Docker 安装后 报 Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? 解决办法

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刚在新的Centos 7 上安装Docker-CE,后运行docker run hello-world报错Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

解决办法

systemctl daemon-reload
sudo service docker restart
sudo service docker status (should see active (running))
sudo docker run hello-world