Q: What is AWS PrivateLink and how does it differ from VPC Peering?
PrivateLink: exposes a specific service (not a whole network) from one VPC to another. Traffic goes through AWS backbone. Supports cross-...
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🎙️ Candidate Opening & Architectural Context
""When an interviewer asks how I troubleshoot this in AWS, I frame it through my hands-on production experience. 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
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Production Solution & Architecture
PrivateLink: exposes a specific service (not a whole network) from one VPC to another. Traffic goes through AWS backbone. Supports cross-account and even cross-org. No routing conflicts, no overlapping CIDR issues. VPC Peering: connects two entire VPCs. All resources in both VPCs can communicate. More permissive, simpler for full VPC connectivity.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: PrivateLink: exposes a specific service (not a whole network) from one VPC to another. Traffic goes through AWS backbone. Supports."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: PrivateLink: exposes a specific service (not a whole network) from one VPC to another. Traffic
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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