{
  "Type" : "AWS::OpsWorks::Stack",
  "Properties" : {
    "Name" : {"Ref":"OpsWorksStackName"},
    "ServiceRoleArn" : { "Fn::Join": ["", ["arn:aws:iam::", {"Ref":"AWS::AccountId"}, ":role/aws-opsworks-service-role"]] },
    "DefaultInstanceProfileArn" : { "Fn::Join": ["", ["arn:aws:iam::", {"Ref":"AWS::AccountId"}, ":instance-profile/aws-opsworks-ec2-role"]] },
    "DefaultSshKeyName" : {"Ref":"KeyName"}
  }
}