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AWS Certified CloudOps Engineer Associate SOA-C03 Practice Question

A company runs hundreds of development EC2 instances tagged Environment=Dev. To reduce costs, the operations team must automatically stop these instances every weeknight at 7:00 p.m. and start them again at 7:00 a.m. the next business day. The solution must require no changes to the instances, rely only on AWS-managed services, and target resources by the Environment tag. Which approach meets these requirements MOST effectively?

  • Configure a CloudWatch alarm that triggers when instance CPU utilization is below 10% after 7:00 p.m.; have the alarm invoke a Lambda function that stops or starts instances based on the time of day.

  • Add a scheduled action to each Auto Scaling group that scales the group to zero at 7:00 p.m. and back to its original size at 7:00 a.m., using the Environment=Dev tag to select the instances.

  • Create an Amazon EventBridge rule with cron expressions for stop and start times that invokes Systems Manager Automation runbooks AWS-StopEC2Instance and AWS-StartEC2Instance, targeting instances with the Environment=Dev tag.

  • Enable AWS Compute Optimizer, filter recommendations by the Environment=Dev tag, and apply the generated rightsizing actions to stop and start the instances on the desired schedule.

AWS Certified CloudOps Engineer Associate SOA-C03
Monitoring, Logging, Analysis, Remediation, and Performance Optimization
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