Merge pull request #5917 from mcalthrop/enhancement/google-two-tier-example

Address #5912: google-two-tier example incomplete

examples/google-two-tier/README.md

@@ -11,6 +11,17 @@ getting your application onto the servers. However, you could do so either via
 management tool, or by pre-baking configured images with
 [Packer](https://packer.io/docs/builders/googlecompute.html).
 
+You will need to generate SSH keys as follows:
+
+```sh
+$ ssh-keygen -f ~/.ssh/gcloud_id_rsa
+# press <Enter> when asked (twice) for a pass-phrase
+```
+
+Then [download your credentials from Google Cloud Console](https://www.terraform.io/docs/providers/google/#credentials); suggested path for downloaded file is `~/.gcloud/Terraform.json`.
+
+Optionally update `variables.tf` to specify a default value for the `project_name` variable, and check other variables.
+
 After you run `terraform apply` on this configuration, it will
 automatically output the public IP address of the load balancer.
 After your instance registers, the LB should respond with a simple header:
@@ -33,7 +44,7 @@ terraform apply \
 	-var="region=us-central1" \
 	-var="region_zone=us-central1-f" \
 	-var="project_name=my-project-id-123" \
-	-var="account_file_path=~/.gcloud/Terraform.json" \
+	-var="credentials_file_path=~/.gcloud/Terraform.json" \
 	-var="public_key_path=~/.ssh/gcloud_id_rsa.pub" \
 	-var="private_key_path=~/.ssh/gcloud_id_rsa"
 ```

examples/google-two-tier/main.tf

@@ -3,7 +3,7 @@
 provider "google" {
   region = "${var.region}"
   project = "${var.project_name}"
-  account_file = "${file(var.account_file_path)}"
+  credentials = "${file("${var.credentials_file_path}")}"
 }
 
 resource "google_compute_http_health_check" "default" {
@@ -31,31 +31,47 @@ resource "google_compute_instance" "www" {
   count = 3
 
   name = "tf-www-${count.index}"
-  machine_type = "n1-standard-1"
+  machine_type = "f1-micro"
   zone = "${var.region_zone}"
   tags = ["www-node"]
 
   disk {
-    image = "ubuntu-os-cloud/ubuntu-1204-precise-v20150625"
+    image = "ubuntu-os-cloud/ubuntu-1404-trusty-v20160314"
   }
 
   network_interface {
     network = "default"
     access_config {
-        # Ephemeral
+      # Ephemeral
     }
   }
 
   metadata {
-    sshKeys = "ubuntu:${file("~/.ssh/gcloud_id_rsa.pub")}"
+    ssh-keys = "root:${file("${var.public_key_path}")}"
-    startup-script = <<SCRIPT
+  }
-apt-get -y update
+
-apt-get -y install nginx
+  provisioner "file" {
-HOSTNAME=$(hostname | tr -d "\n")
+    source = "${var.install_script_src_path}"
-IP=$(curl -s -H "Metadata-Flavor:Google" http://metadata/computeMetadata/v1/instance/network-interfaces/0/ip)
+    destination = "${var.install_script_dest_path}"
-echo "Welcome to ${count.index} - $HOSTNAME ($IP)" > /usr/share/nginx/www/index.html
+    connection {
-service nginx start
+      type = "ssh"
-SCRIPT
+      user = "root"
+      private_key = "${file("${var.private_key_path}")}"
+      agent = false
+    }
+  }
+
+  provisioner "remote-exec" {
+    connection {
+      type = "ssh"
+      user = "root"
+      private_key = "${file("${var.private_key_path}")}"
+      agent = false
+    }
+    inline = [
+      "chmod +x ${var.install_script_dest_path}",
+      "${var.install_script_dest_path} ${count.index}"
+    ]
   }
 
   service_account {

examples/google-two-tier/output.tf

@@ -3,5 +3,5 @@ output "pool_public_ip" {
 }
 
 output "instance_ips" {
-  value = "${join(" ", google_compute_instance.www.*.network_interface.0.access_config.0.nat_ip)}"
+  value = "${join(" ", google_compute_instance.www.*.network_interface.0.access_config.0.assigned_nat_ip)}"
 }

examples/google-two-tier/scripts/install.sh

@@ -0,0 +1,8 @@
+#!/bin/bash -xe
+
+RESOURCE_INDEX=$1
+apt-get -y update
+apt-get -y install nginx
+IP=$(curl -s -H "Metadata-Flavor:Google" http://metadata/computeMetadata/v1/instance/network-interfaces/0/ip)
+echo "Welcome to Resource ${RESOURCE_INDEX} - ${HOSTNAME} (${IP})" > /usr/share/nginx/html/index.html
+service nginx start

examples/google-two-tier/variables.tf

@@ -10,6 +10,27 @@ variable "project_name" {
   description = "The ID of the Google Cloud project"
 }
 
-variable "account_file_path" {
+variable "credentials_file_path" {
   description = "Path to the JSON file used to describe your account credentials"
+  default = "~/.gcloud/Terraform.json"
+}
+
+variable "public_key_path" {
+  description = "Path to file containing public key"
+  default = "~/.ssh/gcloud_id_rsa.pub"
+}
+
+variable "private_key_path" {
+  description = "Path to file containing private key"
+  default = "~/.ssh/gcloud_id_rsa"
+}
+
+variable "install_script_src_path" {
+  description = "Path to install script within this repository"
+  default = "scripts/install.sh"
+}
+
+variable "install_script_dest_path" {
+  description = "Path to put the install script on each destination resource"
+  default = "/tmp/install.sh"
 }