docker报错:Failed to start Docker Application Container Engine.

编辑完daemon.json时，准备systemctl start docker.service启动docker时报以下错误
qyh@qyh-master:/etc/docker$ systemctl status docker.service 
● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; disabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sun 2019-02-24 15:55:21 CST; 1min 6s ago
     Docs: https://docs.docker.com
  Process: 31155 ExecStart=/usr/bin/dockerd -H fd:// (code=exited, status=1/FAILURE)
 Main PID: 31155 (code=exited, status=1/FAILURE)

2月 24 15:55:21 qyh-master systemd[1]: docker.service: Service hold-off time over, scheduling restart.
2月 24 15:55:21 qyh-master systemd[1]: docker.service: Scheduled restart job, restart counter is at 3.
2月 24 15:55:21 qyh-master systemd[1]: Stopped Docker Application Container Engine.
2月 24 15:55:21 qyh-master systemd[1]: docker.service: Start request repeated too quickly.
2月 24 15:55:21 qyh-master systemd[1]: docker.service: Failed with result 'exit-code'.
2月 24 15:55:21 qyh-master systemd[1]: Failed to start Docker Application Container Engine.
2月 24 15:55:41 qyh-master systemd[1]: docker.service: Start request repeated too quickly.
2月 24 15:55:41 qyh-master systemd[1]: docker.service: Failed with result 'exit-code'.
2月 24 15:55:41 qyh-master systemd[1]: Failed to start Docker Application Container Engine.

编辑daemon.json文件中的内容有错才导致启动失败，我检查了好几次该文件的内容，因为是复制的内容，所以符号是中文的，单词也拼写错误，需要注意的几点如下：
1、注意符号是否是英文符号

2、单词是否拼写正确

3、json文件格式是否正确

最后正确的格式：