Function app fails to create file share with vnet integration enabled.

Question

I am creating the function app with premium plan and with the WEBSITE_CONTENTAZUREFILECONNECTIONSTRING and WEBSITE_CONTENTSHARE app settings. This fails to create the file share in the storage account and shows function host time unreachable.

It will work if I create fileshare while creating storage account but I want that to be automatically created

I have also added the WEBSITE_CONTENTOVERVNET settings

Answer 1

Hello @Hariprasad - Thanks for reaching out & posting on the MS Q&A channel!

I suspect the issue is to do with setting the WEBSITE_CONTENTSHARE. With an automatic approach via ARM, the recommended approach is to not set the WEBSITE_CONTENTSHARE app setting as it'll be auto-generated during ARM deployment. The following considerations are noted for ARM deployments:

On the other hand, as stated above, if your storage account is in a VNET, you should then specify a value for the WEBSITE_CONTENTSHARE setting.

Depending on your exact scenario, here are some working samples (maintained by MS) that you can use to enhance the one that you're working on: https://github.com/Azure-Samples/function-app-arm-templates#arm-templates-for-function-app-deployment

For the scenario where the Storage Account is secured by the VNET, it looks like the file share resource is created explicitly:

{
      "type": "Microsoft.Storage/storageAccounts/fileServices/shares",
      "apiVersion": "2022-05-01",
      "name": "[format('{0}/default/{1}', parameters('functionStorageAccountName'), variables('functionContentShareName'))]",
      "dependsOn": [
        "[resourceId('Microsoft.Storage/storageAccounts', parameters('functionStorageAccountName'))]"
      ]
}

I hope this helps, and I look forward to your reply ;)