When I run ./discourse-setup, I get this message. I have 39GB of space on my server so that shouldn’t be an issue. Also, I have Docker at version 19.03.1 so that shouldn’t be the problem. I have definitely downloaded the Discourse Docker image through Git and it is in /var/discourse.
registry-1.docker.io is down or you have a networking problem.
You have cloned the Discourse repository from Github into
/var/docker. When the setup script runs it will try to download the base docker image from Docker Hub.
It is the second part that is failing. As @pfaffman says, that’s either because (1) the docker hub was unavailable at the time or (2) your server networking has a problem.