CodexBloom - Programming Q&A Platform

Azure Data Lake Storage Access Policies optimization guide as Expected for Azure Functions

👀 Views: 21 đŸ’Ŧ Answers: 1 📅 Created: 2025-06-08
azure-functions azure-data-lake managed-identity C#

I'm optimizing some code but I've hit a wall trying to I'm working on a project and hit a roadblock. I'm currently working on an Azure Function that needs to access files in Azure Data Lake Storage Gen2. I've set up access policies using Azure AD roles, but I'm working with a `403 Forbidden` behavior when trying to read from the storage. My Azure Function is running on .NET 6, and I've configured it with a managed identity, which I believe should have the necessary permissions. I've verified that the managed identity is enabled for the Azure Function, and I granted it the `Storage Blob Data Reader` role at the container level in the Azure portal. However, I'm still working with issues. Here's a snippet of my function code: ```csharp using Azure.Storage.Files.DataLake; using Microsoft.Azure.WebJobs; using Microsoft.Extensions.Logging; public class MyFunction { private readonly DataLakeServiceClient _dataLakeServiceClient; public MyFunction(DataLakeServiceClient dataLakeServiceClient) { _dataLakeServiceClient = dataLakeServiceClient; } [FunctionName("MyFunction")] public async Task Run([TimerTrigger("0 */5 * * * *")] TimerInfo myTimer, ILogger log) { try { var filesystemClient = _dataLakeServiceClient.GetFileSystemClient("myfilesystem"); var directoryClient = filesystemClient.GetDirectoryClient("mydirectory"); var fileClient = directoryClient.GetFileClient("myfile.txt"); var downloadResponse = await fileClient.ReadAsync(); using var reader = new StreamReader(downloadResponse.Value.Content); var fileContent = await reader.ReadToEndAsync(); log.LogInformation(fileContent); } catch (Exception ex) { log.LogError($"behavior: {ex.Message}"); } } } ``` I've also checked the Azure portal logs, and they show that the identity is successfully authenticated, but it's still being denied access. I've even tried reassigning the role and waiting a few minutes for the changes to propagate, but nothing seems to work. Am I missing something in the configuration, or is there another permission I need to be aware of? I'm open to any suggestions. I'm working in a macOS environment. Is this even possible?