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PHP-FPM Configurations

PHP-FPM (FastCGI Process Manager) is an alternative PHP FastCGI implementation with some additional features useful for sites of any size, especially busier sites.


apt install php-fpm


The FPM's main configuration file is /etc/php/$VERSION/fpm/php.ini.

Memory limit

Maximum amount of memory that the PHP script can use.

memory_limit = 128M

FPM Pool

It is possible to isolate the php codes with fpm pools.

First, create a new user to the new pool:

adduser --no-create-home --disabled-login pooluser

Create the new pool file (copy the existing one):

cp /etc/php/7.2/fpm/pool.d/www.conf /etc/php/7.2/fpm/pool.d/newpool.conf

Modify the new pool's configurations:

nano /etc/php/7.2/fpm/pool.d/newpool.conf
# The section name must be changed from [www]


# The user who will be run the process
user = pooluser
group = pooluser


# The new pool's socket's name
listen = /run/php/php-fpm-newpool.sock

Other configurations may be needed. The above ones are the basics to create a new pool.

Change the files ownership to the new user:

chown -R pooluser:pooluser /path/to/code