mailcow-dockerized/data/conf/phpfpm/php-fpm.d/system.conf

[system]
user = www-data
group = www-data
pm = dynamic
pm.max_children = 10
pm.start_servers = 2
pm.min_spare_servers = 2
pm.max_spare_servers = 4
listen = [::]:9001
access.log = /proc/self/fd/2
clear_env = no
catch_workers_output = yes