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AWS::Include transform - AWS CloudFormation

This topic describes how to use the AWS::Include transform to insert boilerplate content into your CloudFormation templates.

The AWS::Include is a CloudFormation macro that, when referenced in your stack template, inserts the contents of the specified file at the location of the transform in the template when you create or update a stack using a change set. The AWS::Include function behaves similarly to an include, copy, or import directive in programming languages.

You can use the AWS::Include transform anywhere within the CloudFormation template except in the template parameters section or the template version. For example, you can use AWS::Include in the mappings section.

To declare this transform at the top level of your CloudFormation template, as the Transform section, use the following syntax:

{
  "Transform":{
    "Name":"AWS::Include",
    "Parameters":{
      "Location":"s3://amzn-s3-demo-bucket/MyFileName.json"
    }
  },
  "Resources":{
    ...
  }
}

Transform:
  Name: 'AWS::Include'
  Parameters:
    Location: 's3://amzn-s3-demo-bucket/MyFileName.yaml'
Resources:
  ...

To declare this transform within a section of your CloudFormation template, use the Fn::Transform intrinsic function and the following syntax:

{
  "Fn::Transform":{
    "Name":"AWS::Include",
    "Parameters":{
      "Location":"s3://amzn-s3-demo-bucket/MyFileName.json"
    }
  }
}

'Fn::Transform':
  Name: 'AWS::Include'
  Parameters:
    Location: s3://amzn-s3-demo-bucket/MyFileName.yaml

For more information, see Fn::Transform.

Location

The location is an Amazon S3 URI, with a specific file name in an S3 bucket. For example, s3://amzn-s3-demo-bucket/MyFile.yaml.

When using AWS::Include, keep the following considerations in mind. For more considerations about using macros, see Macros considerations in the AWS CloudFormation User Guide.

• We currently support Amazon S3 URI, but no other Amazon S3 format (such as Amazon S3 ARN). It must be an Amazon S3 bucket, as opposed to something like a GitHub repository.

• Anyone with access to the Amazon S3 URL can include the snippet in their template.

• Your template snippets must be valid JSON.

• Your template snippets must be valid key-value objects, for example, "KeyName": "keyValue".

• You can't use AWS::Include to reference a template snippet that also uses AWS::Include.

• If your snippets change, your stack doesn't automatically pick up those changes. To get those changes, you must update the stack with the updated snippets. If you update your stack, make sure your included snippets haven't changed without your knowledge. To verify before updating the stack, check the change set.

• When creating templates and snippets, you can mix YAML and JSON template languages.

• We don't currently support using shorthand notations for YAML snippets.

• You can provide a cross-region replication Amazon S3 URI with AWS::Include. Make sure you check Amazon S3 bucket names when accessing cross-region replication objects. For more information, see Replicating objects within and across Regions in the Amazon S3 User Guide.

The following examples show how to use the AWS::Include transform to execute a wait condition handle. Replace amzn-s3-demo-bucket with your actual bucket name.

First, save a YAML file named single_wait_condition.yaml in your S3 bucket with the following contents:

MyWaitCondition:
  Type: AWS::CloudFormation::WaitCondition
  Properties:
    Handle: !Ref MyWaitHandle
    Timeout: '4500'

You can then reference this file using either JSON or YAML format.

{
   "Resources": {
      "MyWaitHandle": {
         "Type": "AWS::CloudFormation::WaitConditionHandle"
      },
      "Fn::Transform": {
         "Name": "AWS::Include",
         "Parameters": {
            "Location": "s3://amzn-s3-demo-bucket/single_wait_condition.yaml"
         }
      }
   }
}

Resources:
  MyWaitHandle:
    Type: AWS::CloudFormation::WaitConditionHandle
  'Fn::Transform':
    Name: 'AWS::Include'
    Parameters:
      Location: "s3://amzn-s3-demo-bucket/single_wait_condition.yaml"

For more information, see Create wait conditions in a CloudFormation template in the AWS CloudFormation User Guide.

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