卸载旧版本docker

$ sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine

安装 yum-utils

$ sudo yum install -y yum-utils

添加源

$ sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo       

安装 Docker

$ sudo yum install docker-ce docker-ce-cli containerd.io

启动docker

$ sudo systemctl start docker

开机启动

$ sudo systemctl enable docker