AZ-104 Certification Notes

Chapter 11.3 - Application Gateway CheatSheet

Azure Application Gateway CheatSheet

Azure Application Gateway is application-level routing and load balancing service. Application Gateway operates on OSI Layer 7 also known as the Application Layer.

• Azure Web Application Firewall (WAF) policies can be attached to an Application Gateway to provide additional security An Application Gateway is composed of Frontends, Routing Rules, and Backends:
• Frontends you choose an address type
  • Private IP will create an Internal Load Balancer
  • Public IP will create a Public/External Load Balancer
• Backends you create Backend Pools
  • Backend pools
    • A backend pool is a collection of resources to which your application gateway can send traffic
    • A backend pool can contain, VMs, VM scale sets, IP addresses, domain names, App Services
• Routing Rules are composed of Listeners, Backend targets, HTTP Settings
  • Listeners "listens" on a specified port and IP address for traffic that uses a specified protocol
    • If the listener criteria are met, the application gateway will apply this routing rule
    • There are 2 types of listeners:
      • Basic - Forward all requests for any domain to backend pools
      • Multi-site - Forward requests to different backend pools based on host header and host name
    • Requests are matched according to the order of the rules and the type of listeners
      • Add your basic listeners last otherwise it will capture all requests
  • Backend targets chooses where a route should go either Backend Pool or Redirection
    • To create a rule for Backend Pool you need to create HTTP Setting
      • Defines how we want to handle cookies, connection draining, port request time out and more