AWS Certified Solutions Architect – Professional — Question 835

A company has developed a web application that runs on Amazon EC2 instances in one AWS Region. The company has taken on new business in other countries and must deploy its application into other regions to meet low-latency requirements for its users. The regions can be segregated, and an application running in one region does not need to communicate with instances in other regions.
How should the company's Solutions Architect automate the deployment of the application so that it can be MOST efficiently deployed into multiple regions?

Answer options

• A. Write a bash script that uses the AWS CLI to query the current state in one region and output a JSON representation. Pass the JSON representation to the AWS CLI, specifying the --region parameter to deploy the application to other regions.
• B. Write a bash script that uses the AWS CLI to query the current state in one region and output an AWS CloudFormation template. Create a CloudFormation stack from the template by using the AWS CLI, specifying the --region parameter to deploy the application to other regions.
• C. Write a CloudFormation template describing the application's infrastructure in the resources section. Create a CloudFormation stack from the template by using the AWS CLI, specify multiple regions using the --regions parameter to deploy the application.
• D. Write a CloudFormation template describing the application's infrastructure in the Resources section. Use a CloudFormation stack set from an administrator account to launch stack instances that deploy the application to other regions.

Correct answer: D

Explanation

AWS CloudFormation StackSets enable users to deploy stacks across multiple AWS accounts and Regions concurrently using a single template, representing the most efficient and native automation method. Options A and B are inefficient and complex because they rely on custom scripting to reverse-engineer and replicate resources. Option C is incorrect because the standard AWS CLI command for creating CloudFormation stacks does not support a --regions parameter to deploy to multiple regions simultaneously.