/includes/class_core.php on line 311 error

Hello, I use vbulletin. For this, I need to use php version 5.3. I receive error messages like this from time to time. Sometimes these messages occur 1-2 times a day and sometimes 50-60 times a day. Why does it make this error?

The socket (/var/lib/mysql/mysql.sock) exists?
Can you run PHP 5.4?
Are you running it under PHP-FPM?

The socket (/var/lib/mysql/mysql.sock) exists?
Can you run PHP 5.4?
Are you running it under PHP-FPM?

Yes, there is such a file. Since I use vbulletin 3.8.5, php 5.4 version works incorrectly. For this reason, I need to use php5.3. I use litespeed.

PHP Forums are known to be hard on mysql servers.  It's entirely possibly that the mysql server is overwhelmed with connections, thus the timeout message.   Tuning your mysql to meet your server resources, as well as caching plugins should help resolve the problem.

Consider running a MySQL tuning script for recommendations for better performance:
https://github.com/major/MySQLTuner-perl

PHP Forums are known to be hard on mysql servers.  It's entirely possibly that the mysql server is overwhelmed with connections, thus the timeout message.   Tuning your mysql to meet your server resources, as well as caching plugins should help resolve the problem.

i use already APC (Alternative PHP Cache)

Consider running a MySQL tuning script for recommendations for better performance:
https://github.com/major/MySQLTuner-perl

How to install this I am a beginner is there an installation article for cwp

Code: [Select]

cd /usr/local/src
wget https://github.com/major/MySQLTuner-perl/archive/refs/tags/v2.6.0.tar.gz
tar xzvf v2.6.0.tar.gz
cp MySQLTuner-perl-2.6.0/mysqltuner.pl /usr/local/bin/
chmod +x /usr/local/bin/mysqltuner.pl
/usr/local/bin/mysqltuner.pl