I use openproject 7.2.3 for ubuntu, the official package.
I try to run openproject on few sites, and it… almost works.
What I done was to create a copy of the /usr/bin/openproject script ( i used the name of the site, like openproject-site2 ) and also a copy of /etc/openproject with the same naming schema. I use different ports for each instance, different mysql database etc, which are exported as environement variables. The project works , but from time to time i got error 500.
I suspect it need some parameters for asset generation ( i also created the folder /opt/openproject-site2/ but I can’t manage to found how to manage this part)