CloudFormation Drift Detection: AWS Config + Lambda Auto-Remediation

Learn how to enforce CloudFormation stack drift detection at scale using AWS Config rules and Lambda-driven auto-remediation — a common architecture question in senior Cloud and DevOps interviews.

You'll learn:

• How AWS Config detects configuration drift against CloudFormation expected stack states using managed and custom rules
• Wiring an EventBridge rule to trigger a Lambda function when Config flags a stack as DRIFTED
• Lambda remediation patterns: re-running cloudformation detect-stack-drift vs. forcing a stack update to reconcile out-of-band changes
• Gotchas around drift detection cost, IAM permissions for the Config recorder, and distinguishing intentional changes from real drift
• How to scope remediation safely — alerting vs. hard auto-rollback and when each is appropriate in production

Keywords: CloudFormation drift detection, AWS Config auto-remediation, Lambda CloudFormation remediation, IaC drift enforcement, AWS Config rules interview

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