Capstone Walkthrough: Building It Session by Session
~14 min read
The same architecture as a guided build sequence — the order a real project actually gets built in, and why each step depends on the one before it.
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Key points
- •Network foundation (VPC, subnets, gateways) always comes first — everything else is placed inside it
- •A golden AMI is built before Auto Scaling is configured, so new instances boot ready rather than bootstrapping from scratch on every scale-out
- •Security groups are locked down precisely only after the real resources exist to reference (ALB → EC2 → RDS, each layer only trusting the one in front of it)
- •DNS and CDN are added last, once the origin (ALB) is already live and tested directly