1. Application Load Balancer works at…
- Layer 3 only
- Layer 7 (HTTP/HTTPS)
- Database layer
- IAM layer
ALB Basics
Source: doonops-curriculum/aws-alb--alb-intro.md
Doonops lesson
Goal
ALB spreads website visitors across multiple servers.
Simple explanation
One front door (DNS → ALB) → many waiters (EC2 targets) in kitchen.
Technical view
One front door (DNS → ALB) → many waiters (EC2 targets) in kitchen.
Think of it like
One front door (DNS → ALB) → many waiters (EC2 targets) in kitchen.
Steps
- Read simple section
- Read analogy + diagram
- Copy project files
- Do local lab
Deep explanation
Layman words first, then technical detail — read slowly
Layer 7 = understands HTTP (paths, headers). Target group = group of servers. Health check = ALB pings /health.
Example (Doonops)
Modern HCL — names are examples, not from any third-party course
Example HCL
# see project files
Terraform runs on your computer — copy this HCL into a folder, then follow the local lab steps below.
Quick check
- Explain topic to a friend in 2 sentences
- Did local lab steps
Project files for this lab
Full implementation folder — copy all files, then run terraform commands
Lab project files (full folder)
Copy every file below into one folder — same as a real repo module. Then run the local lab steps.
Suggested folder: Suggested path: ~/doonops-terraform/13-alb/
versions.tfSee file purpose in the code belowterraform {
required_version = ">= 1.9.0"
}
Module check — did you get it?
2–3 quick questions before the next module
ALB — quick check
Quick check — did this module stick?