apt -y install apt-transport-https lsb-release ca-certificates curl
wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
sh -c 'echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list'
apt update

apt install php5.6   [PHP 5.6]
apt install php7.0   [PHP 7.0]
apt install php7.1   [PHP 7.1]
apt install php7.2   [PHP 7.2]
apt install php7.3   [PHP 7.3]
apt install php7.4   [PHP 8.0]
apt install php8.1   [PHP 8.1]

指定默认版本

update-alternatives --set php /usr/bin/php5.6

第一 更新升级系统

apt update
apt upgrade -y 
apt -y install wget nano dbconfig-common sqlite3 certbot

第二 安装postfix 和 dovecot

apt install postfix postfix-sqlite
apt install dovecot-core dovecot-sqlite dovecot-lmtpd dovecot-imapd dovecot-pop3d 

第三 ，安装 web 服务

- 阅读剩余部分 -