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Exam AWS-SysOps topic 1 question 258 discussion

Exam question from Amazon's AWS-SysOps
Question #: 258
Topic #: 1
[All AWS-SysOps Questions]

An organization has configured Auto Scaling for hosting their application. The system admin wants to understand the Auto Scaling health check process. If the instance is unhealthy, Auto Scaling launches an instance and terminates the unhealthy instance. What is the order execution?

  • A. Auto Scaling launches a new instance first and then terminates the unhealthy instance
  • B. Auto Scaling performs the launch and terminate processes in a random order
  • C. Auto Scaling launches and terminates the instances simultaneously
  • D. Auto Scaling terminates the instance first and then launches a new instance
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Suggested Answer: D 🗳️
Auto Scaling keeps checking the health of the instances at regular intervals and marks the instance for replacement when it is unhealthy. The ReplaceUnhealthy process terminates instances which are marked as unhealthy and subsequently creates new instances to replace them. This process first terminates the instance and then launches a new instance.
by awscertified at March 11, 2020, 11:58 p.m.
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albert_kuo
8 months, 3 weeks ago
Selected Answer: A
When an instance is deemed unhealthy and Auto Scaling triggers a scaling action to replace it, the typical order of execution is that Auto Scaling first launches a new instance to replace the unhealthy one. Once the new instance is up and running and passes the health checks, Auto Scaling then terminates the unhealthy instance. This ensures that there is a healthy instance available before terminating the problematic one, helping to maintain the desired capacity and availability of the application.
upvoted 1 times
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Thabo_Ramoshai
2 years, 7 months ago
I do not agree with the answer "D". Yes the instance is unhealthy but its still answering the requests and terminating it first might add to the impact. Launch first and terminate after. I'll go with "A"
upvoted 3 times
MrCarter
2 years, 7 months ago
Usually, if it is unhealthy it is not responding to requests anyway and therefore the impact is already there and not added when the instance is terminated. In fact, it is the best choice otherwise you will be billed for an extra EC2 instance before the unhealthy instance gets taken down.
upvoted 3 times
MrCarter
2 years, 6 months ago
Therefore, the answer is D
upvoted 2 times
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awscertified
2 years, 7 months ago
D. Auto Scaling terminates the instance first and then launches a new instance
upvoted 4 times
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