Centos7 安装Docker

Uninstall old versions

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

SET UP THE REPOSITORY

$ sudo yum install -y yum-utils

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

INSTALL DOCKER ENGINE

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

Start Docker.

$ sudo systemctl start docker

参考：https://docs.docker.com/engine/install/centos/