https://github.com/kolosovpetro/azureapplicationgatewayterraform

Example of azure application gateway using Terraform
https://github.com/kolosovpetro/azureapplicationgatewayterraform

app-gateway

Last synced: 8 months ago
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Example of azure application gateway using Terraform

• Host: GitHub
• URL: https://github.com/kolosovpetro/azureapplicationgatewayterraform
• Owner: kolosovpetro
• License: gpl-2.0
• Created: 2024-04-14T20:26:47.000Z (over 1 year ago)
• Default Branch: master
• Last Pushed: 2025-02-07T18:37:16.000Z (8 months ago)
• Last Synced: 2025-02-07T18:42:03.365Z (8 months ago)
• Topics: app-gateway
• Language: HCL
• Homepage:
• Size: 33.2 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Azure Application Gateway

Terraform repository for deploying Azure Application Gateway with backend pools of Azure App Services. Supports HTTPS

via TLS certificate. Automates DNS configuration using PowerShell scripts and Cloudflare.

## DEV

- https://agwy-dev.razumovsky.me

- http://agwy-dev.razumovsky.me

## QA

- https://agwy-qa.razumovsky.me

- http://agwy-qa.razumovsky.me

## Docs

- https://learn.microsoft.com/en-us/azure/application-gateway/overview

- https://quizlet.com/pl/975398961/azure-application-gateway-flash-cards/

## Azure Application Gateway components

- **Frontend IP** - Public or internal IP address that accepts incoming traffic to App Gateway

- **Frontend IP Configuration** - Binds Frontend Public IP address to Azure Application Gateway

- **Gateway IP Configuration** - Binds an application gateway within specific subnet ensuring internal communication

- **Frontend Port** - Defines a port that accepts incoming HTTP or HTTPS requests to application gateway

- **Backend Pool** - A list of IP addresses or FQDN where incoming HTTPS or HTTPS traffic is being forwarded

- **HTTP Listener** - A component that checks for incoming HTTP or HTTPS requests on a specified Frontend IP and Port.

  It determines how requests are processed based on its configuration, which includes Hostname, Protocol, and SSL

  settings

- **Backend HTTP Settings** - Defines how application gateway sends incoming traffic to backend servers, by setting up a

  Protocol, Backend port and Timeout interval

- **Routing Rules** - Defines how incoming requests are forwarded to backend targets. They link HTTP Listeners to

  Backend Pools by specifying the appropriate Backend HTTP settings

- **Health Probe** - Ensures that traffic is delivered only to healthy backend servers

## Azure Application Gateway architecture

![gateway](./images/app-gateway-architecture.jpg)

## Steps to configure Azure Application Gateway

- Deploy virtual network

- Deploy application gateway subnet

- Deploy application gateway public IP

- Associate gateway with subnet using `gateway_ip_configuration` block

- Define app gateway frontend ports (80, 443) by using `frontend_port` block

- Associate app gateway with public IP using `frontend_ip_configuration` block

- Define backend pools with app services FQDNs by using `backend_address_pool` block

- Define HTTP settings for routing rules by using `http_settings` block

- Add http and https listeners to the app gateway using `http_listener` block

- Define routing rules to handle requests based on headers CN

- Create a Cloudflare DNS record for the app gateway public IP and test connection