server reached pm.max_children setting (5), consider raising it

Question

The website is down with the following error in the server logs.

server reached pm.max_children setting (5), consider raising it

I tried to set its value to 32 in /usr/local/etc/php-fpm.d/www.conf but when I try to access website it says 504 and after refreshing the web ssh pm.max_children auto set to 5. I also kill pm process using and start it again

ps aux | grep php-fpm

kill -9 <php-fpm_pid>

/usr/local/sbin/php-fpm

Answer 1

Thanks for posting your question in the Microsoft Q&A forum.

This error indicates that your PHP-FPM configuration is limiting the number of concurrent PHP processes to 5, which is insufficient for your website's traffic. To resolve this issue:

Edit the PHP-FPM configuration file (/usr/local/etc/php-fpm.d/www.conf) and set a higher value for pm.max_children

pm.max_children = 32

After modifying the configuration, restart PHP-FPM to apply the changes

sudo service php-fpm restart

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