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

场景

执行docker build命令的时候报错，信息为：
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

解决方案

执行如下命令即可

systemctl daemon-reload;
systemctl restart docker;
systemctl status docker;  # 查看状态