VMSS automatic instance repairs doesn't work with Load balancers health probe

Question

I want to set VMSS automatic repair, I followed below steps:

1. Enable application health monitoring for scale set via Load balancer health probes.
   the instance looked like below
   
2. Enable automatic repair, but why I got a warning ?
   

What should be done next ?

Answer 1

Hello @Jing Chen （陈静）

Thank you for reaching out to the Microsoft Q&A platform. Happy to answer your question.

The scale set should have application health monitoring for instances enabled. Health monitoring can be done using either Application Health extension or Load balancer health probes, where only one can be enabled at a time.

I see you have chosen "Load Balancer Probe". Now, before enabling automatic instance repairs policy, ensure that your scale set instances have application endpoint configured to emit the application health status.

To configure health status using Load balancer health probes, see probe up behavior.

References:
https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-custom-probe-overview
https://learn.microsoft.com/en-us/azure/load-balancer/manage-probes-how-to

Note: Please note a basic SKU load balancer health probe isn't supported with a virtual machine scale set.

Let me know in your comments in case you want to further discuss this issue.

Please accept as answer and upvote if the above information is helpful for the benefit of the community.

Answer 2

Got replay from Microsoft TS, the warning will not affect the repair function.