Apache and PHP-FPM

[Martin LEUSCH <sce.tech@imereos.fr>]

Hi,

I have a web server with Apache 2.4 running in worker mode and multiple 
php version with FPM service running in dynamic mode.

Sometimes php-fpm stop responding and I got a 503 error on php request 
but apache still respond to http request to other files (css, js, jpeg, 
...) then after a while apache stop respond (nothing logged on error log 
neither in access log). I have to restart apache and php-fpm services to 
unlock the server.

Off course it's append while I have malicious activity on the server, 
the last time it's happen I found a SQL injection attempt that causing 
lot of php error (maybe an infinite loop).

How can I avoid these kind of situation? Can I optimize actual settings? 
Should I use mpm_event with apache and/or ondemand process manager with 
PHP-FPM?


mpm_worker config:

    StartServers             2
    MinSpareThreads         25
    MaxSpareThreads         75
    ThreadLimit             64
    ThreadsPerChild         25
    MaxRequestWorkers      150
    MaxConnectionsPerChild   0


php-fpm pool config:

pm = dynamic
pm.max_children = 5
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3


Thanks,

Martin