A company runs an application on Amazon EC2 instances that are in an Amazon EC2 Auto Scaling group. Scale-out actions take a long time to become complete because of long-running boot scripts. A SysOps administrator must implement a solution to reduce the required time for scale-out actions without overprovisioning the Auto Scaling group.
Which solution will meet these requirements?
The best solution to reduce the required time for scale-out actions without overprovisioning is to add a warm pool to the Auto Scaling group. Warm pools allow you to maintain a pool of pre-initialized instances that are ready to be brought online quickly. These instances have already completed their boot scripts and initialization, so when a scale-out action is triggered, they can become operational much faster. This directly addresses the issue of long-running boot scripts, reducing the time required for scale-out actions.
It's D. Warm pools are used to have a group of instances already booted in stand-by to avoid initial scripts delay.
D is answer
D. Add a warm pool to the Auto Scaling group.
warm pools do not directly address the issue of reducing the required time for scale-out actions caused by long-running boot scripts. Warm pools can help with quicker scaling by having pre-initialized instances, but they do not optimize the scaling process or reduce the impact of boot scripts during scale-out. The correct approach to address the issue of long-running boot scripts and reduce the time for scale-out actions is to use predictive scaling, which is achieved through option C
A warm pool gives you the ability to decrease latency for your applications that have exceptionally long boot times, for example, because instances need to write massive amounts of data to disk. With warm pools, you no longer have to over-provision your Auto Scaling groups to manage latency in order to improve application performance. Hence the correct answer is D. Source: https://docs.aws.amazon.com/autoscaling/ec2/userguide/ec2-auto-scaling-warm-pools.html
yes, D is correct
warm pools contain instances that are already past boot scripts and have fully loaded the OS
need warm pool to a quick scale out
D it is
A - does not directly address the issue of long-running boot scripts, which is the primary cause of the slow scale-out actions. B - lead to overprovisioning, which the requirement explicitly wants to avoid. C - does not directly reduce the time required for the instances to become operational once they are launched. D: Warm pools allow you to maintain a pool of pre-initialized instances that are ready to go online quickly. These instances have already completed their boot scripts and initialization, so when a scale-out action is triggered, the instances can be brought online much faster. This solution directly addresses the issue of long-running boot scripts and reduces the time required for scale-out actions without overprovisioning the Auto Scaling group.