1,查看内核版本
uname -r

2，卸载老版本
yum remove -y docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-selinux \
docker-engine-selinux \
docker-engine

3，安装必要组件
yum install -y yum-utils device-mapper-persistent-data lvm2

4，安装仓库
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

5，安装docker-ce
yum install -y docker-ce

6，启动docker
systemctl start docker

7，开机自启动
systemctl enable docker