Load Balancers — Complete Guide
Load Balancers — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of AWS Cloud Tutorial on Toolliyo Academy.
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AWS Cloud Tutorial · Lesson 23 of 100
Load Balancers
Core services → Projects
Core services · 1 — AWS basics · ~6 min · AWS — Compute Services
What is this?
Elastic Load Balancing distributes traffic across targets. ALB handles HTTP/HTTPS; NLB handles TCP/UDP with low latency.
Why should you care?
AwsVerse exposes HTTPS APIs through ALB with TLS termination and path-based routing to microservices.
See it live — copy this example
Run in AWS CloudShell / local AWS CLI v2, or follow the matching steps in the AWS Console (Free Tier).
aws elbv2 create-load-balancer \
--name awsverse-alb \
--subnets subnet-pub1a subnet-pub1b \
--security-groups sg-alb \
--scheme internet-facing \
--type applicationWhat happened?
- Creates an internet-facing ALB in two public subnets.
- Add listeners, target groups, and ACM certificate for HTTPS.
Practice next
- Create target group (HTTP:8080, health /health).
- Create ALB and register EC2 targets.
- Add HTTPS listener with ACM cert.
- Add path rule /payments/* to a second target group.
- Enable access logs to S3.
Remember
ALB = Layer 7 routing. NLB = Layer 4 performance. Always use health checks.
AwsVerse API edge
Three API versions run on different ports.
Outcome: ALB path rules route /v1, /v2, /v3 without three DNS names.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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