Q: How does AWS KMS work and when would you use customer-managed keys vs AWS-managed keys?
KMS generates and stores encryption keys. You never handle raw key material. AWS-managed keys: automatic rotation, free, no management ne...
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🎙️ Candidate Opening & Architectural Context
""In a previous role, our monitoring paged me for a similar incident across our AWS VPC infrastructure. 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
KMS generates and stores encryption keys. You never handle raw key material. AWS-managed keys: automatic rotation, free, no management needed — use for basic encryption. Customer-managed keys: you control rotation, key policy, who can use the key — required when: you need cross-account access, specific compliance requirements, need to disable/delete the key.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: KMS generates and stores encryption keys. You never handle raw key material. AWS-managed keys: automatic rotation, free, no manage."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: KMS generates and stores encryption keys. You never handle raw key material. AWS-managed keys:
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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