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Diff for: ‎examples/.gitignore

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**/.terraform
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**/terraform.tfstate*

Diff for: ‎examples/simple/README.md

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# Internal Load Balancer Example
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This example creates 3 instance groups. The first group is in us-central1-b and uses the internal load balancer to proxy access to services running in instance groups 2 and 3 which exist in us-central1-c and us-central1-f respectively. A regional TCP load balancer is also used to forward external traffic to the instances in group 1.
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**Figure 1.** *diagram of Google Cloud resources*
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![architecture diagram](./diagram.png)
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## Set up the environment
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```
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gcloud auth application-default login
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export GOOGLE_PROJECT=$(gcloud config get-value project)
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```
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## Run Terraform
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```
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terraform init
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terraform plan
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terraform apply
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```
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Open URL of load balancer in browser:
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```
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EXTERNAL_IP=$(terraform output -module gce-lb-fr | grep external_ip | cut -d = -f2 | xargs echo -n)
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open http://${EXTERNAL_IP}
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```
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You should see the instance details from `group2` proxied through `group1` and the internal load balancer.

Diff for: ‎examples/simple/diagram.png

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Diff for: ‎examples/simple/gceme.sh.tpl

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#!/bin/bash -xe
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apt-get update
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apt-get install -y apache2 php5
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cat > /var/www/html/index.php <<'EOF'
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<?php
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function metadata_value($value) {
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$opts = [
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"http" => [
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"method" => "GET",
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"header" => "Metadata-Flavor: Google"
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]
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];
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$context = stream_context_create($opts);
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$content = file_get_contents("http://metadata/computeMetadata/v1/$value", false, $context);
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return $content;
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}
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?>
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<!doctype html>
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<html>
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<head>
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<!-- Compiled and minified CSS -->
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.0/css/materialize.min.css">
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<!-- Compiled and minified JavaScript -->
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<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.97.0/js/materialize.min.js"></script>
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<title>Frontend Web Server</title>
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</head>
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<body>
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<div class="container">
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<div class="row">
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<div class="col s2">&nbsp;</div>
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<div class="col s8">
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<div class="card blue">
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<div class="card-content white-text">
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<div class="card-title">Backend that serviced this request</div>
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</div>
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<div class="card-content white">
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<table class="bordered">
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<tbody>
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<tr>
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<td>Name</td>
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<td><?php printf(metadata_value("instance/name")) ?></td>
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</tr>
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<tr>
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<td>ID</td>
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<td><?php printf(metadata_value("instance/id")) ?></td>
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</tr>
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<tr>
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<td>Hostname</td>
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<td><?php printf(metadata_value("instance/hostname")) ?></td>
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</tr>
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<tr>
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<td>Zone</td>
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<td><?php printf(metadata_value("instance/zone")) ?></td>
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</tr>
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<tr>
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<td>Machine Type</td>
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<td><?php printf(metadata_value("instance/machine-type")) ?></td>
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</tr>
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<tr>
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<td>Project</td>
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<td><?php printf(metadata_value("project/project-id")) ?></td>
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</tr>
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<tr>
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<td>Internal IP</td>
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<td><?php printf(metadata_value("instance/network-interfaces/0/ip")) ?></td>
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</tr>
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<tr>
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<td>External IP</td>
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<td><?php printf(metadata_value("instance/network-interfaces/0/access-configs/0/external-ip")) ?></td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div class="card blue">
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<div class="card-content white-text">
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<div class="card-title">Proxy that handled this request</div>
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</div>
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<div class="card-content white">
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<table class="bordered">
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<tbody>
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<tr>
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<td>Address</td>
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<td><?php printf($_SERVER["HTTP_HOST"]); ?></td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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</div>
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<div class="col s2">&nbsp;</div>
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</div>
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</div>
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</html>
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EOF
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sudo mv /var/www/html/index.html /var/www/html/index.html.old
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[[ -n "${PROXY_PATH}" ]] && mkdir -p /var/www/html/${PROXY_PATH} && cp /var/www/html/index.php /var/www/html/${PROXY_PATH}/index.php
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systemctl enable apache2
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systemctl restart apache2

Diff for: ‎examples/simple/main.tf

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/*
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* Copyright 2017 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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variable region {
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default = "us-central1"
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}
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variable network {
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default = "default"
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}
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variable zone {
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default = "us-central1-b"
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}
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provider google {
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region = "${var.region}"
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}
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module "gce-lb-fr" {
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source = "github.com/GoogleCloudPlatform/terraform-google-lb"
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region = "${var.region}"
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network = "${var.network}"
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name = "group1-lb"
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service_port = "${module.mig1.service_port}"
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target_tags = ["${module.mig1.target_tags}"]
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}
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module "gce-ilb" {
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source = "../../"
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region = "${var.region}"
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name = "group-ilb"
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ports = ["${module.mig2.service_port}"]
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health_port = "${module.mig2.service_port}"
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source_tags = ["${module.mig1.target_tags}"]
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target_tags = ["${module.mig2.target_tags}", "${module.mig3.target_tags}"]
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backends = [
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{
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group = "${module.mig2.instance_group}"
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},
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{
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group = "${module.mig3.instance_group}"
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},
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]
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}

Diff for: ‎examples/simple/mig.tf

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/*
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* Copyright 2017 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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data "template_file" "group1-startup-script" {
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template = "${file("${format("%s/nginx_upstream.sh.tpl", path.module)}")}"
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vars {
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UPSTREAM = "${module.gce-ilb.ip_address}"
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}
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}
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data "template_file" "group2-startup-script" {
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template = "${file("${format("%s/gceme.sh.tpl", path.module)}")}"
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vars {
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PROXY_PATH = ""
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}
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}
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data "template_file" "group3-startup-script" {
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template = "${file("${format("%s/gceme.sh.tpl", path.module)}")}"
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vars {
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PROXY_PATH = ""
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}
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}
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module "mig1" {
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source = "github.com/GoogleCloudPlatform/terraform-google-managed-instance-group"
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region = "${var.region}"
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zone = "${var.zone}"
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name = "group1"
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size = 2
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target_tags = ["allow-group1"]
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target_pools = ["${module.gce-lb-fr.target_pool}"]
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service_port = 80
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service_port_name = "http"
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startup_script = "${data.template_file.group1-startup-script.rendered}"
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}
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module "mig2" {
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source = "github.com/GoogleCloudPlatform/terraform-google-managed-instance-group"
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region = "${var.region}"
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zone = "us-central1-c"
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name = "group2"
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size = 2
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target_tags = ["allow-group2"]
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service_port = 80
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service_port_name = "http"
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startup_script = "${data.template_file.group2-startup-script.rendered}"
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}
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module "mig3" {
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source = "github.com/GoogleCloudPlatform/terraform-google-managed-instance-group"
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region = "${var.region}"
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zone = "us-central1-f"
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name = "group3"
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size = 2
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target_tags = ["allow-group3"]
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service_port = 80
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service_port_name = "http"
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startup_script = "${data.template_file.group3-startup-script.rendered}"
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}

Diff for: ‎examples/simple/nginx_upstream.sh.tpl

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#!/bin/bash -xe
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apt-get update
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apt-get install -y nginx
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cat - > /etc/nginx/sites-available/upstream <<EOF
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server {
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listen 80;
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location / {
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proxy_pass http://${UPSTREAM};
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}
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}
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EOF
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unlink /etc/nginx/sites-enabled/default
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ln -sf /etc/nginx/sites-available/upstream /etc/nginx/sites-enabled/upstream
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systemctl enable nginx
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systemctl reload nginx

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