' r='30' fill='#2ecc71'/><circle cx='260' cy='50' r='30' fill='#2ecc71'/><text x='60' y='55' fill='white' font-size='16' text-anchor='middle'>Node 1</text><text x='160' y='55' fill='white' font-size='16' text-anchor='middle'>Node 2</text><text x='260' y='55' fill='white' font-size='16' text-anchor='middle'>Node 3</text></svg><div style='font-size:0.95em;margin-top:8px;'><b>Diagram:</b> 3-node etcd cluster (majority needed for safety)</div></div><div class='code'># Start a 3-node cluster<br>etcd --name node1 ... --initial-cluster node1=...,node2=...,node3=...</div><h3>🎯 Practice Exercise: High Availability</h3><div style='background:#f8f9fa;padding:15px;border-radius:8px;margin:15px 0;'><p><b>Objective:</b> Understand cluster behavior and quorum.</p><p><b>Steps:</b></p><ol><li>Store critical data: <code>etcd put /cluster/critical "must-survive"</code></li><li>Verify data exists: <code>etcd get /cluster/critical</code></li><li>Simulate node failure (in real cluster, one node would be down)</li><li>Data should still be accessible: <code>etcd get /cluster/critical</code></li><li>Add more critical data: <code>etcd put /cluster/backup "replicated"</code></li><li>List all cluster data: <code>etcd get /cluster/ --prefix</code></li></ol><div style='margin-top:10px;'><div style='display:flex;align-items:center;background:#2c3e50;border-radius:5px;padding:5px;'><span style='color:#f39c12;font-family:monospace;margin-right:10px;'>$</span><input type='text' id='clustering-cmd' placeholder='etcd put /key value' style='flex:1;background:transparent;border:none;color:#2ecc71;font-family:monospace;outline:none;'><button onclick='executeTheoryCommand("clustering-cmd", "clustering-output")' style='margin-left:8px;padding:6px 16px;background:#3498db;color:white;border:none;border-radius:4px;cursor:pointer;'>Run</button></div></div><div id='clustering-output' style='background:#2c3e50;color:#2ecc71;padding:10px;border-radius:5px;margin-top:10px;font-family:monospace;min-height:60px;max-height:200px;overflow-y:auto;'></div></div>`;
// Explicit mapping from sidebar link text to section ID
const sectionMap = {
"What is etcd?": "intro",
"Key-Value Store Basics": "keyvalue",
"Consistency & CAP Theorem": "consistency",
"Raft Consensus Algorithm": "raft",
"Core Operations": "operations",
"Watch & Notifications": "watch",
"TTL & Leases": "ttl",
"Clustering": "clustering"
};
document.querySelectorAll('.theory-nav a').forEach(link => {
link.onclick = function(event) {
event.preventDefault();
const sectionId = this.getAttribute('data-section');
if (sectionId) showTheorySection(sectionId, event);
};
});
// CLI Enter key and Run button
[
'intro-cmd',
'keyvalue-cmd',
'consistency-cmd',
'raft-cmd',
'operations-cmd',
'watch-cmd',
'ttl-cmd',
'clustering-cmd'
].forEach(function(id) {
const input = document.getElementById(id);
const outputId = id.replace('-cmd', '-output');
if (input) {
input.onkeydown = function(e) {
if (e.key === 'Enter') {
executeTheoryCommand(id, outputId);
}
};
}
});
}
document.addEventListener('DOMContentLoaded', function() {
renderTheoryContent();
});
// 2. Inside DOMContentLoaded, only set up event listeners and call renderTheoryContent():
document.addEventListener('DOMContentLoaded', function() {
// ... all your setup code ...
renderTheoryContent();
});
// 3. In showTheorySection, call renderTheoryContent() after switching section:
function showTheorySection(sectionId, event) {
// ... existing code ...
renderTheoryContent();
}
// Diagram functions
function showClusterState(state) {
const svg = document.getElementById('clusterDiagram');
if (!svg) return;
svg.innerHTML = '';
if (state === 'normal') {
svg.innerHTML = '<circle cx="100" cy="150" r="40" fill="#2ecc71" /><text x="100" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 1</text>' +
'<circle cx="300" cy="150" r="40" fill="#2ecc71" /><text x="300" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 2</text>' +
'<circle cx="500" cy="150" r="40" fill="#2ecc71" /><text x="500" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 3</text>';
} else if (state === 'failure') {
svg.innerHTML = '<circle cx="100" cy="150" r="40" fill="#e74c3c" /><text x="100" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 1</text>' +
'<circle cx="300" cy="150" r="40" fill="#2ecc71" /><text x="300" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 2</text>' +
'<circle cx="500" cy="150" r="40" fill="#2ecc71" /><text x="500" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 3</text>';
} else if (state === 'election') {
svg.innerHTML = '<circle cx="100" cy="150" r="40" fill="#f39c12" /><text x="100" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 1</text>' +
'<circle cx="300" cy="150" r="40" fill="#f39c12" /><text x="300" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 2</text>' +
'<circle cx="500" cy="150" r="40" fill="#2ecc71" /><text x="500" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 3</text>';
} else if (state === 'recovery') {
svg.innerHTML = '<circle cx="100" cy="150" r="40" fill="#2ecc71" /><text x="100" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 1</text>' +
'<circle cx="300" cy="150" r="40" fill="#2ecc71" /><text x="300" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 2</text>' +
'<circle cx="500" cy="150" r="40" fill="#2ecc71" /><text x="500" y="155" text-anchor="middle" fill="#fff" font-size="18">Node 3</text>';
}
}
function animateDataFlow(type) {
const svg = document.getElementById('dataFlowDiagram');
if (!svg) return;
svg.innerHTML = '';
if (type === 'write') {
svg.innerHTML = '<rect x="50" y="180" width="500" height="40" fill="#3498db" />' +
'<text x="300" y="205" text-anchor="middle" fill="#fff" font-size="20">Write Path: Client → Leader → Followers</text>';
} else if (type === 'read') {
svg.innerHTML = '<rect x="50" y="80" width="500" height="40" fill="#2ecc71" />' +
'<text x="300" y="105" text-anchor="middle" fill="#fff" font-size="20">Read Path: Client → Any Node</text>';
} else if (type === 'watch') {
svg.innerHTML = '<rect x="50" y="280" width="500" height="40" fill="#f39c12" />' +
'<text x="300" y="305" text-anchor="middle" fill="#fff" font-size="20">Watch: Server → Client (Push)</text>';
}
}
// Practice Lab functions
function addOutput(msg, cls) {
const output = document.getElementById('output');
if (!output) return;
const span = document.createElement('span');
if (cls) span.className = cls;
span.textContent = msg + '\n';
output.appendChild(span);
output.scrollTop = output.scrollHeight;
}
function clearOutput() {
const output = document.getElementById('output');
if (output) output.innerHTML = '';
}
function updateStatus(msg, cls) {
const statusEl = document.getElementById('status');
if (statusEl) {
statusEl.textContent = msg;
statusEl.className = cls || '';
}
}
function updateKeyCount() {
const keyCountEl = document.getElementById('keyCount');
if (keyCountEl) {
keyCountEl.textContent = etcdStore.size;
}
}
function parseCommand(input) {
const parts = input.trim().split(/\s+/);
let command = parts[0];
const args = [];
const flags = {};
// Handle both "etcd put" and "put" formats
if (command.toLowerCase() === 'etcd') {
if (parts.length < 2) throw new Error('Command requires an operation (put, get, del, watch)');
command = parts[1];
for (let i = 2; i < parts.length; i++) {
if (parts[i].startsWith('--')) {
const [flag, val] = parts[i].substring(2).split('=');
flags[flag] = val === undefined ? true : val;
} else {
args.push(parts[i]);
}
}
} else {
// Handle direct command format (put, get, del, watch)
for (let i = 1; i < parts.length; i++) {
if (parts[i].startsWith('--')) {
const [flag, val] = parts[i].substring(2).split('=');
flags[flag] = val === undefined ? true : val;
} else {
args.push(parts[i]);
}
}
}
return { command, args, flags };
}
function executePut(args, flags) {
if (args.length < 2) throw new Error('PUT requires key and value');
const key = args[0];
const value = args.slice(1).join(' ').replace(/^"|"$/g, '');
etcdStore.set(key, value);
addOutput(`OK: Set ${key} = ${value}`, 'success');
triggerWatchers(key, 'PUT', value);
updateKeyCount();
updateStatus('PUT success', 'success');
}
function executeGet(args, flags) {
if (args.length < 1) throw new Error('GET requires a key');
const key = args[0];
if (flags.prefix) {
let found = false;
for (let k of etcdStore.keys()) {
if (k.startsWith(key)) {
addOutput(`${k}: ${etcdStore.get(k)}`);
found = true;
}
}
if (!found) addOutput('No keys found with prefix.');
} else {
if (etcdStore.has(key)) {
addOutput(etcdStore.get(key));
} else {
addOutput('Key not found.');
}
}
updateStatus('GET complete', 'success');
}
function executeDel(args, flags) {
if (args.length < 1) throw new Error('DEL requires a key');
const key = args[0];
if (flags.prefix) {
let count = 0;
for (let k of Array.from(etcdStore.keys())) {
if (k.startsWith(key)) {
etcdStore.delete(k);
count++;
}
}
addOutput(`Deleted ${count} keys with prefix ${key}`);
} else {
if (etcdStore.delete(key)) {
addOutput(`Deleted ${key}`);
} else {
addOutput('Key not found.');
}
}
triggerWatchers(key, 'DEL', null);
updateKeyCount();
updateStatus('DEL complete', 'success');
}
function executeWatch(args, flags) {
if (args.length < 1) throw new Error('WATCH requires a key');
const key = args[0];
const watchId = Math.random().toString(36).substr(2, 9);
if (!watchers.has(key)) watchers.set(key, []);
watchers.get(key).push({ id: watchId, prefix: flags.prefix || false });
addOutput(`Started watching: ${key}`, 'success');
if (flags.prefix) addOutput('Watching with prefix matching', 'success');
addOutput(`Watch ID: ${watchId}`);
addOutput('(Changes will appear here automatically)');
updateStatus('WATCH started', 'success');
}
function triggerWatchers(key, event, value) {
for (let [watchKey, watchList] of watchers) {
watchList.forEach(watcher => {
let shouldTrigger = false;
if (watcher.prefix && key.startsWith(watchKey)) shouldTrigger = true;
else if (!watcher.prefix && key === watchKey) shouldTrigger = true;
if (shouldTrigger) {
addOutput(`🔔 WATCH EVENT [${watcher.id}]`, 'warning');
addOutput(`Event: ${event}`);
addOutput(`Key: ${key}`);
if (value !== null) addOutput(`Value: ${value}`);
addOutput('---');
}
});
}
}
function executeCommand() {
const input = document.getElementById('commandInput');
if (!input) return;
const inputText = input.value.trim();
if (!inputText) return;
addOutput(`$ ${inputText}`);
if (currentMode === 'quiz' && currentQuestionIndex < questions.length) {
if (!userSolutions[currentQuestionIndex]) userSolutions[currentQuestionIndex] = { commands: [], completed: false };
userSolutions[currentQuestionIndex].commands.push(inputText.toLowerCase());
}
input.value = '';
try {
const { command, args, flags } = parseCommand(inputText);
switch (command.toLowerCase()) {
case 'put': executePut(args, flags); break;
case 'get': executeGet(args, flags); break;
case 'del': case 'delete': executeDel(args, flags); break;
case 'watch': executeWatch(args, flags); break;
default: throw new Error(`Unknown command: ${command}`);
}
} catch (error) {
addOutput(`Error: ${error.message}`, 'error');
updateStatus('Command failed', 'error');
}
addOutput('');
}
function handleKeyPress(event) {
if (event.key === 'Enter') {
executeCommand();
}
}
function insertCommand(cmd) {
const input = document.getElementById('commandInput');
if (input) {
input.value = cmd;
input.focus();
}
}
// Quiz functions
function setMode(mode) {
currentMode = mode;
document.getElementById('practiceBtn').classList.toggle('active', mode === 'practice');
document.getElementById('quizBtn').classList.toggle('active', mode === 'quiz');
document.getElementById('quizSection').style.display = mode === 'quiz' ? 'block' : 'none';
if (mode === 'quiz') {
currentQuestionIndex = 0;
userSolutions = [];
loadCurrentQuestion();
}
}
function loadCurrentQuestion() {
if (currentQuestionIndex >= questions.length) {
showCompletion();
return;
}
const question = questions[currentQuestionIndex];
document.getElementById('currentQuestion').textContent = `${question.level}: ${question.title}`;
document.getElementById('questionText').textContent = question.text;
document.getElementById('questionHint').textContent = question.hint;
document.getElementById('questionHint').style.display = 'none';
document.getElementById('questionNum').textContent = currentQuestionIndex + 1;
document.getElementById('totalQuestions').textContent = questions.length;
document.getElementById('nextBtn').style.display = 'none';
if (!userSolutions[currentQuestionIndex]) {
userSolutions[currentQuestionIndex] = { commands: [], completed: false };
}
addOutput(`\n=== Question ${currentQuestionIndex + 1} of ${questions.length} ===`, 'success');
addOutput(`${question.level} Level: ${question.title}`, 'success');
addOutput(`${question.text}`, 'success');
addOutput('');
}
function showHint() {
document.getElementById('questionHint').style.display = 'block';
}
function checkAnswer() {
const question = questions[currentQuestionIndex];
const solution = userSolutions[currentQuestionIndex];
if (!solution || solution.commands.length === 0) {
addOutput('❌ No commands executed yet! Try running some etcd commands first.', 'error');
return;
}
const isCorrect = question.validation(solution.commands, etcdStore);
if (isCorrect) {
addOutput('🎉 Excellent! You\'ve successfully completed this challenge!', 'success');
addOutput(`✅ Question ${currentQuestionIndex + 1}: ${question.title} - COMPLETED`, 'success');
solution.completed = true;
document.getElementById('nextBtn').style.display = 'inline-block';
updateStatus('Question completed!', 'success');
if (currentQuestionIndex < questions.length - 1) {
addOutput('✨ Great! Moving to the next question in 3 seconds...', 'success');
setTimeout(() => { nextQuestion(); }, 3000);
}
} else {
addOutput('❌ Not quite right. Check the hint and try again!', 'error');
addOutput('Make sure you\'re following all the requirements in the question.', 'warning');
updateStatus('Try again', 'error');
}
}
function nextQuestion() {
currentQuestionIndex++;
if (currentQuestionIndex < questions.length) {
loadCurrentQuestion();
updateStatus(`Question ${currentQuestionIndex + 1} loaded`, 'success');
} else {
showCompletion();
}
}
function skipQuestion() {
addOutput(`⏭️ Skipping Question ${currentQuestionIndex + 1}`, 'warning');
userSolutions[currentQuestionIndex] = { commands: [], completed: false };
nextQuestion();
}
function resetQuiz() {
currentQuestionIndex = 0;
userSolutions = [];
etcdStore.clear();
watchers.clear();
leases.clear();
clearOutput();
addOutput('Quiz reset! Starting from Question 1...\n', 'warning');
loadCurrentQuestion();
updateStatus('Quiz reset', 'warning');
updateKeyCount();
}
function showCompletion() {
const completedCount = userSolutions.filter(s => s && s.completed).length;
addOutput(`\n🎊 QUIZ COMPLETED! 🎊`, 'success');
addOutput(`You completed ${completedCount} out of ${questions.length} questions.`, 'success');
if (completedCount === questions.length) {
addOutput('🏆 Perfect score! You\'ve mastered etcd basics!', 'success');
} else if (completedCount >= questions.length * 0.7) {
addOutput('👍 Great job! You have a solid understanding of etcd.', 'success');
} else {
addOutput('📚 Good effort! Review the concepts and try again for better mastery.', 'warning');
}
addOutput('Feel free to continue practicing in Free Practice mode!', 'success');
updateStatus('Quiz completed!', 'success');
}
</script>
</body>
</html>