Feature Request: Application Gateway Backend Pool in VMSS

[geftactics]

Terraform Version

Terraform v0.11.3

• provider.azurerm v1.1.1

Affected Resource(s)

azurerm_virtual_machine_scale_set (When used with azurerm_application_gateway)

I'm deploying azurerm_virtual_machine_scale_set with azurerm_application_gateway, but I can't see a way to associate the VMSS nodes, with the backend pool.

It can be done successfully using azurerm_lb...

azurerm_virtual_machine_scale_set.network_profile.ip_configuration.load_balancer_backend_address_pool_ids = ["${azurerm_lb_backend_address_pool.bpepool.id}"]

But if I swap out the backend pool id for one used by azurerm_application_gateway I get the following error:

ag-beap is referencing resource of a wrong type. The Id is expected to reference resources of type loadBalancers/backendAddressPools.

Should there be another attribute under azurerm_virtual_machine_scale_set.network_profile.ip_configuration - Like application_gateway_backend_pools?

...or maybe there is another way to do this that I'm missing?

[tombuildsstuff]

Hey @squiggleuk

Thanks for opening this issue :)

Taking a quick look into this - it appears there's a separate block available in ARM Templates and the API which is required to connect an Application Gateway attached to the VM Scale Sets. I've verified that support for configuring the Application Gateway backend exists in the Azure SDK - as such we should be able to implement this in the near future.

Thanks!

[bob2build]

+1 for this feature

[wtfiwtz]

Hi @bob2build you could manually build this Pull Request (#884) or alternatively use this CLI / Powershell code (#619 (comment)) to manually attach the App Gateway to the VMSS after it is built

Just remember to "upgrade" your VMSS instances afterwards for them to be attached to the App Gateway.

[bob2build]

Thanks @wtfiwtz You are a life saver.

[ghost]

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