Null Resource

The null_data_source data source implements the standard data source lifecycle but does not interact with any external APIs.

Example Usage

The primary use-case for the null data source is to gather together collections of intermediate values to re-use elsewhere in configuration:

data "null_data_source" "values" {
  inputs = {
    all_server_ids = "${concat(aws_instance.green.*.id, aws_instance.blue.*.id)}"
    all_server_ips = "${concat(aws_instance.green.*.private_ip, aws_instance.blue.*.private_ip)}"
  }
}

resource "aws_elb" "main" {
  # ...

  instances = "${data.null_data_source.values.outputs["all_server_ids"]}"
}

output "all_server_ids" {
  value = "${data.null_data_source.values.outputs["all_server_ids"]}"
}

output "all_server_ips" {
  value = "${data.null_data_source.values.outputs["all_server_ips"]}"
}

# ... (other uses of the values) ...

Argument Reference

The following arguments are supported:

• inputs - (Optional) A map of arbitrary strings that is copied into the outputs attribute, and accessible directly for interpolation.

• has_computed_default - (Optional) If set, its literal value will be stored and returned. If not, its value defaults to "default". This argument exists primarily for testing and has little practical use.

Attributes Reference

The following attributes are exported:

• outputs - After the data source is "read", a copy of the inputs map.

• random - A random value. This is primarily for testing and has little practical use; prefer the random provider for more practical random number use-cases.