Access an Azure Storage Account having a Private endpoint via an App Service

1 minute read | By Anand Anthony Francis

About

This blob would be of help in case we are trying to access and write to blobs in an Azure Storage account from a Python Application on App Service on Linux, specifically when the Storage Account is configured with a Private Endpoint. The respective App Service leverages Swift Integration to connect with the same VNET as the Storage Account.

Steps

  1. Enable Private endpoint for the respective Azure Storage account, details for which are mentioned in this article.
  2. A sample Python application using Azure Storage SDK can be deployed to an App Service.
  3. Integrate the App Service to subnet within the same VNET that the Storage Account would be using for it’s private endpoint (private IP). Steps for configuring VNET are mentioned here.
  4. Now, once the App Service and the Storage account are configured to the same VNET, we have to do an additional step of Adding the following App Settings to the App Service.
Key Value
WEBSITE_DNS_SERVER 168.63.129.16
WEBSITE_VNET_ROUTE_ALL 1

If the above settings are not added for the App Service, we can see the following error - This request is not authorized to perform this operation.

Request not authorized

Please take into consideration that the way an App Service would communicate with a Storage Account configured with Service Endpoint is different than how it would work with Private Endpoints. The difference between Service and Private endpoints is given in this [article](https://docs.microsoft.com/en-us/azure/private-link/private-link-faq#what-is-the-difference-between-a-service-endpoints-and-a-private-endpoints)

Hope the above information helps in connecting an App Service to an Azure Storage account configured with a Private Endpoint.

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