While both front door and application gateway are layer 7 http https load balancers the primary difference is that front door is a global service whereas application gateway is a regional service.
Front door application gateway.
Application gateway provides application delivery controller adc as a service offering various layer 7 load balancing capabilities for your application.
Refer to front door s routing architecture details and traffic routing methods to learn more about the service.
It keeps your service highly available for your users and helps you meet compliance requirements.
That is within the scale unit.
Front door is outside so the load balancer will have to accept public internet traffic.
Azure front door enables you to define manage and monitor the global routing for your web traffic by optimizing for best performance and quick global failover for high availability.
App gateway sits in your vnet in a special subnet like a dmz.
Waf on front door is a global and centralized solution.
Application gateway build secure scalable and highly available web front ends in azure.
Waf with application gateway is a regional dedicated solution.
With front door you can transform your global multi region consumer and enterprise applications into robust high performance personalized modern applications apis and content that reaches a global audience with azure.
Waf with azure front door is a globally distributed edge security solution.
Key vault safeguard and maintain control of keys and other secrets.
Vpn gateway establish secure cross premises connectivity.
I m considering using something in k8s for north south routing like traefik ambasador or contour.
We recommend you choose a solution based on your overall performance and security requirements.
Azure front door offers a single secure global entry point for web applications apis content and cloud services.
Application gateway build secure scalable and highly available web front ends in azure azure information protection better protect your sensitive information anytime anywhere vpn gateway establish secure cross premises connectivity.
Waf defends your web services against common exploits and vulnerabilities.
Azure information protection better protect your sensitive information anytime anywhere.
Azure web application firewall waf on azure front door provides centralized protection for your web applications.
However i m also not happy with app gateway.
While front door can load balance between your different scale units clusters stamp units across regions application gateway allows you to load balance between your vms containers etc.
