How should the administrator ensure that the AWS Cloud Formation template is working in every region?

A SysOps administrator Is troubleshooting an AWS Cloud Formation template whereby multiple Amazon EC2 instances are being created

The template is working In us-east-1. but it is failing In us-west-2 with the error code:

How should the administrator ensure that the AWS Cloud Formation template is working in every region?
A . Copy the source region’s Amazon Machine Image (AMI) to the destination region and assign it the same ID.
B . Edit the AWS CloudFormatton template to specify the region code as part of the fully qualified AMI ID.
C . Edit the AWS CloudFormatton template to offer a drop-down list of all AMIs to the user by using the aws :: EC2:: ami :: imageiD control.
D . Modify the AWS CloudFormation template by including the AMI IDs in the "Mappings" section. Refer to the proper mapping within the template for the proper AMI ID.

View Answer

Answer: D

Explanation:

To ensure that the AWS CloudFormation template works in every region, you should use the Mappings section to specify region-specific AMI IDs. This allows the template to dynamically reference the correct AMI ID based on the region where the stack is being deployed.

Steps:

Add Mappings to the Template:

Define the AMI IDs for each region in the Mappings section of the CloudFormation template.

json

Copy code

{

"Mappings": {

"RegionMap": {

"us-east-1": { "AMI": "ami-0123456789abcdef0" },

"us-west-2": { "AMI": "ami-abcdef0123456789" }

}

}

}

Reference the Mapping in the Template:

Use the Fn::FindInMap function to reference the correct AMI ID based on the region.

json

Copy code

{

"Resources": {

"MyEC2Instance": {

"Type": "AWS::EC2::Instance",

"Properties": {

"ImageId": { "Fn::FindInMap": [ "RegionMap", { "Ref": "AWS::Region" }, "AMI" ] },

…

}

}

}

}

Deploy the Template:

Deploy the CloudFormation stack in any region, and it will use the correct AMI ID.

Reference: AWS CloudFormation Mappings