Q: An EC2 instance is making unexpected outbound connections to unknown IPs. What do you do?
1) Isolate: change security group to block all outbound. 2) Take a snapshot (forensics). 3) Check VPC Flow Logs for the outbound connecti...
#AWS #Cost & Architecture #L2 #Cloud #Infrastructure #EC2
🎙️ 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
1️⃣
Production Solution & Architecture
1) Isolate: change security group to block all outbound. 2) Take a snapshot (forensics). 3) Check VPC Flow Logs for the outbound connections. 4) Check GuardDuty findings. 5) Check running processes on instance. Likely compromised. Don't just terminate — preserve evidence first.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: 1) Isolate: change security group to block all outbound. 2) Take a snapshot (forensics). 3) Check VPC Flow Logs for the outbound c."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: 1) Isolate: change security group to block all outbound. 2) Take a snapshot (forensics). 3) Che
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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