While learning AWS and cloud computing, I explored how a Classic Load Balancer (CLB) distributes incoming traffic across multiple EC2 instances.
🔹 What is a Classic Load Balancer?
A Classic Load Balancer (CLB) is an AWS load balancing service that distributes incoming requests from multiple clients across registered EC2 instances.
When clients send requests over the internet, the load balancer forwards those requests to healthy backend servers and returns the responses to the clients.
🔹 How Does It Work?
The traffic flow looks like this:
Clients → Internet → Classic Load Balancer → EC2 Instances → Response to Clients
For example, imagine an application running on two EC2 instances:
EC2 Instance 1: Handles some incoming requests.
EC2 Instance 2: Handles other incoming requests.
Classic Load Balancer: Distributes traffic across registered instances and avoids routing requests to instances identified as unhealthy.
This helps improve application availability, fault tolerance, and traffic distribution.
🔹 Benefits of Load Balancing
✅ Distributes incoming traffic across multiple servers.
✅ Improves application availability.
✅ Supports fault tolerance by routing traffic to healthy instances.
✅ Helps applications handle multiple client requests.
🔹 CLB vs ALB vs NLB
CLB is the older generation of AWS load balancers. For new applications, AWS generally recommends choosing a load balancer based on the application's requirements:
Classic Load Balancer (CLB): Older-generation load balancer.
Application Load Balancer (ALB): Best suited for HTTP/HTTPS applications and Layer 7 routing.
Network Load Balancer (NLB): Best suited for Layer 4 TCP/UDP/TLS traffic and applications requiring high performance.
🔹 What I Learned
I learned how a load balancer acts as an entry point for incoming application traffic and distributes requests across multiple backend servers instead of relying on a single EC2 instance.
This is an important concept for building highly available and scalable applications on AWS.
I'm continuing to explore AWS services and strengthen my cloud computing skills through hands-on learning.
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