If you want to enable mysql error log then explicitly you have to enable option /etc/my.cnf file and after that you have to restart mysql service.
You have to follow below steps:
	
		
	
		
	
		
								You have to follow below steps:
- Login to server via SSH as root.
 - Here check your /etc/my.cnf file and add below line in [mysqld] section.
 
		Code:
	
	log-error=/var/log/mysqld.log
	- If you are working on MariaDB server then you have to modify /etc/my.cnf file and add below line in MariaDB section:
 - Add the following line below the [mariadb] section:
 
		Code:
	
	[mariadb]
log_error=/var/log/mysqld.log
	- Save my.cnf file and restart MySQL.
 
		Code:
	
	/scripts/restartsrv_msyql