AWS Certified SysOps Administrator – Associate (SOA-C03) — Question 10

A company runs a business application on more than 300 Linux-based instances. Each instance has the AWS Systems Manager Agent (SSM Agent) installed. The company expects the number of instances to grow in the future. All business application instances have the same user-defined tag.
A CloudOps engineer wants to run a command on all the business application instances to download and install a package from a private repository. To avoid overwhelming the repository, the CloudOps engineer wants to ensure that no more than 30 downloads occur at one time.
Which solution will meet this requirement in the MOST operationally efficient way?

Answer options

• A. Use a secondary tag to create 10 batches of 30 instances each. Use a Systems Manager Run Command document to download and install the package. Specify the target as part of the Run Command document by using the secondary tag. Run each batch one time.
• B. Use an AWS Lambda function to automatically run a Systems Manager Run Command document that roads a list of instance IDs that have the user-defined tag. Set reserved concurrency for the Lambda function to 30.
• C. Use a Systems Manager Run Command document to download and install the package. Use rate control to set concurrency to 30. Specify the target by using the user-defined tag as part of the Run Command document.
• D. Use a parallel workflow state in AWS Step Functions to automatically run a Systems Manager Run Command document that reads a list of instance IDs that have the user-defined tag. Set the number of parallel states to 30. Run the Step Functions workflow 10 times.

Correct answer: C

Explanation

Option C is correct because it leverages rate control to limit the concurrent downloads to 30 directly within the Systems Manager Run Command document, making it the most operationally efficient method. Option A requires manual batching, which is less efficient. Option B uses AWS Lambda, which adds unnecessary complexity for this scenario. Option D involves Step Functions, which is also more complex than needed for this straightforward task.