Terraform plan file to provision GCE hosts for OpenShift Origin install with openshift-ansible

main.tf

variable "master_instances" {
  description = "How many OpenShift master instances do you need?"
  default = 1
}

variable "node_instances" {
  description = "How many OpenShift node instances do you need?"
  default = 2
}

provider "google" {
  credentials = "${file("xxx.json")}"
  project     = "${var.project}"
  region      = "${var.region}"
}

resource "google_compute_instance" "oso_masters" {
    name = "oso-master-${format("%02d", count.index + 1)}"
    description = "OpenShift 3 master node ${format("%02d", count.index + 1)}"
    machine_type = "g1-small"
    zone = "${var.region}"
    tags = ["oso-master"]

    count = "${var.master_instances}"

    disk {
        image = "centos-7-v20161212"
    }

    network_interface {
        network = "default"
        access_config {
            // Ephemeral IP
        }
    }

    scheduling {
      preemptible = true
    }
}

data "template_file" "master_host" {
    template = "${file("templates/master_host.tpl")}"

    count = "${var.master_instances}"

    vars {
      master_external_ip = "${element(google_compute_instance.oso_masters.*.network_interface.0.access_config.0.assigned_nat_ip, count.index)}"
    }
}

resource "google_compute_instance" "oso_nodes" {
    name = "oso-node-${format("%02d", count.index + 1)}"
    description = "OpenShift 3 node ${format("%02d", count.index + 1)}"
    machine_type = "g1-small"
    zone = "${var.region}"
    tags = ["oso-node"]

    count = "${var.node_instances}"

    disk {
        image = "centos-7-v20161212"
    }

    network_interface {
        network = "default"
        access_config {
            // Ephemeral IP
        }
    }

    scheduling {
      preemptible = true
    }
}

data "template_file" "node_host" {
    template = "${file("templates/node_host.tpl")}"

    count = "${var.node_instances}"

    vars {
      node_external_ip = "${element(google_compute_instance.oso_nodes.*.network_interface.0.access_config.0.assigned_nat_ip, count.index)}"
    }
}

data "template_file" "oso_inventory" {
    template = "${file("templates/oso.tpl")}"

    vars {
      masters = "${join("", data.template_file.master_host.*.rendered)}"
      master_count = "${var.master_instances}"
    }

    vars {
      compute_nodes = "${join("", data.template_file.node_host.*.rendered)}"
      compute_node_count = "${var.node_instances}"
    }
}

output "rendered" {
  value = "${data.template_file.oso_inventory.rendered}"
}

resource "null_resource" "inventory" {
    provisioner "local-exec" {
        command = "echo '${data.template_file.oso_inventory.rendered}' > ../gce/OSEv3"
    }
}