在centos7环境下启动docker报错

报错信息如下：

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

根据提示命令：systemctl status docker.service查看启动报错日志，如下：

● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since 日 2019-08-18 22:14:20 CST; 8min ago
     Docs: https://docs.docker.com
  Process: 2182 ExecStart=/usr/bin/dockerd (code=exited, status=1/FAILURE)
 Main PID: 2182 (code=exited, status=1/FAILURE)

8月 18 22:14:20 p-docker systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
8月 18 22:14:20 p-docker systemd[1]: Failed to start Docker Application Container Engine.
8月 18 22:14:20 p-docker systemd[1]: Unit docker.service entered failed state.
8月 18 22:14:20 p-docker systemd[1]: docker.service failed.
8月 18 22:14:20 p-docker systemd[1]: docker.service holdoff time over, scheduling restart.
8月 18 22:14:20 p-docker systemd[1]: start request repeated too quickly for docker.service
8月 18 22:14:20 p-docker systemd[1]: Failed to start Docker Application Container Engine.
8月 18 22:14:20 p-docker systemd[1]: Unit docker.service entered failed state.
8月 18 22:14:20 p-docker systemd[1]: docker.service failed.

 根据具体报错信息：Failed to start Docker Application Container Engine.在网上查找了下，发现可能是之前修改/etc/docker目录下的daemon.json文件，格式不对或者文件内容写错的缘故。于是查看并修改daemon.json文件，修改后，保存退出。使用命令：systemctl restart docker.service重新启动，启动成功。

参考博客：https://www.cnblogs.com/huhyoung/p/9495956.html