Q: What is the `replace_triggered_by` lifecycle argument?
Forces resource replacement when another resource changes. Example: replace EC2 instance whenever the launch template changes:
#Terraform #Use VPC ID from another module #L2 #IaC #Cloud Infrastructure #EC2
🎙️ Candidate Opening & Architectural Context
""When terraform plan shows unexpected changes, my golden rule is: never apply blindly. Investigate the diff first. 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
Forces resource replacement when another resource changes. Example: replace EC2 instance whenever the launch template changes:
lifecycle {
replace_triggered_by = [aws_launch_template.app]
}
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: Forces resource replacement when another resource changes. Example: replace EC2 instance whenever the launch template changes:."
⚡ 60-Second Elevator Pitch Talking Points
- Immediate Triage: Forces resource replacement when another resource changes. Example: replace EC2 instance whenev
- Run targeted verification commands before modifying configuration.
- Automate permanent guardrails (CI check, alerts, IaC policy) to prevent recurrence.
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