terraform.tf.json

{
    "provider": {
        "google": {
            "account_file": "${var.GOOGLE_ACCOUNT_FILE}",
            "project": "${var.GOOGLE_PROJECT}",
            "region": "us-central1"
        }
    },

    "resource": {
        "google_compute_instance": {
            "etcd": {
                "count": "${var.ETCD_COUNT}",
                "depends_on": [
                    "template_file.etcd_cloud_config"
                ],
                "disk": {
                    "image": "coreos-beta-681-0-0-v20150527"
                },
                "machine_type": "n1-standard-1",
                "metadata": {
                    "cluster-size": "${var.ETCD_COUNT}",
                    "user-data": "${template_file.etcd_cloud_config.rendered}"
                },
                "name": "etcd-${count.index+1}-${var.ETCD_COUNT}",
                "network_interface": {
                    "access_config": {},
                    "network": "default"
                },
                "zone": "us-central1-a"
            }
        },
        "template_file": {
            "etcd_cloud_config": {
                "depends_on": [
                    "template_file.etcd_discovery_url"
                ],
                "filename": "etcd_cloud_config.yaml.tpl",
                "vars": {
                    "etcd_discovery_url": "${file(var.ETCD_DISCOVERY_URL_FILE)}",
                    "size": "${var.ETCD_COUNT}"
                }
            },
            "etcd_discovery_url": {
                "filename": "/dev/null",
                "provisioner": {
                    "local-exec": {
                        "command": "curl https://discovery.etcd.io/new?size=${var.ETCD_COUNT} > ${var.ETCD_DISCOVERY_URL_FILE}"
                    }
                },
                "vars": {
                    "size": "${var.ETCD_COUNT}"
                }
            }
        }
    },

    "variable": {
        "ETCD_COUNT": {
            "default": 5
        },
        "ETCD_DISCOVERY_URL_FILE": {
            "default": "etcd_discovery_url.txt"
        },
        "GOOGLE_ACCOUNT_FILE": {},
        "GOOGLE_PROJECT": {}
    }
}