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For hosting our web sites in a Windows load-balanced environment we've traditionally used DFSR to sync folders between servers with our hosting company.

We're looking to migrate a lot of our sites to Amazon EC2 and I'm playing around with load balanced setups at the moment. That's all going fine, but now I'm onto trying to get folders/drives to sync between web servers.

Ideally I'd like to use DFSR, but it relies on having a domain controller in order to sync folders. After some research into setting up a DC on EC2 it appears that this is quite tricky (and somewhat outside my area of expertise as a developer) but I've seen it said once or twice that it's not necessarily that reliable?

So far alternatives I've looked into:

  • Network share from www1 to www2 - if this is on a single web server then it provides a single point of failure (plus we've had performance issues with this).
  • Network share on a separate "micro" Windows instance - again, provides a single point of failure as if this instance goes down then the whole site
  • Cached network drive - I investigated using a cached network drive to get around the "single point of failure" issue, however, it's tricky to get a persistent networked drive that IIS will be able to see, and even then, I couldn't see a way to cache it (plus I'm not sure how quickly changes would be replicated between machines).
  • Robocopy - from what I've seen this this could be useful if I ran it every minute, but it looks like it won't copy locked files? Also, there would be a lag in sync-times

Sorry if that's not explained very well or I've missed something obvious. Has anyone come up with a good, reliable method of syncing folders between web servers on Amazon EC2 which is as good as DFSR (or close)?

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    windows 2012 has the ability to support file server scale out, I'm just not sure if amazon support this process and if its economical. – tony roth Aug 12 '13 at 15:01
  • Amazon says that 2012 pricing is the same as any other version of windows, and that you can create a Storage Space on EBS volumes. So, this could easily be the winner. – mfinni Aug 12 '13 at 15:29
  • Interesting - I'll take a look at that today - thanks guys :) – tristankoffee Aug 13 '13 at 8:44
  • How often do your files really change? – Dusan Bajic Aug 13 '13 at 8:49
  • @dusan.bajic, it depends on the client and website, we generally need it for CMS sites where the client will be regularly uploading content and assets. – tristankoffee Aug 13 '13 at 16:38
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Use S3 for user generated content (one bucket that all webservers will have access to), and keep application on EC2 webservers?

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  • Thanks for the suggestion, but we are moving existing applications onto EC2, some of which would require a fair amount of dev to integrate with S3. Do you know of a reliable way of mapping S3 to a drive on Windows server? I'd be looking for something that works like Dropbox but for S3 (i.e. content is stored locally, but synced between S3 as it changes locally/on S3) – tristankoffee Aug 14 '13 at 8:51
  • You can find some third party tools recommendations on AWS forums but I believe none of them is officially supported by Amazon. I've successfully used s3.exe from s3.codeplex.com to sync windows folder with s3 bucket but not for real-time sync. – Dusan Bajic Aug 14 '13 at 10:11

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