Cannot connect to the Docker daemon at tcp://127.0.0.1:2375. Is the docker daemon running?
已确认docker是启动状态，主要是环境变量配置问题导致
unset DOCKER_HOST unset DOCKER_TLS_VERIFY unset DOCKER_TLS_PATH docker ps
docker 命令报错
原文：https://blog.51cto.com/13504746/2435494
