执行vim /etc/sysconfig/iptables 

执行service iptables restart 
查看是否变为ACCEPT

mysql> select Host,User,Password from mysql.user;
+----------------+------------------+-------------------------------------------+
| Host           | User             | Password                                  |
+----------------+------------------+-------------------------------------------+
| localhost      | root             | *836E233974EBE6EA32F95F890A91363F8427F78B |
| iz94926clkiz   | root             | *836E233974EBE6EA32F95F890A91363F8427F78B |
| 127.0.0.1      | root             | *836E233974EBE6EA32F95F890A91363F8427F78B |
| ::1            | root             | *836E233974EBE6EA32F95F890A91363F8427F78B |
| localhost      | debian-sys-maint | *1460ED3535ABDBB887F9E5F57F40A2354610CDF3 |
+----------------+------------------+-------------------------------------------+
rows in set (0.00 sec)

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创建用户

create user test identified by '123456';

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+----------------+------------------+-------------------------------------------+
| Host           | User             | Password                                  |
+----------------+------------------+-------------------------------------------+
| localhost      | root             | *836E283974EBE6EA32F95F890A91363F8427F78B |
| iz949s6clkiz   | root             | *836E283974EBE6EA32F95F890A91363F8427F78B |
| 127.0.0.1      | root             | *836E283974EBE6EA32F95F890A91363F8427F78B |
| ::1            | root             | *836E283974EBE6EA32F95F890A91363F8427F78B |
| localhost      | debian-sys-maint | *1460ED35E5ABDBB887F9E5F57F40A2354610CDF3 |
| %              | test             | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
+----------------+------------------+-------------------------------------------+
rows in set (0.00 sec)

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授权

grant all privileges on *.* to 'test'@'%'identified by '123456' with grant option;
flush privileges;

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修改用户密码

update mysql.user set password=password('新密码') where User="test" and Host="localhost";

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删除用户

delete from user where User='test' and Host='localhost';

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