sudo apt-get install apache2
sudo vi /etc/apache2/ports.conf
Listen 80 -> Listen 81
sudo systemctl restart apache2
sudo ufw allow 81
mkdir /var/www/web
cd /var/www/web && vi index.html
mkdir /etc/httpd/sites
vi /etc/httpd/conf/httpd.conf
#增加项
IncludeOptional /etc/httpd/sites/*.conf
vi /etc/httpd/sites/default.conf
#配置内容
<VirtualHost *:80>
ServerName hello.html.com
ServerAlias html.com
DocumentRoot /var/www/web/
ErrorLog /var/www/web/error.log
CustomLog /var/www/web/requests.log combined
</VirtualHost>