Core

CloudFormation change sets, drift, and failed rollback recovery

Use CloudFormation change sets and drift detection to review infrastructure changes, distinguish retention policies, and repair UPDATE_ROLLBACK_FAILED safely.

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RELATED CONCEPTS

Infrastructure State & Drift Terraform Drift Remediation RTO, RPO & Recovery Tests

PRACTICE THIS IN REAL QUESTIONS

Cloud Platforms & ArchitectureDesign a highly available three-tier application on AWS. What actually fails, and what does each layer of redundancy buy?→Cloud Platforms & ArchitectureEC2, ECS, Fargate, EKS or Lambda: how do you choose where a service runs on AWS?→CI/CD, Release Engineering & GitOpsBlue-green, canary or rolling for a payments API: pick one and defend the resource and rollback trade-off.→Cloud Platforms & ArchitectureSecurity groups versus network ACLs: explain stateful and stateless, and give me a case where the difference bites.→Cloud Platforms & ArchitectureWalk me through how an AWS IAM request is evaluated. Where does an explicit deny fit?→Cloud Platforms & ArchitectureYou need to connect forty VPCs plus on-premises. Peering, Transit Gateway or PrivateLink?→