Why would this template fail to deploy?

A SysOps administrator has an AWS CloudFormation template of the company’s existing infrastructure in us-west-2. The administrator attempts to use the template to launch a new stack in eu-west-1, but the stack only partially deploys, receives an error message, and then rolls back.

Why would this template fail to deploy? (Select TWO.)
A . The template referenced an IAM user that is not available in eu-west-1.
B . The template referenced an Amazon Machine Image (AMI) that is not available in eu-west-1.
C . The template did not have the proper level of permissions to deploy the resources.
D . The template requested services that do not exist in eu-west-1.
E . CloudFormation templates can be used only to update existing services.

View Answer

Answer: BD

Explanation:

When attempting to deploy a CloudFormation template from one region (us-west-2) to another (eu-west-1), the deployment might fail due to region-specific resources and services.

Amazon Machine Image (AMI) Availability:

AMIs are region-specific. If the template references an AMI that is only available in us-west-2 and not in eu-west-1, the stack will fail to deploy in eu-west-1.

To resolve this, identify the AMI used in us-west-2 and find or create a similar AMI in eu-west-1.

Service Availability:

Some AWS services are not available in all regions. If the template includes resources or services that are not available in eu-west-1, the stack will fail.

Check the AWS Regional Services List to ensure all services and resource types in the template are available in eu-west-1.

Reference: Copy an AMI

AWS Regional Services List