远程无法连接MySQL

1.没有授予相应的权限，假设用户：root,密码：123456；

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
mysql> FLUSH PRIVILEGES;

2.服务器防火墙；

[root@localhost ~]# firewall-cmd --zone=public --add-port=3306/tcp --permanent
[root@localhost ~]# systemctl restart firewalld.service