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Windows service which can sync IIS website with blob storage
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Azure Downloader

This is a Windows service which you can run inside your Web Role to sync website contents with a file stored in Blob storage. It holds some properties:

  • Runs inside a Web Role, no need for additional worker role
  • File stored in blob storage is a Zip archive, so downloads and uploads are very fast
  • Shared access url is used, rather than it connecting to Blob storage with admin rights, role itself can't change the blob or any of the files stored in a container
  • File is checked with HEAD request and only downloaded if new ETag is present, thus reduces bandwith out of an instance
  • Configurable refresh interval

This is somewhat close to what was used for Azure+.


This service only needs two configuration parameters: APP_URL and APP_INTERVAL. So first add these to ServiceDefinition.csdef:

    <Setting name="APP_URL" />
    <Setting name="APP_INTERVAL" />

And then configure as you want in ServiceConfiguration.cscfg.

Auto Install

Installing this service is easy through a cmd script which you can run as a startup task (add this <Task commandLine="install-service.cmd" executionContext="elevated" taskType="background" /> to Startup node), just create a install-service.cmd file with contents like:

@echo off

ECHO Starting APP update setup >> log.txt

IF EXIST %WINDIR%\Microsoft.NET\Framework64 (
%WINDIR%\Microsoft.NET\Framework64\v4.0.30319\installutil.exe /u /LogToConsole=false ..\Assets\AzureDownloader.exe >> log.txt 2>>err.txt
%WINDIR%\Microsoft.NET\Framework64\v4.0.30319\installutil.exe /i /LogToConsole=false ..\Assets\AzureDownloader.exe >> log.txt 2>>err.txt
) ELSE (
%WINDIR%\Microsoft.NET\Framework\v4.0.30319\installutil.exe /u /LogToConsole=false ..\Assets\AzureDownloader.exe >> log.txt 2>>err.txt
%WINDIR%\Microsoft.NET\Framework\v4.0.30319\installutil.exe /i /LogToConsole=false ..\Assets\AzureDownloader.exe >> log.txt 2>>err.txt

net start "Azure Downloader" >> log.txt 2>>err.txt

ECHO Completed APP update setup >> log.txt

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