apt-get install libapache2-mod-ruid2
a2enmod mpm_prefork
service apache2 restart
service php7.0-fpm restart
cp /etc/php/7.0/fpm/pool.d/www.conf /etc/php/7.0/fpm/pool.d/{YOUR_DOMAIN_NAME}.conf
vim /etc/php/7.0/fpm/pool.d/{YOUR_DOMAIN_NAME}.conf
and change the parameters