AvailabilitySet.json

{
    "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
    "contentVersion": "0.0.1.0",
    "parameters": {
        "AvailabilitySetName": {
            "type": "String"
        },
        "faultDomains": {
            "defaultValue": 2,
            "type": "Int"
        },
        "updateDomains": {
            "defaultValue": 5,
            "type": "Int"
        },
        "sku": {
            "defaultValue": "Aligned",
            "type": "String"
        }
    },
    "resources": [
        {
            "type": "Microsoft.Compute/availabilitySets",
            "sku": {
                "name": "[parameters('sku')]"
            },
            "name": "[parameters('AvailabilitySetName')]",
            "apiVersion": "2016-04-30-preview",
            "location": "[resourceGroup().location]",
            "tags": {},
            "properties": {
                "platformUpdateDomainCount": "[parameters('updateDomains')]",
                "platformFaultDomainCount": "[parameters('faultDomains')]",
                "virtualMachines": []
            }
        }
    ]
}