systemctl start docker启动报错：Job for docker.service failed because the

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

[root@joinApp2 ~]# systemctl status docker.service
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
Active: failed (Result: start-limit) since Thu 2016-02-25 17:26:11 CST; 16s ago
Docs:
http://docs.docker.com Process: 16384 ExecStart=/usr/bin/docker daemon $OPTIONS $DOCKER_STORAGE_OPTIONS $DOCKER_NETWORK_OPTIONS $ADD_REGISTRY $BLOCK_REGISTRY $INSECURE_REGISTRY (code=exited, status=1/FAILURE)
Main PID: 16384 (code=exited, status=1/FAILURE)
Feb 25 17:26:10 joinApp2 systemd[1]: Failed to start Docker Application Container Engine.
Feb 25 17:26:10 joinApp2 systemd[1]: Unit docker.service entered failed state.
Feb 25 17:26:10 joinApp2 systemd[1]: docker.service failed.
Feb 25 17:26:11 joinApp2 systemd[1]: docker.service holdoff time over, scheduling restart.
Feb 25 17:26:11 joinApp2 systemd[1]: start request repeated too quickly for docker.service
Feb 25 17:26:11 joinApp2 systemd[1]: Failed to start Docker Application Container Engine.
Feb 25 17:26:11 joinApp2 systemd[1]: Unit docker.service entered failed state.
Feb 25 17:26:11 joinApp2 systemd[1]: docker.service failed.

参考了网上很多解决办法都不行，后来
直接删除/etc/docker/daemon.json，问题解决
systemctl restart docker