multiple vanillaforum instances for performance/high availability
I'm currently testing using Vanilla forum in a docker cluster. Ideally I'd like multiple load-balanced instances of vanilla-forum talking to a single database to make for cheap/easy scaling and zero downtime on my VPSes.
Is there any documentation on creating a single forum with multiple load-balanced forum instances? Most of the guides here seem to assume a single machine running the vanillaforum app, which does not sit well with me. I'd much rather use a bunch of cheap low power VPSes than a single high spec one for performance, HA etc.
So far I've put the 'config' and 'upload' directories in a shared Docker volume that all of the Vanilla Forum instances read/write to, which seems to work for the most part. However, I'm seeing some strange issues with the "Yet Another Gamification Application" application add on - depending which instance I'm routed to, the settings mess up, which suggests to me there's some more folders I need to share between the instances to get this approach working. Is there any documentation on what folders need to be shared between multiple instances of the same vanillaforum forum? I surely can't be the first person to run multiple load-balanced instances. Similarly, is there anything else I should be aware of, or settings I should change?