Q: How do you implement zero-downtime Terraform changes for an ALB?
For listener rule changes: create new rule before deleting old. create_before_destroy. For target group changes: add new TG to ALB, shift...
#Terraform #Use VPC ID from another module #L3 #IaC #Cloud Infrastructure #ALB
🎙️ Candidate Opening & Architectural Context
""Managing infrastructure as code across multiple teams requires disciplined state management and locking. 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.""
Advertisement
🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Production Solution & Architecture
For listener rule changes: create new rule before deleting old. create_before_destroy. For target group changes: add new TG to ALB, shift traffic, remove old TG. Use weighted routing to gradually shift.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: For listener rule changes: create new rule before deleting old. create_before_destroy. For target group changes: add new TG to ALB."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: For listener rule changes: create new rule before deleting old. create_before_destroy. For targ
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
Advertisement