Q: Provide three immutable infrastructure practices.
1. Never SSH and patch: If an EC2 instance needs a security update or a configuration change, you never SSH into the live server to run a...
#General DevOps #General DevOps — Scenario-Based Interview Questions #L1 #DevOps #SRE #Architecture
🎙️ Candidate Opening & Architectural Context
""Senior DevOps is about building reliable automated feedback loops between code commit and production observability. The interviewer is testing: Pet vs Cattle concept, Configuration Management vs Baking AMIs.. I structure my answer around systematic triage first, root cause analysis second, and permanent remediation third.""
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Initial Diagnostics & Root Cause Analysis
- Never SSH and patch: If an EC2 instance needs a security update or a configuration change, you never SSH into the live server to run
apt-get upgradeor edit a config file. This creates "snowflakes". - Bake Images (AMI Builder/Packer): The new configuration is scripted via Packer or Docker. A fresh, fully-configured Amazon Machine Image (AMI) or Docker Image is stamped out into an artifact registry.
- Replace, don't update: The infrastructure orchestrator (Terraform/Auto Scaling Group) terminates the old instances completely and spawns identical fresh instances from the newly baked image.
2️⃣
Remediation & Permanent Safeguards
Execute the resolution runbook and verify workload health:
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: Never SSH and patch: If an EC2 instance needs a security update or a configuration change, you never SSH into the live server to r."
⚡ 60-Second Elevator Pitch Talking Points
- Never SSH and patch: If an EC2 instance needs a security update or a configuration change, you ne...
- Bake Images (AMI Builder/Packer): The new configuration is scripted via Packer or Docker. A fresh...
- Replace, don't update: The infrastructure orchestrator (Terraform/Auto Scaling Group) terminates ...
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