Azure FAQ: Can I write to the file system on Windows Azure?

Coding Out Loud

[Update 12-Oct-2012] This post only applies to Windows Azure Cloud Services (which have Web Roles and Worker Roles). This post was written a year before Windows Azure Web Sites and Windows Azure Virtual Machines (including Windows and Linux flavors) were announced and does not apply to either of them.

Q. Can I write to the file system from an application running on Windows Azure?

A. The short answer is that, yes, you can. The longer answer involves better approaches to persisting data in Windows Azure, plus a couple of caveats in writing data to (virtual) hard disks attached to the (virtual) machines on which your application is deployed.

Any of your code running in either (a) ASP.NET (e.g., default.aspx or default.aspx.cs) or (b) WebRole.cs/WorkerRole.cs (e.g., methods OnStartup, OnRun, and OnStop which are derived from RoleEntryPoint class) will not have permission to write to the file system. This. is…

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