Docker安装
备注：-y 表示不询问，使用默认配置进行安装，等待提示，完毕。
yum install -y docker
yum list installed | grep docker
systemctl start docker
systemctl status docker
docker images
vi /etc/docker/daemon.json
{ “registry-mirrors”: [“http://f1361db2.m.daocloud.io”, “http://hub-mirror.c.163.com”, “https://registry.docker-cn.com”] }
systemctl restart docker
