VMSS Flex - Unable to set a load balancer probe for my scale set

Charles3828 20 Reputation points

I am trying to enable application health monitoring and use a load balancer probe and it is not working.

Through the portal, I am able to select the probe but when I click save, the page refreshes and it is not enabled.

When I check the trace in my browser logs, I see the following response from :

  "error": {
    "details": [
        "code": "InvalidJson",
        "message": "Could not find member 'healthProbe' on object of type 'VMNetworkProfile'. Path 'Properties.NetworkProfile.healthProbe', line 1, position 1227."
    "code": "InvalidRequestFormat",
    "message": "Cannot parse the request."

Is anyone else having issues? This scale set was created with Terraform using the "azurerm_orchestrated_virtual_machine_scale_set" resource.

Thank you.

Azure Virtual Machine Scale Sets
Azure Virtual Machine Scale Sets
Azure compute resources that are used to create and manage groups of heterogeneous load-balanced virtual machines.
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Accepted answer
  1. GitaraniSharma-MSFT 45,501 Reputation points Microsoft Employee

    Hello @Charles3828 ,

    Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.

    I understand that you are trying to enable application health monitoring by using a load balancer probe for your Virtual Machine Scale Sets in Flexible orchestration mode, but it is not working.

    Application health via Load balancer health probe is currently NOT supported with Virtual Machine Scale Sets in Flexible orchestration mode.

    Refer: https://learn.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-orchestration-modes#unsupported-parameters

    For Flexible scale set instances, you must install and configure the Application Health Extension on the virtual machine to monitor application health.

    Refer: https://learn.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-orchestration-modes#monitor-application-health

    You can use Application Health Extension to monitor the application health of each instance in your scale set and perform instance repairs using Automatic Instance Repairs. There are two types of Application Health extension, Binary Health States or Rich Health States, to monitor the health of your applications deployed on Virtual Machine Scale Sets.

    Binary Health States is generally available. Rich Health States is currently in public preview.

    Refer: https://learn.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-health-extension?tabs=rest-api

    Kindly let us know if the above helps or you need further assistance on this issue.

    Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

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