#Lab 03: Node.js DevOps Utilities

Build DevOps utility scripts with Node.js.

#🎯 Objectives

Create a deployment notification script
Build a log analyzer utility
Handle async operations properly

#📋 Prerequisites

Node.js 18+ installed
npm knowledge

#🔬 Lab Steps

#Step 1: Project Setup

bash

1mkdir devops-utils
2cd devops-utils
3npm init -y
4npm install axios chalk commander dotenv yaml

#Step 2: Create Deployment Notifier

Create notify.js:

javascript

1#!/usr/bin/env node
2
3const axios = require('axios');
4const chalk = require('chalk');
5
6async function sendSlackNotification(webhookUrl, message) {
7    try {
8        await axios.post(webhookUrl, {
9            text: message,
10            username: 'Deploy Bot',
11            icon_emoji: ':rocket:'
12        });
13        console.log(chalk.green('✅ Notification sent!'));
14    } catch (error) {
15        console.error(chalk.red('❌ Failed:', error.message));
16    }
17}
18
19async function main() {
20    const environment = process.argv[2] || 'staging';
21    const version = process.argv[3] || 'latest';
22    
23    const message = `🚀 *Deployment Complete*
24Environment: ${environment}
25Version: ${version}
26Time: ${new Date().toISOString()}`;
27    
28    console.log(chalk.blue('Deployment Notification:'));
29    console.log(message);
30    
31    // Uncomment with real webhook URL
32    // await sendSlackNotification(process.env.SLACK_WEBHOOK, message);
33}
34
35main();

#Step 3: Create Log Analyzer

Create analyze-logs.js:

javascript

1#!/usr/bin/env node
2
3const fs = require('fs').promises;
4const chalk = require('chalk');
5
6async function analyzeLogs(logFile) {
7    const content = await fs.readFile(logFile, 'utf-8');
8    const lines = content.split('\n').filter(Boolean);
9    
10    const stats = {
11        total: lines.length,
12        errors: 0,
13        warnings: 0,
14        info: 0
15    };
16    
17    for (const line of lines) {
18        if (line.includes('ERROR')) stats.errors++;
19        else if (line.includes('WARN')) stats.warnings++;
20        else if (line.includes('INFO')) stats.info++;
21    }
22    
23    console.log(chalk.bold('\n📊 Log Analysis Report\n'));
24    console.log(`Total Lines: ${stats.total}`);
25    console.log(chalk.red(`Errors: ${stats.errors}`));
26    console.log(chalk.yellow(`Warnings: ${stats.warnings}`));
27    console.log(chalk.blue(`Info: ${stats.info}`));
28    
29    return stats;
30}
31
32const logFile = process.argv[2] || 'app.log';
33analyzeLogs(logFile).catch(console.error);

#Step 4: Run the Utilities

bash

1# Create sample log
2echo "2024-01-01 INFO Starting server
32024-01-01 ERROR Database connection failed
42024-01-01 WARN High memory usage
52024-01-01 INFO Request processed" > app.log
6
7# Run analyzer
8node analyze-logs.js app.log
9
10# Run notifier
11node notify.js production v1.2.3

#✅ Success Criteria

Scripts run without errors
Log analyzer counts correctly
Notification format is clear

#🎓 What You Learned

Node.js file operations
HTTP requests with axios
CLI argument handling
Async/await patterns