An organization has setup Auto Scaling with ELB. Due to some man

ual error, one of the instances got rebooted. Thus, it failed the Auto Scaling health check. Auto Scaling has marked it for replacement. How can the system admin ensure that the instance does not get terminated?

A. Update the Auto Scaling group to ignore

the instance reboot event

B. It is not possible to change the status once it is marked for replacement

C. Manually add that instance to the Auto Scaling group after reboot to avoid replacement

D. Change the health of the instance to healthy using the A

uto Scaling commands

Explanation:

After an instance has been marked unhealthy by Auto Scaling, as a result of an Amazon EC2 or ELB health check, it is almost immediately scheduled for replacement as it will never automatically recover its heal

th. If the user knows that the instance is healthy then he can manually call the SetInstanceHealth action (or the as-setinstance- health command from CLI. to set the instances health status back to healthy. Auto Scaling will throw an error if the instance

is already terminating or else it will mark it healthy.