nginx + php-fpm: how to specify memory limit for an application

Solution 1:

You've got a couple of options. You can either:

Set the fastcgi_param of PHP_VALUE to be the relevant setting in the nginx configuration: fastcgi_param PHP_VALUE "memory_limit = 128M";
Set it via the php_value setting in the FPM pool configuration file. Something like php_value[memory_limit] = 128M. Use php_admin_value if you don't want the setting to be overridable via ini_set.