Overview

Elastic Load Balancer (ELB) offers advanced traffic handling features to improve

user session continuity, availability, security, and graceful instance shutdown.

This guide covers:

• Sticky Sessions
• Cross-Zone Load Balancing
• SSL Certificates & HTTPS
• Connection Draining (Deregistration Delay)

Each explained with a kaptaindevops scenario.

Sticky Sessions (Session Affinity)

What it does

Ensures a user is always routed to the same backend instance during a session.

Useful when servers store session data locally, like login or shopping cart state.

When to use

• E-commerce carts
• Logged-in web apps
• Stateful web sessions

ALB vs NLB Sticky Rules