Add example configurations for Terraform

Add Terraform-formatted configuration. Add JSON-formatted
configuration. Add README with instructions on using these
configurations.

terraform/README.md

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+# Using Terraform with OpenStack
+
+These files were created to allow users to use an example Terraform ([http://terraform.io](http://terraform.io)) configuration with OpenStack. These files require a working Terraform installation and a working OpenStack environment.
+
+## Contents
+
+* **README.md**: This file you're currently reading.
+
+* **tf-example**: This directory contains an example Terraform configuration written in Terraform format.
+
+* **tf-json-example**: This directory contains an example Terraform configuration written in JSON format.
+
+## Instructions
+
+These instructions assume you've already installed Terraform. These instructions also assume that you have a working OpenStack environment against which to run the Terraform configurations.
+
+1. Edit `provider.tf` or `provider.tf.json` with the correct username, tenant, password, and authentication URL for your OpenStack environment.
+2. Edit `vars.tf` or `vars.tf.json` to provide the correct values for image name, flavor, external network (for the logical router), SSH key pair, and floating IP pool.
+3. From either the `tf-example` or `tf-json-example` directory, run `terraform plan` to see what changes will be made.
+4. If you are happy with the output of #3, run `terraform apply`.
+
+Enjoy!
+
+## License
+
+This material is licensed under the MIT License.

terraform/tf-example/main.tf

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+resource "openstack_networking_network_v2" "tf-net" {
+	name = "tf-net"
+	admin_state_up = "true"
+}
+
+resource "openstack_networking_subnet_v2" "tf-subnet" {
+	name = "tf-subnet"
+	network_id = "${openstack_networking_network_v2.tf-net.id}"
+	cidr = "192.168.200.0/24"
+	ip_version = 4
+	dns_nameservers = ["8.8.8.8","8.8.4.4"]
+}
+
+resource "openstack_networking_router_v2" "tf-router" {
+	name = "tf-router"
+	admin_state_up = "true"
+	external_gateway = "${var.external_gateway}"
+}
+
+resource "openstack_networking_router_interface_v2" "tf-router-interface" {
+	router_id = "${openstack_networking_router_v2.tf-router.id}"
+	subnet_id = "${openstack_networking_subnet_v2.tf-subnet.id}"
+}
+
+resource "openstack_compute_floatingip_v2" "tf-fip" {
+	pool = "${var.pool}"
+	depends_on = ["openstack_networking_router_interface_v2.tf-router-interface"]
+}
+
+resource "openstack_compute_instance_v2" "tf-instance" {
+	name = "tf-instance"
+	image_name = "${var.image}"
+	flavor_name = "${var.flavor}"
+	key_pair = "${var.key_pair}"
+	security_groups = ["default"]
+	floating_ip = "${openstack_compute_floatingip_v2.tf-fip.address}"
+	network {
+		uuid = "${openstack_networking_network_v2.tf-net.id}"
+	}
+}

terraform/tf-example/output.tf

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+output "address" {
+	value = "${openstack_compute_floatingip_v2.tf-fip.address}"
+}

terraform/tf-example/provider.tf

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+provider "openstack" {
+	user_name = "demo"
+	tenant_name = "demo"
+	password = "password"
+	auth_url = "http://openstack.domain.net:5000/v2.0"
+}

terraform/tf-example/vars.tf

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+variable "image" {
+	default = "<INSERT YOUR VALUE HERE>"
+}
+
+variable "flavor" {
+	default = "m1.small"
+}
+
+variable "external_gateway" {
+	default = "<INSERT YOUR VALUE HERE>"
+}
+
+variable "key_pair" {
+	default = "<INSERT YOUR VALUE HERE>"
+}
+
+variable "pool" {
+	default = "<INSERT YOUR VALUE HERE>"
+}

terraform/tf-json-example/main.tf.json

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+{
+	"resource": {
+		"openstack_networking_network_v2": {
+			"tf-net": {
+				"name": "tf-net",
+				"admin_state_up": "true"
+			}
+		}
+	},
+
+	"resource": {
+		"openstack_networking_subnet_v2": {
+			"tf-subnet": {
+				"name": "tf-subnet",
+				"network_id": "${openstack_networking_network_v2.tf-net.id}",
+				"cidr": "192.168.200.0/24",
+				"ip_version": 4,
+				"dns_nameservers": [
+					"8.8.8.8",
+					"8.8.4.4"
+				]
+			}
+		}
+	},
+
+	"resource": {
+		"openstack_networking_router_v2": {
+			"tf-router": {
+				"name": "tf-router",
+				"admin_state_up": "true",
+				"external_gateway": "${var.external_gateway}"
+			}
+		}
+	},
+
+	"resource": {
+		"openstack_networking_router_interface_v2": {
+			"tf-router-iface": {
+				"router_id": "${openstack_networking_router_v2.tf-router.id}",
+				"subnet_id": "${openstack_networking_subnet_v2.tf-subnet.id}"
+			}
+		}
+	},
+
+	"resource": {
+		"openstack_compute_floatingip_v2": {
+			"tf-fip": {
+				"pool": "${var.pool}",
+				"depends_on": [
+					"openstack_networking_router_interface_v2.tf-router-iface"
+				]
+			}
+		}
+	},
+
+	"resource": {
+		"openstack_compute_instance_v2": {
+			"tf-instance": {
+				"name": "tf-instance",
+				"image_name": "${var.image}",
+				"flavor_name": "${var.flavor}",
+				"key_pair": "${var.key_pair}",
+				"floating_ip": "${openstack_compute_floatingip_v2.tf-fip.address}",
+				"security_groups": ["default"],
+				"network": {
+					"uuid": "${openstack_networking_network_v2.tf-net.id}"
+				}
+			}
+		}
+	}
+}

terraform/tf-json-example/output.tf.json

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+{
+	"output": {
+		"address": {
+			"value": "${openstack_compute_floatingip_v2.tf-fip.address}"
+		}
+	}
+}

terraform/tf-json-example/provider.tf.json

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+{
+	"provider": {
+		"openstack": {
+			"user_name": "demo",
+			"tenant_name": "demo",
+			"password": "password",
+			"auth_url": "http://openstack.domain.net:5000/v2.0"
+		}
+	}
+}

terraform/tf-json-example/vars.tf.json

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+{
+	"variable": {
+		"image": {
+			"default": "INSERT YOUR VALUE HERE"
+		}
+	},
+
+	"variable": {
+		"flavor": {
+			"default": "m1.small"
+		}
+	},
+
+	"variable": {
+		"external_gateway": {
+			"default": "INSERT YOUR VALUE HERE"
+		}
+	},
+
+	"variable": {
+		"key_pair": {
+			"default": "INSERT YOUR VALUE HERE"
+		}
+	},
+
+	"variable": {
+		"pool": {
+			"default": "INSERT YOUR VALUE HERE"
+		}
+	}
+}