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Azure – How to retrieve the front door id from a Microsoft CDN (classic)

I have created a Microsoft CDN (classic) in Azure and I need to retrieve the value of the X-Azure-Fdid.

This value is not displayed in the Microsoft Azure Portal nor it is returned in the Azure CLI reponse.

Portal:

Microsoft Azure Portal Front Door & CDN profiles

Azure CLI:

az cdn profile list --resource-group redacted --output json
{
    "extendedProperties": {},
    "id": "/subscriptions/redacted/resourcegroups/redacted/providers/Microsoft.Cdn/profiles/testtest",
    "kind": "cdn",
    "location": "Global",
    "name": "testtest",
    "provisioningState": "Succeeded",
    "resourceGroup": "redacted",
    "resourceState": "Active",
    "sku": {
      "name": "Standard_Microsoft"
    },
    "tags": {},
    "type": "Microsoft.Cdn/profiles"
  }

az cdn endpoint list --profile-name testtest --resource-group op-1 --output json
[
  {
    "contentTypesToCompress": [
      "application/eot",
      "application/font",
      "application/font-sfnt",
      "application/javascript",
      "application/json",
      "application/opentype",
      "application/otf",
      "application/pkcs7-mime",
      "application/truetype",
      "application/ttf",
      "application/vnd.ms-fontobject",
      "application/xhtml+xml",
      "application/xml",
      "application/xml+rss",
      "application/x-font-opentype",
      "application/x-font-truetype",
      "application/x-font-ttf",
      "application/x-httpd-cgi",
      "application/x-javascript",
      "application/x-mpegurl",
      "application/x-opentype",
      "application/x-otf",
      "application/x-perl",
      "application/x-ttf",
      "font/eot",
      "font/ttf",
      "font/otf",
      "font/opentype",
      "image/svg+xml",
      "text/css",
      "text/csv",
      "text/html",
      "text/javascript",
      "text/js",
      "text/plain",
      "text/richtext",
      "text/tab-separated-values",
      "text/xml",
      "text/x-script",
      "text/x-component",
      "text/x-java-source"
    ],
    "customDomains": [],
    "geoFilters": [],
    "hostName": "testtesttest.azureedge.net",
    "id": "/redacted/resourcegroups/redacted/providers/Microsoft.Cdn/profiles/testtest/endpoints/testtesttest",
    "isCompressionEnabled": true,
    "isHttpAllowed": true,
    "isHttpsAllowed": true,
    "location": "Global",
    "name": "testtesttest",
    "originGroups": [],
    "originHostHeader": "test.com",
    "origins": [
      {
        "enabled": true,
        "hostName": "test.com",
        "httpPort": 80,
        "httpsPort": 443,
        "name": "test-com",
        "originHostHeader": "test.com",
        "priority": 1,
        "weight": 1000
      }
    ],
    "provisioningState": "Succeeded",
    "queryStringCachingBehavior": "BypassCaching",
    "resourceGroup": "redacted",
    "resourceState": "Running",
    "tags": {},
    "type": "Microsoft.Cdn/profiles/endpoints"
  }
]

The only way I was able to retrieve this ID so far was to look at the access logs on my origin server which is not ideal…

If this helps I created the CDN using Terraform and the following resource:

resource "azurerm_cdn_profile" "example" {
  name                = var.cdn_profile_name
  location            = "West Europe"
  resource_group_name = azurerm_resource_group.example.name
  sku                 = "Standard_Microsoft"
}
Tags:

2

Answers


  1. 0

    To retrieve frontdoorId (X-Azure-Fdid), you can use following commands:

    $afd = az network front-door show --name "your_frontdoor_name" --resource-group "frontdoor_resource_group_name"

$convertedafd = $afd | ConvertFrom-Json

for X-Azure-Fdid -->
$convertedafd.frontdoorId

    Documentation for the frontdoor az cli – https://learn.microsoft.com/en-us/cli/azure/network/front-door?view=azure-cli-latest#az-network-front-door-show

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  2. 0

    As of today there does not appear to be a way to a classic Microsoft CDN’s XAzureFDID value outside the logs. I can confirm that the CDN does in fact have an assigned XAzureFDID.

    I have a web app origin that is served both by a premium Front Door instance and a classic Microsoft CDN. When I look at the AppServiceIPSecAuditLogs I see the XAzureFDID column populated with a Front Door ID for all calls originating from Front Door. I also see a separate XAzureFDID for the calls originating from the Microsoft CDN.

    In the logs for calls from Front Door:
    enter image description here

    In the logs for calls from the CDN: enter image description here

    Under the Microsoft.Cdn/profiles properties for the Front Door instance, via resources.azure.com:
    enter image description here

    Under the Microsoft.Cdn/profiles properties for the classic CDN:
    enter image description here

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