卸载旧版Dokcer
yum remove docker docker-common container-selinux docker-selinux docker-engine
安装docker
1.安装依赖包
yum install -y yum-utils device-mapper-persistent-data lvm2
2.添加阿里云yum源
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
3.更新并安装Docker CE
yum makecache fast
yum -y install docker-ce
4.启动Docker
service docker start