← 3 Users load balanced on different Ec2 Instances

Load Balancer = Traffic distributor across multiple servers

Why Use Load Balancer?

1. Distribute Traffic

• Spread load evenly across multiple instances
• No single server gets overloaded

2. Single Access Point

• Users access one DNS name (e.g., myapp.com)
• Don't need to remember multiple IPs

3. Handle Failures Automatically

• Detects when instance crashes
• Routes traffic only to healthy instances
• Users don't notice downtime

4. Health Checks

• Continuously monitors instance health
• Checks a specific endpoint (e.g., /health)
• Only sends traffic to healthy instances

Instance 1: /health → 200 OK     (Gets traffic)
Instance 2: /health → 500 Error  (No traffic)
Instance 3: /health → 200 OK     (Gets traffic)

5. SSL/TLS Termination

• Load Balancer handles HTTPS encryption/decryption
• EC2 instances receive plain HTTP internally