安装docker后启动报错

想安装habor，提示安装docker高版本，发现docker已经变为docker-ce，装吧。

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

看日志：

Failed to start Docker Application Container Engine.

Unit docker.service entered failed state.

docker.service failed.

start request repeated too quickly for docker.service

报一大堆。

google一下，各种方法，还有删除docker文件的方法，晕，

后来一运行 dockerd --debug，报

INFO[2019-08-23T14:45:34.631301476+08:00] Starting up
failed to start daemon: pid file found, ensure docker is not running or delete /var/run/docker.pid

好吧，那看一下，ps -ef|grep docker，报
root      3630  5972  0 14:45 pts/2    00:00:00 grep --color=auto docker
root     11339     1  0 Jul05 ?        02:38:33 /usr/bin/dockerd-current
root     11352 11339  0 Jul05 ?        01:01:34 /usr/bin/docker-containerd-current -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libcontainerd/containerd --shim docker-containerd-shim --runtime docker-runc

原来如此， kill -9 掉各位后，重新systemctl启动docker，done！