Job for docker.service failed because the control process exited with error code. See systemctl sta

docker启动的时候出现这个错误:

Job for docker.service failed because the control process exitedwith error code. See "systemctl status docker.service" and "journalctl -xe" for details.

原因：daemon.json的json格式不对，如下：

{"registry-mirrors": ["https://rj4f7247."]"log-driver":"json-file","log-opts":{ "max-size" :"100m","max-file":"1"}}

缺少一个逗号