AWS Certified CloudOps Engineer - Associate
Troubleshooting CloudFormation Deployments
A method for failed deployments: find the first failure in the stack events, read the status reason, and match it to its class - permissions, capacity and subnet sizing, missing signals, resources that never stabilize, and rollbacks that themselves fail.
Advanced 28 minutes 7 Learning Objectives
- Locate the root cause of a failed deployment by reading stack events from the first failure
- Map a stack status to the operations it still permits, including ROLLBACK_COMPLETE and UPDATE_ROLLBACK_FAILED
- Diagnose permission failures and distinguish caller permissions from service role permissions
- Calculate usable subnet capacity and recognize deployment failures caused by address exhaustion or service quotas
- Explain why a CreationPolicy times out and where to find the evidence on the instance
- Recover a stack from UPDATE_ROLLBACK_FAILED, and state the consequence of skipping resources
- Select the right pre-deployment tool to catch a class of failure before it reaches AWS