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

docker无法使用，显示错误：Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

定位错误

启动docker时出现Job for docker.service failed because the control process exited with error code. See “systemctl status docker.service” and “journalctl -xe” for details.

[root@localhost docker]# systemctl start docker
Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.

错误原因

/etc/docker/daemon.json文件格式错误

解决方法

1. 编辑文件命令

vim /etc/docker/daemon.json

2. 修改内容

{
    
    

"registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"]

}

3. 重新加载并重新启动

docker systemctl daemon-reload
systemctl restart docker