DNS-Based Load Balancing & Global Traffic Management
Scale across multi-region datacenters: Round Robin DNS, Geo-DNS, Latency-Based Routing, Weighted Routing, Route53 Health Checks, and TTL failover dynamics.
01.1. What is DNS-Based Load Balancing (GSLB)?
Global Server Load Balancing (GSLB) operates at the very first step of the internet connection lifecycle: DNS Resolution.
Unlike a standard load balancer (ALB/HAProxy) which operates inside a single data center or cloud VPC, DNS-based load balancing operates across entire geographic regions and multi-cloud data centers. When a client asks "What is the IP address of api.example.com?", an intelligent authoritative nameserver (e.g., AWS Route 53, Cloudflare, Akamai, NS1) inspects real-time telemetry and returns a specific IP address tailored to that user.
DNS-Based Global Server Load Balancing (GSLB) & Multi-Region Failover 🌐
DNS-Based Global Server Load Balancing (GSLB) & Multi-Region Failover 🌐
How Authoritative GeoDNS and Latency-Based Routing dispatch global clients to the closest healthy regional data center, with automated health-check failover.
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