移除旧版

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

安装一些必要的工具

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

添加软件源信息

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

更新缓存

yum makecache fast

安装docker

yum -y install docker-ce

设置开机启动

systemctl enable docker
systemctl start docker

验证是否安装成功

docker info