const express = require('express');
const app = express();
const PORT = process.env.PORT || 3000;

let counter = 0;

app.get('/', (req, res) => {
  counter++;
  res.send(`
    <h2>Halo dari AWS Compute</h2>
    <p>Host: ${process.env.HOSTNAME || 'localhost'}</p>
    <p>Request ke-${counter} di instance ini</p>
    <p>Waktu: ${new Date().toISOString()}</p>
  `);
});

app.get('/health', (req, res) => {
  res.status(200).send('OK');
});

app.listen(PORT, () => {
  console.log(`App running on port ${PORT}`);
});
        

{
  "name": "aws-compute-demo",
  "version": "1.0.0",
  "scripts": {
    "start": "node app.js"
  },
  "dependencies": {
    "express": "^4.18.2"
  }
}
        

2.1 Persiapan Awal

• Buat akun AWS (Free Tier)
• Install AWS CLI dan konfigurasi (aws configure)
• Buat Key Pair (untuk SSH ke EC2)
• Buat Security Group dengan aturan: SSH (22), HTTP (80), dan Node.js (3000)

2.2 EC2 - Deploy Manual Pertama

1. Launch EC2 (Amazon Linux 2023, t2.micro)
2. SSH: ssh -i your-key.pem ec2-user@<public-ip>
3. Install Node.js: sudo dnf install nodejs npm -y
4. Upload kode (SCP atau Git clone)
5. Jalankan: npm install Kemudian Enter
6. Jalankan: node start Kemudian Enter, Jika Gagal Silahkan Ketikkan npm app.js
7. Akses via browser: http://<public-ip>:3000

2.3 Elastic Load Balancing (ELB)

1. Buat Application Load Balancer
2. Target Group → daftarkan EC2 di atas (port 3000)
3. Set health check endpoint /health
4. Update Security Group EC2 agar menerima traffic dari ALB
5. Akses melalui DNS name ALB → request akan terdistribusi

2.4 Auto Scaling Group (ASG)

1. Buat Launch Template (sertakan User-Data untuk install & start app)
2. Buat Auto Scaling Group: Min=1, Max=3, Desired=1
3. Hubungkan dengan Load Balancer di atas
4. Tambahkan scaling policy: misal CPU > 60% → +1 instance
5. Uji scaling dengan stress test (opsional)

#!/bin/bash
dnf install nodejs npm -y
cd /home/ec2-user
npm install
npm start
            

2.5 Elastic Beanstalk (Cara termudah)

1. Install EB CLI
2. eb init -p node.js my-eb-app --region us-east-1
3. eb create my-env --elb-type application
4. eb deploy (deploy aplikasi)
5. Beanstalk otomatis buat EC2, ASG, Load Balancer, health check!

2.6 AWS Lambda (Serverless)

1. Buat fungsi Lambda (Node.js 18.x)
2. Kode sederhana:

exports.handler = async (event) => {
    return {
        statusCode: 200,
        body: JSON.stringify({
            message: 'Halo dari Lambda!',
            time: new Date().toISOString()
        })
    };
};
            

3. Test di konsol Lambda
4. Buat Function URL atau API Gateway untuk akses publik

• Auto Scaling Group
• Load Balancer & Target Group
• Terminate EC2 instances
• Hapus Elastic Beanstalk environment
• Hapus Lambda function