vim /etc/mysql/my.cnf

bind-address = 0.0.0.0

/etc/init.d/mysql restart

mysql -uroot -p1234

# grant all privileges on *.* to root@'%' identified by '1234' with grant option;
or

#grant all privileges on *.* to root@'<HOST_IP>' identified by '1234' with grant option;

flush privileges;