剛在新的Centos上安裝Docker-CE,后運行docker run hello-world報錯Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
解決辦法
$ systemctl daemon-reload
$ sudo service docker restart
$ sudo service docker status (should see active (running))
$ sudo docker run hello-world
docker 客戶端通過unix:///var/run/docker.sock與docker daemon通信，unix:///var/run/docker.sock需要管理員權限才能訪問，所以要么運行sudo docker run hello-world，要么將當前用戶添加在docker用戶組中
sudo usermod -aG docker $USER