addMsiToExistingVM.json

{
    "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "vmName": {
            "type": "string"
        },
        "location": {
            "type": "string"
        }
    },
    "resources": [
        {
            "apiVersion": "2017-03-30",
            "type": "Microsoft.Compute/virtualMachines",
            "name": "[parameters('vmName')]",
            "location": "[parameters('location')]",
            "identity": {
                "type": "systemAssigned"
            }
        },
        {
            "type": "Microsoft.Compute/virtualMachines/extensions",
            "name": "[concat(parameters('vmName'),'/ManagedIdentityExtensionForLinux')]",
            "apiVersion": "2016-03-30",
            "location": "[parameters('location')]",
            "dependsOn": [
                "[concat('Microsoft.Compute/virtualMachines/', parameters('vmName'))]"
            ],
            "properties": {
                "publisher": "Microsoft.ManagedIdentity",
                "type": "ManagedIdentityExtensionForLinux",
                "typeHandlerVersion": "1.0",
                "autoUpgradeMinorVersion": true,
                "settings": {
                    "port": 50343
                },
                "protectedSettings": {}
            }
        }
    ]
}