maven package docker:build - connection refused

Question

I am trying to directly build a docker image with maven with mvn package docker:build.

Docker is running and docker ps shows me my containers,

Answer 1

Below change fixed my issue on OSX El Capitan, Docker Version 1.12.1 (build: 12133):

export DOCKER_HOST=unix:///var/run/docker.sock

Please restart docker if mvn package docker:build still fails.