AWS DevOps Engineer Professional Practice Test

How can a user ensure the application health during a CodeDeploy deployment?

1. Implement health checks with the ValidateService hook

2. Disable health checks during deployment

3. Wait for manual verification post-deployment

4. Use CloudWatch to monitor health

The correct answer is: Implement health checks with the ValidateService hook

Implementing health checks with the ValidateService hook is a proactive approach to ensure application health during a CodeDeploy deployment. The ValidateService hook allows you to specify a script that runs after the application is deployed but before the deployment is considered successful. This script can check the operational status of the application, such as ensuring that the necessary services are up and responsive, and that user access is functioning correctly. By integrating these health checks, you can catch any issues early, thereby increasing the reliability of the deployment process. If the checks fail, the deployment can be rolled back automatically, preventing any downtime or degradation of service. This is especially important in a production environment where application availability is critical. Other options do not provide the same level of assurance or monitoring during the deployment process. Disabling health checks would increase the risk of deploying non-functional code. Waiting for manual verification post-deployment could lead to longer downtime if issues arise, and while using CloudWatch to monitor health is important for ongoing service health, it doesn't directly ensure application health during the actual deployment phase.