Which of these solutions would meet the requirements?

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In: SOA-C01
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A SysOps Administrator is responsible for managing a set of 12.micro Amazon EC2 instances.The Administrator wants to automatically reboot any instance that exceeds 80% CPU utilization.

Which of these solutions would meet the requirements?

Create an Amazon CloudWatch alarm on the CPUCreditBalance metric and specify a terminate alarm action.

Create an Amazon CloudWatch alarm on the CPUUtilization metric and specify a reboot alarm action.

Create an Amazon CloudWatch alarm on the CPUCreditBalance metric and specify a reboot alarm action.

Create an Amazon CloudWatch alarm on the CPUUtilization metric and specify a terminate alarm action.

Explanations:

The CPUCreditBalance metric measures burstable performance instances’ remaining CPU credits, not CPU utilization. A terminate action would not solve the requirement of rebooting instances based on high CPU usage.

The CPUUtilization metric tracks the percentage of CPU usage. A CloudWatch alarm with a reboot action would automatically reboot instances when their CPU usage exceeds 80%, fulfilling the requirement.

The CPUCreditBalance metric relates to burstable instances and does not track CPU utilization. A reboot action on this metric would not address the requirement to reboot based on CPU usage.

The CPUUtilization metric does track CPU usage, but a terminate alarm action would terminate the instance, not reboot it. This does not meet the requirement of rebooting instances based on high CPU usage.

2026-03-28

2 Comments

  1. Wayne
    Author

    In my experience, the answer is:
    Create an Amazon CloudWatch alarm on the CPUUtilization metric and specify a reboot alarm action.

  2. Lori
    Author

    My best guess is:
    Create an Amazon CloudWatch alarm on the CPUUtilization metric and specify a reboot alarm action.

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