Optimizing web application performance and reliability is critical in the digital age. The AWS Application Load Balancer (ALB) enhances traffic distribution across multiple EC2 instances, streamlining scalability and uptime. This guide, complemented by a video demo, shows you how to configure an ALB with Amazon Linux EC2 instances, ensuring your setup is efficient and secure.

1. Launching Two EC2 Instances:

Begin by launching two micro.t2 Amazon Linux free tier EC2 instances. Incorporate the following user data script to automatically install a web server and display the instance's IP address on your website:

# Use this for your user data (script from top to bottom)
# install httpd (Linux 2 version)
yum update -y
yum install -y httpd
systemctl start httpd
systemctl enable httpd
echo "<h1>Hello World from $(hostname -f)</h1>" > /var/www/html/index.html
2. Creating a Target Group:

After setting up the EC2 instances, create a target group for the ALB, adding the two instances as targets. This group directs the incoming web traffic to your instances.

3. Configuring a Security Group for the Load Balancer:

Set up a security group for the ALB, allowing all HTTP connections on port 80 to ensure the web traffic reaches the load balancer securely.

4. Deploying the Application Load Balancer:

Proceed to create the Application Load Balancer and integrate it with your target group. This setup enables the ALB to efficiently distribute incoming traffic between the EC2 instances.

5. Updating EC2 Instance Security Groups:

Enhance your setup's security by updating the EC2 instances' security groups to only allow inbound traffic from the ALB. This is achieved by pointing a new rule to the ALB's security group, ensuring instances are accessible solely through the load balancer.

6. Demonstrating Load Balancing in Action:

Using the ALB's DNS name to access the web application, you'll see the IP address toggle between instances upon refreshing the page, showcasing the ALB's traffic management capabilities.

Conclusion and Next Steps:

Setting up an AWS Application Load Balancer significantly increases your web application's scalability and reliability. This guide has equipped you with the knowledge to deploy an ALB, enhancing your application's performance and security.

Next Steps: To further scale your application, explore AWS Auto Scaling. This next step optimizes resource utilization and cost by automatically adjusting EC2 instances based on demand, a perfect strategy for growth-focused applications.

Dive into the video demonstration for a detailed walkthrough of each step, ensuring you're well-prepared to employ AWS Application Load Balancer for your web applications. Happy deploying!