examples: add OpenStack configuration with networking

examples/openstack-with-networking/README.md

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+# Basic OpenStack architecture with networking
+
+This provides a template for running a simple architecture on an OpenStack
+cloud.
+
+To simplify the example, this intentionally ignores deploying and
+getting your application onto the servers. However, you could do so either via
+[provisioners](https://www.terraform.io/docs/provisioners/) and a configuration
+management tool, or by pre-baking configured images with
+[Packer](http://www.packer.io).
+
+After you run `terraform apply` on this configuration, it will output the
+floating IP address assigned to the instance. After your instance started,
+this should respond with the default nginx web page.
+
+First set the required environment variables for the OpenStack provider by
+sourcing the [credentials file](http://docs.openstack.org/cli-reference/content/cli_openrc.html).
+
+```
+source openrc
+```
+
+Afterwards run with a command like this:
+
+```
+terraform apply \
+  -var 'external_gateway=c1901f39-f76e-498a-9547-c29ba45f64df' \
+  -var 'pool=public'
+```
+
+To get a list of usable floating IP pools run this command:
+
+```
+$ nova floating-ip-pool-list
++--------+
+| name   |
++--------+
+| public |
++--------+
+```
+
+To get the UUID of the external gateway run this command:
+
+```
+$ neutron net-show FLOATING_IP_POOL
++---------------------------+--------------------------------------+
+| Field                     | Value                                |
++---------------------------+--------------------------------------+
+| admin_state_up            | True                                 |
+| id                        | c1901f39-f76e-498a-9547-c29ba45f64df |
+| mtu                       | 0                                    |
+| name                      | public                               |
+| port_security_enabled     | True                                 |
+| provider:network_type     | vxlan                                |
+| provider:physical_network |                                      |
+| provider:segmentation_id  | 1092                                 |
+| router:external           | True                                 |
+| shared                    | False                                |
+| status                    | ACTIVE                               |
+| subnets                   | 42b672ae-8d51-4a18-a028-ddae7859ec4c |
+| tenant_id                 | 1bde0a49d2ff44ffb44e6339a8cefe3a     |
++---------------------------+--------------------------------------+
+```

examples/openstack-with-networking/main.tf

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+resource "openstack_compute_keypair_v2" "terraform" {
+  name = "terraform"
+  public_key = "${file("${var.ssh_key_file}.pub")}"
+}
+
+resource "openstack_networking_network_v2" "terraform" {
+  name = "terraform"
+  admin_state_up = "true"
+}
+
+resource "openstack_networking_subnet_v2" "terraform" {
+  name = "terraform"
+  network_id = "${openstack_networking_network_v2.terraform.id}"
+  cidr = "10.0.0.0/24"
+  ip_version = 4
+  dns_nameservers = ["8.8.8.8","8.8.4.4"]
+}
+
+resource "openstack_networking_router_v2" "terraform" {
+  name = "terraform"
+  admin_state_up = "true"
+  external_gateway = "${var.external_gateway}"
+}
+
+resource "openstack_networking_router_interface_v2" "terraform" {
+  router_id = "${openstack_networking_router_v2.terraform.id}"
+  subnet_id = "${openstack_networking_subnet_v2.terraform.id}"
+}
+
+resource "openstack_compute_secgroup_v2" "terraform" {
+  name = "terraform"
+  description = "Security group for the Terraform example instances"
+  rule {
+    from_port = 22
+    to_port = 22
+    ip_protocol = "tcp"
+    cidr = "0.0.0.0/0"
+  }
+  rule {
+    from_port = 80
+    to_port = 80
+    ip_protocol = "tcp"
+    cidr = "0.0.0.0/0"
+  }
+  rule {
+    from_port = -1
+    to_port = -1
+    ip_protocol = "icmp"
+    cidr = "0.0.0.0/0"
+  }
+}
+
+resource "openstack_compute_floatingip_v2" "terraform" {
+  pool = "${var.pool}"
+  depends_on = ["openstack_networking_router_interface_v2.terraform"]
+}
+
+resource "openstack_compute_instance_v2" "terraform" {
+  name = "terraform"
+  image_name = "${var.image}"
+  flavor_name = "${var.flavor}"
+  key_pair = "${openstack_compute_keypair_v2.terraform.name}"
+  security_groups = [ "${openstack_compute_secgroup_v2.terraform.name}" ]
+  floating_ip = "${openstack_compute_floatingip_v2.terraform.address}"
+  network {
+    uuid = "${openstack_networking_network_v2.terraform.id}"
+  }
+  provisioner "remote-exec" {
+    connection {
+      user = "${var.ssh_user_name}"
+      key_file = "${var.ssh_key_file}"
+    }
+    inline = [
+        "sudo apt-get -y update",
+        "sudo apt-get -y install nginx",
+        "sudo service nginx start"
+    ]
+  }
+}

examples/openstack-with-networking/openrc.sample

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+#!/usr/bin/env bash
+
+export OS_AUTH_URL=http://KEYSTONE.ENDPOINT.URL:5000/v2.0
+export OS_TENANT_NAME=YOUR_TENANT_NAME
+export OS_USERNAME=YOUR_USERNAME
+export OS_PASSWORD=YOUR_PASSWORD
+export OS_REGION_NAME=YOUR_REGION_NAME

examples/openstack-with-networking/outputs.tf

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+output "address" {
+    value = "${openstack_compute_floatingip_v2.terraform.address}"
+}

examples/openstack-with-networking/variables.tf

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+variable "image" {
+    default = "Ubuntu 14.04"
+}
+
+variable "flavor" {
+    default = "m1.small"
+}
+
+variable "ssh_key_file" {
+    default = "~/.ssh/id_rsa.terraform"
+}
+
+variable "ssh_user_name" {
+    default = "ubuntu"
+}
+
+variable "external_gateway" {
+}
+
+variable "pool" {
+    default = "public"
+}