AWS Certified CloudOps Engineer Associate SOA-C03 Practice Question

An application runs on a single Amazon EC2 instance. You must ensure the instance is automatically restored if a hardware failure occurs. The instance should recover when the CloudWatch metric StatusCheckFailed_System equals 1 for 5 consecutive minutes, without depending on additional AWS services or custom code. Which configuration achieves this requirement?

Create a CloudWatch alarm on StatusCheckFailed_System that publishes to an SNS topic which triggers a Lambda function calling the start-instances API.
Create a CloudWatch alarm on the StatusCheckFailed_System metric that uses the EC2 action "Recover this instance".
Attach an IAM role with AmazonSSMManagedInstanceCore to the instance and enable automatic recovery in Systems Manager.
Configure an EventBridge rule for EC2 Instance Status events that targets an Auto Scaling group with desired capacity 1.

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Answer Description

A CloudWatch metric alarm can invoke specific EC2 instance actions directly, including stop, terminate, reboot, and recover. By creating an alarm on the StatusCheckFailed_System metric and selecting the Recover this instance action, the service will automatically attempt to recover the instance when the metric breaches for the configured period, with no intermediate services or custom logic required. Publishing to SNS and triggering Lambda (choice 2) or routing through EventBridge and an Auto Scaling group (choice 3) would work but add unnecessary components. Attaching an IAM role and relying on Systems Manager (choice 4) does not enable automatic recovery; the CloudWatch alarm action is still required.

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