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‎3_networking/application-gateway/README.md‎

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# Terraform Template - Azure Application Gateway
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Costa Rica
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[![GitHub](https://img.shields.io/badge/--181717?logo=github&logoColor=ffffff)](https://github.com/)
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[brown9804](https://github.com/brown9804)
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Last updated: 2025-06-12
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----------
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> This template contains Terraform configurations to create and manage an Azure Application Gateway with its associated components including public IP, backend pool, and request routing rules.
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> [!NOTE]
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> The Application Gateway configuration uses Standard_v2 SKU, providing enhanced features like autoscaling, zone redundancy, and Web Application Firewall.
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<p align="center">
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<img width="550" alt="image" src="https://github.com/user-attachments/assets/d2f8a37d-f1bc-4da5-9fff-eb8e89905315">
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</p>
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## File Descriptions
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- **main.tf**: Contains the main configuration for creating the Azure Application Gateway and its associated resources.
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- **variables.tf**: Defines the input variables used in the Terraform configuration.
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- **provider.tf**: Configures the Azure provider to interact with Azure resources.
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- **terraform.tfvars**: Provides default values for the variables defined in `variables.tf`.
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- **outputs.tf**: Defines the outputs such as Application Gateway ID and public IP address.
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## Variables
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> Below is a list of variables used in this template, their expected values, types, and examples:
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| Variable Name | Description | Type | Example Value |
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|--------------|-------------|------|---------------|
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| `subscription_id` | The Azure subscription ID | string | `"12345678-abcd-efgh-ijkl-9876543210"` |
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| `resource_group_name` | The name of the resource group | string | `"appgw-resource-group"` |
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| `location` | The Azure region to deploy resources | string | `"eastus"` |
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| `public_ip_name` | The name of the public IP address | string | `"appgw-public-ip"` |
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| `app_gateway_name` | The name of the Application Gateway | string | `"my-app-gateway"` |
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| `vnet_name` | The name of the virtual network | string | `"appgw-vnet"` |
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| `vnet_address_space` | The address space of the virtual network | list(string) | `["10.0.0.0/16"]` |
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| `subnet_name` | The name of the subnet for the Application Gateway | string | `"appgw-subnet"` |
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| `subnet_address_prefixes` | The address prefixes for the subnet | list(string) | `["10.0.1.0/24"]` |
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## Usage
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1. Clone the repository and navigate to the application gateway directory.
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2. Update the `terraform.tfvars` file with your values.
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3. Initialize and apply the Terraform configuration:
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```bash
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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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## Outputs
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| Output Name | Description |
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|-------------|-------------|
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| `application_gateway_id` | The ID of the Application Gateway |
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| `public_ip_address` | The frontend public IP address of the Application Gateway |
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| `virtual_network_name` | The name of the virtual network |
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| `subnet_name` | The name of the subnet used by the Application Gateway |
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<div align="center">
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<h3 style="color: #4CAF50;">Total Visitors</h3>
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<img src="https://profile-counter.glitch.me/brown9804/count.svg" alt="Visitor Count" style="border: 2px solid #4CAF50; border-radius: 5px; padding: 5px;"/>
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</div>

‎3_networking/application-gateway/main.tf‎

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# Azure Application Gateway minimal configuration
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resource "azurerm_resource_group" "agw" {
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name = var.resource_group_name
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location = var.location
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}
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resource "azurerm_virtual_network" "vnet" {
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name = var.vnet_name
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location = azurerm_resource_group.agw.location
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resource_group_name = azurerm_resource_group.agw.name
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address_space = var.vnet_address_space
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}
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resource "azurerm_subnet" "subnet" {
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name = var.subnet_name
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resource_group_name = azurerm_resource_group.agw.name
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virtual_network_name = azurerm_virtual_network.vnet.name
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address_prefixes = var.subnet_address_prefixes
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}
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resource "azurerm_public_ip" "agw" {
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name = var.public_ip_name
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location = azurerm_resource_group.agw.location
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resource_group_name = azurerm_resource_group.agw.name
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allocation_method = "Static"
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sku = "Standard"
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}
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resource "azurerm_application_gateway" "agw" {
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name = var.app_gateway_name
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location = azurerm_resource_group.agw.location
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resource_group_name = azurerm_resource_group.agw.name
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sku {
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name = "Standard_v2"
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tier = "Standard_v2"
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capacity = 2
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}
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gateway_ip_configuration {
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name = "appGatewayIpConfig"
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subnet_id = azurerm_subnet.subnet.id
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}
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frontend_port {
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name = "frontendPort"
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port = 80
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}
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frontend_ip_configuration {
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name = "frontendIpConfig"
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public_ip_address_id = azurerm_public_ip.agw.id
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}
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backend_address_pool {
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name = "backendPool"
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}
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backend_http_settings {
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name = "httpSettings"
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cookie_based_affinity = "Disabled"
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port = 80
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protocol = "Http"
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}
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http_listener {
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name = "httpListener"
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frontend_ip_configuration_name = "frontendIpConfig"
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frontend_port_name = "frontendPort"
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protocol = "Http"
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}
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request_routing_rule {
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name = "rule1"
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rule_type = "Basic"
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http_listener_name = "httpListener"
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backend_address_pool_name = "backendPool"
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backend_http_settings_name = "httpSettings"
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priority = 320 # Add a priority value (1-20000)
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}
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}

‎3_networking/application-gateway/outputs.tf‎

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# outputs.tf
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# This file defines the outputs of the Terraform configuration.
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output "resource_group_name" {
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description = "The name of the resource group"
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value = azurerm_resource_group.agw.name
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}
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output "application_gateway_id" {
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description = "The ID of the Application Gateway"
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value = azurerm_application_gateway.agw.id
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}
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output "application_gateway_frontend_ip" {
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description = "The frontend public IP address of the Application Gateway"
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value = azurerm_public_ip.agw.ip_address
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}
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output "virtual_network_name" {
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description = "The name of the virtual network"
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value = azurerm_virtual_network.vnet.name
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}
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output "subnet_name" {
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description = "The name of the subnet used by the Application Gateway"
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value = azurerm_subnet.subnet.name
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}

‎3_networking/application-gateway/provider.tf‎

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# provider.tf
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# This file configures the Azure provider to interact with Azure resources.
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# It specifies the required provider and its version, along with provider-specific configurations.
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terraform {
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required_version = ">= 1.8, < 2.0"
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# Specify the required provider and its version
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required_providers {
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azurerm = {
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source = "hashicorp/azurerm" # Source of the AzureRM provider
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version = "~> 4.16.0" # Version of the AzureRM provider
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}
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}
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}
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provider "azurerm" {
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features {} # Enable all features for the AzureRM provider
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subscription_id = var.subscription_id # Use the subscription ID variable
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}

‎3_networking/application-gateway/terraform.tfvars‎

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# terraform.tfvars
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# This file provides default values for the variables defined in variables.tf.
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# These values can be overridden by specifying different values during Terraform execution.
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# Azure Subscription
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subscription_id = "" # your-subscription-id
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# Resource Group
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resource_group_name = "RG-appgateway-test" # your-resource-group-name
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location = "eastus"
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# Application Gateway Configuration
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public_ip_name = "demo-public-ip"
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app_gateway_name = "demo-app-gateway"
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vnet_name = "demo-vnet"
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vnet_address_space = ["10.0.0.0/16"] # your-vnet-address-space
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subnet_name = "demo-subnet"
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subnet_address_prefixes = ["10.0.1.0/24"] # your-subnet-address-prefix

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