Azure 应用程序网关未在后端池中显示来自其他 VNet 的 VM

Question

When setting up the Backend pools of an Azure Application Gateway, I want to set a specific VM in the pool.

This VM is in another VNet, and I've set up peering between the App Gateway's VNet and the VM's VNet.

Still, when I choose Virtual Machine as the target type of the Backend pool, the list is empty and I don't see any VM.

What's the problem? Am I missing something?

Answer 1

It seems that you only could see VMs in the same VNet as the application gateway located when you select the virtual machine as the target type of the backend pool.

If you have VNet peering, you can just add the internal IP of the VM to target the backend pool.

A backend pool routes request to backend servers, which serve the request. Backend pools can contain:

• NICs
• Virtual machine scale sets
• Public IP addresses
• Internal IP addresses
• FQDN
• Multitenant backends (such as App Service)

If you use internal IPs as backend pool members, you must use virtual network peering or a VPN gateway. Virtual network peering is supported and beneficial for load-balancing traffic in other virtual networks.

Reference: https://docs.microsoft.com/en-us/azure/application-gateway/application-gateway-components#backend-pools