安装
1.更新
apt-get update
2.安装nginx
apt-get nginx
3.安装mysql5.7
apt-get -y mysql-server-5.7 mysql-client-5.7
4.安装php7 apt直接安装会报错，需添加仓库
apt-get install -y software-properties-common
add-apt-repository ppa:ondrej/php
apt-get update
apt-cache search php7.2
apt-get install php7.2 php7.2-fpm ... php7.2-xml
