Load Balancing & Auto-Scaling Explained

Short summary

A beginner-friendly explainer on load balancing and auto-scaling covering how a single URL serves millions of users. It breaks down load balancers as a front door distributing traffic across stateless instances, with health checks removing unhealthy servers automatically. The article compares common routing algorithms (round-robin, least-connections, weighted, IP hash) and explains why stateless instances are essential for horizontal scaling.

• •Load balancers distribute traffic across identical stateless app instances
• •Auto-scalers add or remove instances based on metrics like CPU utilization
• •Health checks automatically route around failing servers without human intervention

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