Q: You need to store application state for a session-based web app deployed across multiple EC2 instances. Where do you store sessions?
ElastiCache Redis — shared in-memory store that all instances can access. Never store sessions in local EC2 memory (breaks when an instan...
#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
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Production Solution & Architecture
ElastiCache Redis — shared in-memory store that all instances can access. Never store sessions in local EC2 memory (breaks when an instance is replaced) or in cookies (security risk for sensitive data).
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: ElastiCache Redis — shared in-memory store that all instances can access. Never store sessions in local EC2 memory (breaks when an."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: ElastiCache Redis — shared in-memory store that all instances can access. Never store sessions
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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