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Import And Export Data Between The Stacks In AWS CloudFormation

In this article, we will import and export data between the stacks in Cloudformation.

Scenario

In the example, we will create a stack that will create a bucket with the name gs-sourcebucket. We will then export the bucket name of the source bucket.

Second stack will import that bucket name and create the bucket with that name.

Stack Creation

First, create a stack from the template. Use the following JSON template.

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Metadata": {
    "AWS::CloudFormation::Designer": {
      "2dc4ba2f-ea15-4070-8c8e-4292600d411f": {
        "size": {
          "width": 60,
          "height": 60
        },
        "position": {
          "x": 523,
          "y": 122
        },
        "z": 0
      }
    }
  },
  "Resources": {
    "S3B33CKD": {
      "Type": "AWS::S3::Bucket",
      "Properties": {
        "BucketName": "gs-sourcebucket"
      },
      "Metadata": {
        "AWS::CloudFormation::Designer": {
          "id": "2dc4ba2f-ea15-4070-8c8e-4292600d411f"
        }
      }
    }
  },
  "Outputs": {
    "bucketname1": {
      "Description": "gs-source1bucket",
      "Value": "gs-source1bucket",
      "Export": {
        "Name": "gyansangrahbucketname"
      }
    }
  }
}

If you check the last section of the JSON, you will observe an attribute called Outputs. This attribute exports the value with the name gyansangrahbucketname.

Once the stack is created, you can see the exported value in the Exports menu.

Picture showing the value exported from stack

Click to Enlarge

In the similar manner, create another stack with the following template.

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Metadata": {
    "AWS::CloudFormation::Designer": {
      "2dc4ba2f-ea15-4070-8c8e-4292600d411f": {
        "size": {
          "width": 60,
          "height": 60
        },
        "position": {
          "x": 523,
          "y": 122
        },
        "z": 0
      }
    }
  },
  "Resources": {
    "S3B33CKD": {
      "Type": "AWS::S3::Bucket",
      "Properties": {
        "BucketName": { "Fn::ImportValue": "gyansangrahbucketname" }
      },
      "Metadata": {
        "AWS::CloudFormation::Designer": {
          "id": "2dc4ba2f-ea15-4070-8c8e-4292600d411f"
        }
      }
    }
  }  
}

In the above template, I am importing the value using this expression.

{ "Fn::ImportValue": "gyansangrahbucketname" }

Picture showing the second stack created from the imported values

Click to Enlarge

Output

You can see the S3 buckets created when both the stacks are executed.

Picture showing the bucket created from imported values from stack

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Tuesday, January 4, 2022

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