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Very often, when I hit Publish in VS13, I get the site to compile but when uploading I get the error saying that a file is busy.
Updating file (MyAzureSite\PrecompiledApp.config).
C:...\v12.0\Web\Microsoft.Web.Publishing.targets(4255,5):
Error ERROR_FILE_IN_USE: Web deployment task failed.
(The file 'PrecompiledApp.config' is in use.
Learn more at: http://go.microsoft.com/fwlink/?LinkId=221672#ERROR_FILE_IN_USE.)
When I follow the link provided, it's suggested that I should go for enabling the appOffline rule. "Sure!", I think to myself. But how?! I've googled it, only to get a bunch of hits on the file that's supposed to replace the site while publishing. However, I get no info on how to get rid of my little problem.
I went the easy way and downloaded a publishing profile from my Azure web site and now I'm using it (you know, ALT+B+H).
Right now I resolve the problem by going to the portal for Azure and manually take the site off-line. Then I can publish and after that I take the site on-line. Highly impractical and painfully tedious.
What is causing this and how do I kill it?
314
In a lot of scenarios, you'll want to take a web application offline while you make changes to related components, like databases or web services. Typically, in IIS and ASP.NET, you accomplish this by placing a file named App_offline. htm in the root folder of the IIS website or web application. The App_offline.
The App Offline file ( app_offline. htm ) is used by the ASP.NET Core Module to shut down an app. If a file with the name app_offline. htm is detected in the root directory of an app, the ASP.NET Core Module attempts to gracefully shut down the app and stop processing incoming requests.
Make sure that app_offline. htm is in the root of the virtual directory or website in IIS. Show activity on this post.
You actually configure it in the publishing profile (.pubxml). Just add the element to the PropertyGroup like this:
<PropertyGroup> <EnableMSDeployAppOffline>true</EnableMSDeployAppOffline> ... </PropertyGroup> More in this MSDN document
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The Azure App Service Deployment Task has a checkbox for this (from version 2.0 onwards), under Additional Deployment Options: Take App Offline. Check that and you should be good to go.
Take Application Offline: Select the option to take the AzureRM Web App offline by placing an app_offline.htm file in the root directory of the Web App before the sync operation begins. The file will be removed after the sync operation completes successfully.
Screenshot: 
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