PHP-FPM Multiple Pools on Gentoo Linux

Pool directory: /etc/php/fpm-php8.2/fpm.d/

Create /etc/php/fpm-php8.2/fpm.d/site1.conf

[site1]
user  = site1
group = site1
listen = /run/php-fpm/site1.sock
listen.owner = www-data
listen.group = www-data
listen.mode  = 0660
pm = dynamic
pm.max_children      = 10
pm.start_servers     = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 5
pm.max_requests      = 200
access.log  = /var/log/php-fpm/site1-access.log
php_admin_value[error_log]       = /var/log/php-fpm/site1-error.log
php_admin_value[open_basedir]    = /var/www/site1:/tmp

Create system user

useradd -r -s /sbin/nologin site1
mkdir -p /var/www/site1/html && chown site1:site1 /var/www/site1/html

Reload

systemctl reload php-fpm 2>/dev/null || rc-service php-fpm reload

Point Nginx at new socket

fastcgi_pass unix:/run/php-fpm/site1.sock;