{    
     "schemaVersion": "1.0",
     "description": "Sample configuration to join an instance to a domain",
     "runtimeConfig": {
        "aws:domainJoin": {
          "properties": {
            "directoryId": "<directory id>",
            "directoryName": "<domain name>",
            "dnsIpAddresses": [
               "<domain controller IP address>"
         ]
       }
    }
  }
}