配置yum源：

yum -y install yum-utils
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

安装docker：

yum -y install docker-ce docker-ce-cli containerd.io

 配置开机启动：

systemctl enable docker
systemctl start docker

查看docker镜像默认存储地址：

[root@centos7-fuqiang lib]# docker info | grep Root
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled
Docker Root Dir: /home/docker-image/docker