A software engineering team is using AWS CodeDeploy to deploy a new version of an...

AWS CodeDeploy supports automatic rollback capabilities, which allow the deployment to automatically revert to the last known good revision if a failure occurs during the deployment or if health checks fail.

You can enable automatic rollback on CodeDeploy deployments by configuring rollback settings in the deployment group.

Automatic rollback triggers can include failed deployments and alarms failing during the deployment lifecycle, which means if the health check fails, CodeDeploy will automatically roll back without manual intervention.

Lifecycle event hooks (Option A) provide custom scripting capabilities during deployment but do not provide built-in rollback automation.

CloudFormation (Option B) can deploy and manage infrastructure but does not control CodeDeploy rollback.

CloudWatch alarms (Option C) can trigger notifications but require manual or additional automation to trigger rollback.Hence, enabling CodeDeploy’s automatic rollback settings is the simplest and most reliable method for automatic rollback upon health check failure.

Reference from AWS Official Documentation and Study Guide:

AWS CodeDeploy Automatic Rollback:"You can configure automatic rollback in AWS CodeDeploy to roll back a deployment if it fails or if specified CloudWatch alarms are triggered."(AWS CodeDeploy User Guide - Automatic Rollbacks)

AWS Certified DevOps Engineer Professional Study Guide:"Leverage CodeDeploy automatic rollback features to reduce downtime and ensure application stability during deployments."