Tech2Towards: Configure ALB with Auto Scaling

In This Blog We are going to Configure AWS Application load Balancer with Auto Scaling Group with Demo Project.

Step 1: Launch an EC2 Instance and Prepare AMI

👉 Launch EC2 Instance.

Install Demo Script:

#!/bin/bash

# Install Apache and PHP
sudo apt update
sudo apt install php stress apache2 -y

# Create index.php with the provided HTML and PHP code
cat <<'EOF' | sudo tee /var/www/html/index.php > /dev/null
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Server Information</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f9;
            color: #333;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        .container {
            text-align: center;
            background: #ffffff;
            padding: 30px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            width: 60%;
            max-width: 500px;
        }

        h1, h2 {
            margin: 10px 0;
        }

        h1 {
            font-size: 2.5em;
            color: #007bff;
        }

        h2 {
            font-size: 1.8em;
            color: #28a745;
        }

        .footer {
            margin-top: 20px;
            font-size: 0.9em;
            color: #777;
        }
    </style>
</head>
<body>
    <div class="container">
        <?php
            echo "<h2>Machine Private IP Address: " . $_SERVER['SERVER_ADDR'] . "</h2>";
        ?>
        <div class="footer">
            <p1>Subscribe Our Youtube Channel: tech2towards</p1>
        </div>
    </div>
</body>
</html>
EOF

sudo rm -rf /var/www/html/index.html

Step 2: Set Up Application Load Balancer (ALB)

👉 Create Application Load Balancer.

Name: My-ALB
Scheme: Internet-facing (for public access).
Availability Zones: Choose at least two AZs for redundancy.
Security Group
Listeners: HTTP (Port 80) Or HTTPS (Port 443).

👉 Create Target Group:

Target Type: Instance.
Name: My-TG
Health Check: HTTP, `/` endpoint.
Register your EC2 instances

👉 Back To Our Previous Tab:

Select Target Group
Click On create load balancer

Step 3: Create EC2 AMI and Launch Template For Auto Scaling Group.

👉 Create EC2 AMI

👉 Create Launch Template

Name:My-LT
Selected Created AMI
Instance Type : t2.medium
Key Pair : Selected Existing
Security Group : Selected Existing

Step 4: Set Up Auto Scaling Group (ASG)

👉 Create Auto Scaling Group:

Name :My-ASG
Select the previously created Launch Template.
Leave As Default and Next

👉 Load Balancing:Attach to an existing load balancer

Select the previously created Target Group.
Leave As Default and Next

👉 Configure Group Size:

Set Desired Capacity (e.g., 2 instances).
Set Minimum Capacity (e.g., 2 instances).
Set Maximum Capacity (e.g., 5 instances).

👉 Configure Target Scaling Policies:

Scale based on CPU utilization (e.g., > 60%).

👉 Add Notifications (Optional):

Step 5: Test Load Balancer and Auto Scaling.

👉 Manually Stop the Current Running Instances.

Verify The New Instances Being Created or Not ?

👉 Execute The Stress cmd to put testing load on CPU.

stress --cpu 4 --timeout 600

👉 Verify The New Instances Being Created or Not ?

Step 6: Add SNS Notifications (Optional):

Step 7: Enable HTTPS (Optional)

Step 8: Monitoring and Logs (Optional)

Now Few Questions Should in Your Mind 🤔 ?

How to point a domain name to an Application Load Balancer ?
How to point a domain name to an ALB and enable HTTPS?
How to configure a Python project with auto-scaling?
How to configure a React project with auto-scaling?
How to configure a WordPress project with auto-scaling?
How to configure mysql database in auto-scaling scenario ?
What is the Cost Structure of Load Balancer and Auto Scaling?

Tech2Towards

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Thursday, December 19, 2024

Configure ALB with Auto Scaling

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