I need to backup Redmine from old server and move it to server based on Perfect Server setup with Ubuntu 16.04 LTS and newest ISP install. I saw that Redmine uses own webserver like Webrick, Puma or few others but probably not Apache (I see only default vhost in sites-enabled). I would like to create Website using ISP and under it deploy Redmine. Is it possible? How? Docs says about Webrick server but only for development. PS How determine which server is used by Redmine? I can't trace neither port nor name of the server used.