Aws Cloudformation

This covers the full CloudFormation workflow: writing templates with secure defaults baked in, running validation through three layers (cfn-lint for syntax, cfn-guard for compliance, change sets for pre-deployment checks), and diagnosing failures by correlating stack events with specific error messages. The troubleshooting guidance is especially practical. It distinguishes between cascade failures during rollback and real errors, helps you spot parallel failures from shared root causes like missing IAM permissions, and tells you whether to fix the template or the environment. One thing to know: it emphasizes using the newer describe-events API with filters instead of describe-stack-events, which matters because the old API doesn't surface validation errors or support failure filtering.