Explanation:
Amazon Machine Images (AMIs) are Region-specific. To use an AMI in a different Region, it must first be copied to that Region. Once the AMIs exist in the target Regions, using a Mappings section in an AWS CloudFormation template is the standard and most operationally efficient way to ensure the template can reference the correct AMI ID based on the Region where the stack is being deployed. This allows for a single template to be used across multiple Regions without manual intervention for each deployment.
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Question 4. A company asks a SysOps administrator to provision an additional environment for an application in four additional AWS Regions. The application is running on more than 100 Amazon C2 instances in the us-east-1 Region, using fully configured Amazon Machine Images (AMIs). The company has an AWS CloudFormation template to deploy resources in us-east-1. What should the SysOps administrator do to provision the application in the MOST operationally efficient manner?
A
Copy the AMI to each Region by using the aws ec2 copy-image command. Update the CloudFormation template to include mappings for the copied AMIs.
B
Create a snapshot of the running instance. Copy the snapshot to the other Regions. Create an AMI from the snapshots. Update the CloudFormation template for each Region to use the new AMI.
C
Run the existing CloudFormation template in each additional Region based on the success of the template that is used currently in us-east-1.
D
Update the CloudFormation template to include the additional Regions in the Auto Scaling group. Update the existing stack in us-east-1.
E
None
F
None
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