This section covers the following official AWS Certified SysOps Administrator – Associate (SOA-C02) exam domains:
Domain 2: Reliability and Business Continuity
Domain 3: Deployment, Provisioning, and Automation
If you can correctly answer these questions before going through this section, save time by skimming the Exam Alerts in this section and then completing the Cram Quiz at the end of the section.
1. You are operating a forum application that consists of three layers: a web front end on EC2, an application on EC2, and a database layer RDS. The web front end delivers the static forum content and formatting, the application layer stores the session information for each user, and the database layer stores all the user preferences. Assess the scalability of this deployment, identify any issues, and propose a solution.
2. You have been tasked with troubleshooting an image-processing platform. The application resides on a single-layer ECS container deployment that accepts requests for image processing from an incoming S3 bucket and deposits the processed image in an output S3 bucket. Lately, a spike in usage has caused the ECS application to reach its maximum scale. Users using the paid platform have reported that bulk image uploads complete successfully to S3, but some images are never processed. As a result, users are left searching for unprocessed images and need to resubmit them for processing. How could you ensure that the application works as intended?
3. Your developers have updated the forum application as per your previous comments. Your application is now growing, and you have been tasked with ensuring the application maintains scalability to millions of users. To assess the scalability, you have been given more information on the deployment. The web front end uses Apache2 HTTPS servers on Ubuntu Linux on EC2. The application layer runs custom Python code on EC2 that connects to a DynamoDB table to store session data. The database layer is deployed on a Multi-AZ RDS MySQL cluster with two instances (primary and secondary). Assess the scalability of this deployment and identify any potential bottlenecks.
4. After you optimize the application, your clients report highly improved performance. After receiving the latest AWS bill, the CFO has questions about additional cost of the application. While examining the cost report, you find that the application layer seems to still be deployed with a static number of servers like it was before the session state was offloaded. How can you further optimize the application to reduce the cost?
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