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Microsoft Certified: DevOps Engineer Expert · Microsoft
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The Azure Load Balancer resource is one lightweight platform probe, its definition does not support attaching client certificates or linking to Azure Key Vault secrets. There is no property in the Azure Resource Manager (ARM) template or API schema for Microsoft.Network/loadBalancers/probes to pass a private key or .pfx certificate. so we have to choose D the Application Health extension in each VM to perform mTLS health check.
Application Health Extension
D: For the use of VM Scale Set, using load balance via code within your build of a web app in Azure DevOps for example, the “Application Health extension” is used, which will play the role similar to a Load Balancer Health probe within the portal. This extension used in your code checks the response of a Vm Scale Set sizing instance. When one of the instances to be scheduled does not respond through the configured TCP port, it will have the status of Unhealthy. If you need an autoscale and it doesn't respond, this extension can perform automatic repairs for that instance. Example JSON code from a REST API. It also runs on Azure PowerShell and Azure CLI 2.0.