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examples: add OpenStack configuration with networking
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‎examples/app-with-networking/README.md‎

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

‎examples/app-with-networking/main.tf‎

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

‎examples/app-with-networking/openrc.sample‎

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

‎examples/app-with-networking/outputs.tf‎

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

‎examples/app-with-networking/variables.tf‎

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

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