I finally tested on a fresh install... and it works. So I dug some more, comparing the two installations, and realized at some point is a JS error on my regular install, linked to the chat integration plugin. In the end the code was outdated (it relied on a deprecated API), so I pulled the last version from git and... it worked. Long story short: this was a plugin bug Sorry for the noise, and thanks for suggesting testing a separate install!

@bangden07 Yeah, 1 CPU/2GB is not enough for Discourse+WikiJS+Cloudron+Potsgresql+etc. It's quite a heavy app (it runs ruby/rails).

Hi there, yes that is possible. The different app instances will run in their own isolated containers on the same VPS