How to create multiple cloudformation stacks where a single parameter changes?

Question

I want to enter a list of cities as parameters to a SAM template. For Example: London, New York, Dubai. The list can have a large number of cities, say 50.

Using this list of cities, I want to create a log group pertaining to each city. For example:

• /aws/ecs/Dubai
• /aws/ecs/London
• /aws/ecs/New York

How can I achieve this?

Answer 1

You can use Count Macro in Cloudformation.

AWSTemplateFormatVersion: "2010-09-09"
Transform: Count
Resources:
   Type: AWS::Logs::LogGroup
   Properties: 
       LogGroupName: /aws/ecs/%s
   Count: ['Dubai','London','NewYork']

For more information check this question: How to loop through values in a CloudFormation template