Ruby on Rails

Hi Everyone, 

I'm getting the below error randomly in my Ruby On Rails application whenever the number of requests increases to the server.

Mysql2::Error::ConnectionError (Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)):

I'm not sure whether it is because of my server memory or is it something to do with mysql2 gem. Any help would be really appreciated, thanks in advance.

Ruby '2.5.0'  Rails '5.2.0  Mysql2 0.5.2  Phusion Passenger 5.3.4  Server version: Apache/2.4.6 (CentOS)  RAM SIZE: 1.5GB  MySQL Community Server (GPL): 5.6.41

Regards,
Loganathan

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