In this video, we will design and explain a real-world AWS VPC architecture and practical explanation using public and private subnets.
You will learn:
✔ How AWS VPC works
✔ Difference between Public and Private Subnet
✔ How Internet Gateway works
✔ How NAT works
✔ How to attach these VPC with EC2 and working its scenarios
Docs :
4️⃣ Real-World Use Cases
✅ Example 1: Web Application (Most Common)
Scenario
• Public EC2: Bastion host
• Private EC2: Backend API / App server
Flow
• Users → Load Balancer (optional)
• DevOps → Bastion → App EC2
• App connects to DB (private)
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✅ Example 2: Database Security Setup
Scenario
• Public EC2: Bastion
• Private EC2: Database (MySQL / PostgreSQL)
Why
• DB must NEVER have public IP
• Only accessible from:
o Bastion
o App servers
Industry
• Fintech
• Healthcare
• Enterprise apps
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✅ Example 3: CI/CD Build & Deploy Servers
Scenario
• Public EC2: Jenkins runner / Bastion
• Private EC2: Build agents / internal services
Why
• Source code & secrets stay private
• Only controlled access for deployments
Used by
• DevOps teams
• Enterprise CI/CD pipelines
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✅ Example 4: Internal Microservices Architecture
Scenario
• Public EC2: API Gateway / Bastion
• Private EC2s:
o Auth service
o Order service
o Payment service
Why
• Microservices should not be internet-facing
• Communication happens internally via private IPs
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