docker启动失败（can't create unix socket /var/run/docker.sock: is a directory）

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现象

# service docker start
Redirecting to /bin/systemctl start docker.service
Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
# systemctl status docker.service
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
Drop-In: /usr/lib/systemd/system/docker.service.d
└─flannel.conf
Active: failed (Result: exit-code) since Wed -- :: UTC; 20s ago
Docs: https://docs.docker.com
Process: ExecStart=/usr/bin/dockerd (code=exited, status=/FAILURE)
Main PID: (code=exited, status=/FAILURE)
****** systemd[1]: Starting Docker Application Container Engine...
****** dockerd[10689]: can't create unix socket /var/run/docker.sock: is a directory
****** systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
******systemd[1]: Failed to start Docker Application Container Engine.
******systemd[1]: Unit docker.service entered failed state.
******systemd[1]: docker.service failed.