Q: What is the difference between vertical and horizontal scaling and which does AWS encourage?
Vertical = bigger instance. Horizontal = more instances. AWS encourages horizontal (Auto Scaling Groups, ECS/EKS). Vertical is limited (m...
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🎙️ Candidate Opening & Architectural Context
""AWS reliability requires differentiating between AWS control plane limits and host-level resource exhaustion. 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
Vertical = bigger instance. Horizontal = more instances. AWS encourages horizontal (Auto Scaling Groups, ECS/EKS). Vertical is limited (max instance size) and requires downtime. Horizontal is theoretically unlimited and can be automated.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: Vertical = bigger instance. Horizontal = more instances. AWS encourages horizontal (Auto Scaling Groups, ECS/EKS). Vertical is lim."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: Vertical = bigger instance. Horizontal = more instances. AWS encourages horizontal (Auto Scalin
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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