Q: EC2 instance in private subnet needs to call AWS APIs (e.g., S3, SSM). How without NAT Gateway?
Use VPC Endpoints — Interface Endpoints or Gateway Endpoints for S3 and DynamoDB. Traffic stays within AWS network. Cheaper than NAT.
#AWS #Cost & Architecture #L2 #Cloud #Infrastructure #EC2
🎙️ Candidate Opening & Architectural Context
""In our AWS cloud environment, we managed high-traffic microservices where this exact scenario occurred. When addressing this question, I walk the interviewer through our production incident runbook: isolating the blast radius, checking diagnostic logs and metrics, and applying a safe fix.""
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Production Solution & Architecture
Use VPC Endpoints — Interface Endpoints or Gateway Endpoints for S3 and DynamoDB. Traffic stays within AWS network. Cheaper than NAT.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: Use VPC Endpoints — Interface Endpoints or Gateway Endpoints for S3 and DynamoDB. Traffic stays within AWS network. Cheaper than N."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: Use VPC Endpoints — Interface Endpoints or Gateway Endpoints for S3 and DynamoDB. Traffic stays
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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