docker安装之后重新安装报错如下：
Job for docker.service failed because start of the service was attempted too often. See "systemctl status docker.service" and "journalctl -xe" for details. To force a start use "systemctl reset-failed docker.service" followed by "systemctl start docker.service" again.
解决办法：直接把配置文件名称修改一下即可。
1.首先切换为root用户，输入su root，再输入密码即可。
2.进入目录下修改配置文件名称，路径：cd /etc/docker/
3.查看当前目录的配置文件，输入：ls
4.把daemon.json配置文件改成daemon.conf即可，命令：mv daemon.json daemon.conf。
然后再输入ll，看看有没有修改过来了。
5.重新启动服务，命令：sudo service docker restart
6.然后再docker ps， 运行ok了。
如果上述方法还是不行的话，建议卸载了重新再安装一遍。
1.卸载老版本docker
较旧版本的Docker被称为docker或docker-engine.请卸载它们以及相关的依赖项
$ sudo yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-selinux docker-engine-selinux docker-engine
$ sudo yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-selinux \ docker-engine-selinux \ docker-engine 2.安装 docker
安装所需的包
yum-utils提供了yum-config-manager 效用，并device-mapper-persistent-data和lvm2由需要 devicemapper存储驱动程序
$ sudo yum install -y yum-utils device-mapper-persistent-data lvm2
3.安装最新版本的Docker CE
sudo yum install docker-ce
sudo yum install docker-ce 4.启动docker
sudo systemctl start docker
sudo systemctl start docker希望对你有所帮助~
原文链接：https://blog.csdn.net/Along_168163/article/details/124118833?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522171836840916800182116382%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=171836840916800182116382&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~first_rank_ecpm_v1~times_rank-6-124118833-null-null.nonecase&utm_term=docker%E3%80%81%E5%A5%BD%E7%94%A8
