Environment Variables List?

I’m new to Metabase and as I work through setting up I find myself looking for a couple of things;

  1. a ‘master list’ of environment variables

  2. some sort of direction on getting the many env switches to run at boot time (I know that this one is a bit of a stretch since it is OS dependent), but hey it never hurts to ask… I’m on CENTOS 7.3…