In AWS, the lifecycle hook is a feature included in the auto scaling which helps to control instance launch and termination state within the auto scaling group. It remains in a waiting mode for a certain amount of time when the instance is paused. We can create lifecycle hooks by using the command

put-lifecycle-hook. Lifecycle hooks are also customizable with various actions such as by defining a target notification for the lifecycle hook, creating an instance running script as the instance starts or determining a CloudWatch Event target to invoke functions associated with the Lambda when the lifecycle action occurs.

BY Best Interview Question ON 26 Mar 2019