I went to https://docs.docker.com/engine/docker-overview/ and started reading about docker. I got as far as ’ Example
docker run command’ and decided to try it. I noticed docker was already installed on my PC (openSUSE Leap 15.0 BTW) though I don’t remember how it got there. So I typed:
$ docker run -i -t ubuntu /bin/bash docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?. See 'docker run --help'.
So I typed
docker run --help and got a whole list of options but nothing that tells me how to start the docker daemon, assuming that is what I need to do.
So either the web page is wrong in starting with that example command before starting a daemon, or the command’s error message is wrong in what it told me to do, or both.
So what do I do?