[Solved] Given this AWS Auto Scaling group configuration snippet:{ "AutoScalingGroupName": "web-asg", "TargetGroupARNs":... | AWS

AWS - Auto Scaling

Given this AWS Auto Scaling group configuration snippet:

{
  "AutoScalingGroupName": "web-asg",
  "TargetGroupARNs": ["arn:aws:elasticloadbalancing:region:123456789012:targetgroup/web-tg/abc123"],
  "MinSize": 2,
  "MaxSize": 4,
  "DesiredCapacity": 3
}

What happens when one instance fails health checks in the ELB target group?

AAuto Scaling terminates the unhealthy instance and launches a new one to maintain desired capacity

BELB stops sending traffic but Auto Scaling does not replace the instance

CAuto Scaling increases MaxSize to 5 automatically

DNothing happens until manual intervention

Step-by-Step Solution

Solution:

Step 1: Understand health check integration
When an instance fails ELB health checks, Auto Scaling detects it as unhealthy.
Step 2: Auto Scaling response
Auto Scaling terminates the unhealthy instance and launches a new one to keep the desired capacity at 3.
Final Answer:
Auto Scaling terminates the unhealthy instance and launches a new one to maintain desired capacity -> Option A
Quick Check:
Unhealthy instance triggers replacement by Auto Scaling [OK]

Quick Trick: Auto Scaling replaces unhealthy instances to keep desired capacity [OK]

Common Mistakes:

Thinking ELB alone replaces instances
Assuming MaxSize changes automatically
Believing manual steps are needed

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More AWS Quizzes

Given this AWS Auto Scaling group configuration snippet:

Step 1: Understand health check integration

Step 2: Auto Scaling response

Final Answer:

Quick Check:

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