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How to do it...

In a new file, define the template version and description:

      AWSTemplateFormatVersion: "2010-09-09"        Description: Create a weighted DNS setup for canary deployments.

Start the Parameters section and the required parameters:

      Parameters:         HostedZoneName:           Type: String           Description: The hosted zone to create records in          DomainName:           Type: String           Description: The domain name to create in the hosted zone          OldResource:           Type: String           Description: The older resource domain name          NewResource:           Type: String           Description: The newer resource domain name

Include the optional parameters (such as those with defaults) in the Parameters section:

      OldWeight:         Type: Number         Default: 1  Description: The ratio of requests to send ...

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