Topic 1 Question 145

AWS Certified Solutions Architect - Associate

Topic 1 Question 145
A company hosts a website analytics application on a single Amazon EC2 On-Demand Instance. The analytics software is written in PHP and uses a MySQL database. The analytics software, the web server that provides PHP, and the database server are all hosted on the EC2 instance. The application is showing signs of performance degradation during busy times and is presenting 5xx errors. The company needs to make the application scale seamlessly. Which solution will meet these requirements MOST cost-effectively?
- Migrate the database to an Amazon RDS for MySQL DB instance. Create an AMI of the web application. Use the AMI to launch a second EC2 On-Demand Instance. Use an Application Load Balancer to distribute the load to each EC2 instance.
- Migrate the database to an Amazon RDS for MySQL DB instance. Create an AMI of the web application. Use the AMI to launch a second EC2 On-Demand Instance. Use Amazon Route 53 weighted routing to distribute the load across the two EC2 instances.
- Migrate the database to an Amazon Aurora MySQL DB instance. Create an AWS Lambda function to stop the EC2 instance and change the instance type. Create an Amazon CloudWatch alarm to invoke the Lambda function when CPU utilization surpasses 75%.
- Migrate the database to an Amazon Aurora MySQL DB instance. Create an AMI of the web application. Apply the AMI to a launch template. Create an Auto Scaling group with the launch template Configure the launch template to use a Spot Fleet. Attach an Application Load Balancer to the Auto Scaling group.
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- But I have a question,
  For Spot instance, is it possible that at some time there is no spot resources available at all? because it is not guaranteed, right?
  
  👍 4
  gustavtd2023/01/02
- 正解だと思う選択肢: D
  "You can submit a Spot Fleet as a one-time request, which does not persist after the instances have been terminated. You can include On-Demand Instance requests in a Spot Fleet request."
  
  https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-fleet.html
  
  👍 3
  Certified1012022/12/14
- 正解だと思う選択肢: D
  Option D is the most cost-effective solution that meets the requirements.
  
  Migrating the database to Amazon Aurora MySQL will allow the database to scale automatically, so it can handle an increase in traffic without manual intervention. Creating an AMI of the web application and using a launch template will allow the company to quickly and easily launch new instances of the application, which can then be added to an Auto Scaling group. This will allow the application to automatically scale up and down based on demand, ensuring that there are enough resources to handle busy times without incurring the cost of running idle resources.
  
  Using a Spot Fleet to launch the instances will allow the company to take advantage of Amazon's spare capacity and get a discount on their EC2 instances. Attaching an Application Load Balancer to the Auto Scaling group will allow the load to be distributed across all of the available instances, improving the performance and reliability of the application.
  
  👍 3
  Zerotn32023/01/01
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