I have a small- to medium-sized Django project where the client has been forced to change hosts. The new host convinced them they definitely needed a couple of web servers behind a load balancer (and to break the database off to a third server). I have everything ported over to the new setup, but I can’t make it live yet as I’m not sure what’s the best way to handle file uploads on the site as they will only get pushed up to the server the user is currently connected to. Given the three servers (counting the db which could double as a static file server if I had to), what’s the cleanest and easiest way to handle this situation?
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Simple solution which has some latency though and is not scalable beyond several servers – use rsync between hosts. Simply add it to cron to do upload dir sync both ways, also sticky session would help here – so that uploader would see their file as available immediately, and other visitors will be able to get the file after the next rsync completes.
This way you also get a free backup.
(you’ll have to have this in cron on both servers)