If you choose to run Confluence as a service:
The installer will create a dedicated user account, confluence, that will run the service.
I already have ubuntu user lem which owns confluence postgres database. Should I assign confluence database to confluence user to avoid permission errors? or is there a way to clone confluence priveleges to lem?
It's a good idea to have a dedicated user for the database for the application. You don't need to, but it makes a lot of sense to do it - you'll always know what the account is for and you can keep it simple and limit it to that one purpose.
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