卸载之前的doocker

yum remove docker \
>                   docker-client \
>                   docker-client-latest \
>                   docker-common \
>                   docker-latest \
>                   docker-latest-logrotate \
>                   docker-logrotate \
>                   docker-engine

执行结果

Loaded plugins: langpacks, versionlock
No Match for argument: docker
No Match for argument: docker-client
No Match for argument: docker-client-latest
No Match for argument: docker-common
No Match for argument: docker-latest
No Match for argument: docker-latest-logrotate
No Match for argument: docker-logrotate
No Match for argument: docker-engine
No Packages marked for removal

安装yum-utils

yum install -y yum-utils

设置镜像仓库地址

 yum-config-manager \
  --add-repo \
   http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

安装docker相关引擎

 	yum makecache fase 
yum install docker-ce docker-ce-cli containerd.io

启动docker

systemctl  start  docker

查看版本是否启动

docker version

卸载

yum  remove docker-ce docker-ce-cli containerd.io
rm -rf  /var/lib/docker 

/var/lib/docker 为docker默认的工作路径！