Elastic Load Balancing (ELB) ले आने traffic लाई multiple targets (EC2 instances, containers, आदि) मा वितरण गर्छ — availability (कोनै पनि single point of failure नहुने) र scalability (load फैलाने) को सुधार गर्दै। यो reliable, scalable applications को लागि एक मुख्य component हो।
Load balancer ले गर्ने काम
A LOAD BALANCER sits in front of multiple backend targets and distributes requests:
Client → LOAD BALANCER → ┬→ Instance 1
├→ Instance 2
└→ Instance 3
→ spreads traffic across targets (scalability + no single instance overloaded)
→ HEALTH CHECKS: routes only to HEALTHY targets (an unhealthy one is bypassed)
→ if a target fails, traffic goes to the others → HIGH AVAILABILITY
→ single entry point (clients hit the LB, not individual instances)
