docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock

新装的docker在运行docker run ubuntu echo “hello world” 的时候报错

• docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock
  解决办法：

vi /etc/docker/daemon.json
{
     "registry-mirrors": ["http://hub-mirror.c.163.com"]
}

保存之后

systemctl daemon-reload
systemctl restart docker.service
systemctl status docker.service

阿里云的源地址貌似有问题

{ 
   "registry-mirrors": ["https://cr.console.aliyun.com/"] 
}