开启MySQL远程连接的方法

[root@iZq2mvq6snkcniZ ~]# mysql -uroot -p123456

MySQL [(none)]>use mysql;
#查看现有用户,密码及允许连接的主机
MySQL [mysql]> SELECT User, Password, Host FROM user;  
+------+-------------------------------------------+-----------+
| User | Password         | Host  |
+------+-------------------------------------------+-----------+
| root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | localhost |
| root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | 127.0.0.1 |
+------+-------------------------------------------+-----------+
2 rows in set (0.00 sec)

#设置为所有IP都可以访问，比较危险，不建议。
MySQL [mysql]> UPDATE user SET Host=@'%' where user='root' AND Host='localhost' LIMIT 1;  
MySQL [mysql]> flush privileges;
#再次查看现有用户,密码及允许连接的主机
MySQL [mysql]> SELECT User, Password, Host FROM user;  
+------+-------------------------------------------+-----------+
| User | Password         | Host  |
+------+-------------------------------------------+-----------+
| root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |   |
| root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | 127.0.0.1 |
+------+-------------------------------------------+-----------+

[root@iZq2mvq6snkcniZ ~]# iptables -I INPUT 4 -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT
[root@iZq2mvq6snkcniZ ~]# service iptables save