Exam AWS-SysOps topic 1 question 281 discussion

If an instance has been marked for replacement due to a failed health check triggered by a manual reboot, you can manually change the health status of the instance back to "healthy" using Auto Scaling commands. This would prevent the instance from being terminated and replaced. You can do this by issuing Auto Scaling commands to set the health status of the instance to "healthy," overriding the failed health check status.

Correct Answer: D

D https://docs.aws.amazon.com/autoscaling/ec2/userguide/healthcheck.html "After an instance has been marked unhealthy because of an Amazon EC2 or Elastic Load Balancing health check, it is almost immediately scheduled for replacement. It never automatically recovers its health. You can intervene manually by calling the SetInstanceHealth action (or the set-instance-health command) to set the instance's health status back to healthy. If the instance is already terminating, you get an error. Because the interval between marking an instance unhealthy and its actual termination is so small, attempting to set an instance's health status back to healthy with the SetInstanceHealth action (or, set-instance-health command) is probably useful only for a suspended group. For more information, see Suspending and Resuming Scaling Processes. "

D. Change the health of the instance to healthy using the Auto Scaling commands