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Plesk error pool seems busy - Fix it Now ?

This article covers methods to resolve Plesk error pool seems busy. This error happens when the PHP-FPM pm.max_children has been reached by the website(s). 


To Increasing pm.max_children for one domain via a command-line interface:

1. Create a php.ini file in domain's system directory /var/www/vhosts/system/example.com/conf/:

$ touch /var/www/vhosts/system/example.com/conf/php.ini

2. Open the php.ini file in any text editor (for example, vi editor) and add the following records:

[php-fpm-pool-settings]
pm.max_children = 20

3. Save the changes and close the file.

4. Run the following command to apply the changes:

/usr/local/psa/bin/php_settings -u



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