Extract CFN Stack Dependency

Extract CloudFormation stacks dependencies based on stack's exports and imports into a json file. You can provide stack name pattern using --pattern flag

Sample Output

Above command will create cfn-dependency.json json file in the working directory with the export and import

{
  "rbalman-dev-rds-network": { //StackName and its list of exports
    "Exports": {
      "balman:rds:SecurityGroupId": [ //Export's name and stack list that imports it
        "rbalman-rds-db"
      ],
      "balman:rds:Subnet": [
        "rbalman-rds-subnet"
      ]
    }
  },
  "rbalman-rds-db": {
    "Exports": {
      "rbalman:RDSEndpoint": null, //Import list is null as no stack has imported this export
      "rbalman:RDSEndpoint": [
        "rbalman-token-management-service"
      ]
    }
  }
}

Dependency Document Format

NOTE: CFN stacks with zero exports will not be listed in the dependency json file.

{
  "<stack-name1>": {
    "Exports": {
      "<first-export1>": null, //Import list is null as no stack has imported this export
      "<second-export2>": [
        "<first-importing-stack>",
        "<second-importing-stack>"
      ]
    }
  },
  "<stack-name2>": {
    "Exports": {
      "<first-export1>": null, //Import list is null as no stack has imported this export
      "<second-export2>": [
        "<first-importing-stack>",
        "<second-importing-stack>"
      ]
    }
  }
}

Installation Binary is available for Linux, Windows and Mac OS (amd64 and arm64). Download the binary for your respective platform from the releases page.

Using go cli

go install github.com/rbalman/cfn-compose@latest

Syntax

export AWS_PROFILE=dev AWS_REGION=us-east-1
cfnd dump --pattern "dev-iam"