yum remove docker  docker-common docker-selinux docker-engine

yum install -y yum-utils device-mapper-persistent-data lvm2

yum-config-manager --add-repo http://download.docker.com/linux/centos/docker-ce.repo
（中央仓库）

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
（阿里仓库）

yum list docker-ce --showduplicates | sort -r

yum -y install docker-ce-18.06.3.ce

systemctl start docker
systemctl enable docker