Azure Host-Pool and VMSS - Create Scale Rule on the Average Sessions of the Host-Pool

Alan Benet 35

I'm struggling quiet a bit at the moment with the VMSS.

I have a Host-Pool and a VMSS.

The Virtual Machines that are created from the VMSS and join the Host-Pool.

For the Host-Pool we set the limit of 16 sessions for each VM.

Since the VMSS doesn't know when the Host-Pool sessions limit is reached, I would like to add a Scale Rule which checks the average sessions count on the vms and depending on value the VMSS should increase the number of instances.

While looking for a solution I stumbled more than once on the Alert Rules.

I created an Alert Rule with a custom script. The script gives me the desired output of the average sessions on the VMs. The alert works and I see that it is launched on the Monitor page.

Now I've come to a dead end.

I don't know how to add or use the alert rule in the Scale Rule.

And I don't know if there are other solutions for it.

Could you help me? Or give any suggestions?

Nikhil Duserla 2,025 Reputation points Microsoft Vendor

2024-08-09T09:37:40.1266667+00:00

Hi @Alan Benet,

Welcome to the Microsoft Q&A Platform! Thank you for asking your question here.

For better research, please provide more details about this case:

Are you currently using Azure Virtual Desktop?

Have you linked a VMSS or VM to your host pool?

Are you looking for a solution to increase the number of instances in your VMSS when usage goes up and setting up an alert rule in the scale sets?
Nikhil Duserla 2,025 Reputation points Microsoft Vendor

2024-08-13T06:48:40.2033333+00:00

Hi @Alan Benet,

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution, please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Alan Benet 35 Reputation points

2024-08-16T06:34:52.0133333+00:00

Hi @Nikhil Duserla

Sorry for my late response.

We changed our plan.

We're working with just the Host Pool and now attached a Scale Plan to it, since using a VMSS and Host Pool together isn't really doing it for us since the metrics we would like to have for the Scale Rules aren't available and creating one ourselves takes to much work (Would be nice, if the creation of a custom metric wouldn't take that many steps and resources....)

Regardless, thanks a lot for your messages!
Nikhil Duserla 2,025 Reputation points Microsoft Vendor

2024-08-16T06:50:30.7733333+00:00

Hi @Alan Benet,

Thank you for the update. Please let me know if you encounter any issues. Based on the requirements, you may need to add a customized script for metrics.

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Azure Host-Pool and VMSS - Create Scale Rule on the Average Sessions of the Host-Pool

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