overrides.conf

[global]
; Override default pid file
pid = /run/php-fpm.pid

; Avoid logs being sent to syslog
error_log = /proc/self/fd/2

[www]
; Access from webserver container is via network, not socket file
listen = [::]:9000

pm = dynamic
pm.max_children = 500
pm.max_requests = 5000
pm.start_servers = 100
pm.min_spare_servers = 100
pm.max_spare_servers = 300

; Redirect logs to stdout - FPM closes /dev/std* on startup
access.log = /proc/self/fd/2
catch_workers_output = yes

; Required to allow config-by-environment
clear_env = no

php-ini-overrides.ini

upload_max_filesize = 100M
post_max_size = 108M
memory_limit = 512M