root

密碼忘記，重置mysql的root密碼

：t

一、修改mysql的配置文件my.cnf

1.

在[mysqld]的段中加上一句：skip-grant-tables

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

skip-name-resolve

skip-grant-tables

保存并且退出vi。

(

或執行?mysqld_safe?--skip-grant-tables?&

)

2.重新啟動mysqld

#?/etc/init.d/mysqld?restart

Stopping?MySQL:?[?OK?]

Starting?MySQL:?[?OK?]

3.登錄并修改MySQL的root密碼

#?/usr/bin/mysql

Welcome?to?the?MySQL?monitor.?Commands?end?with?;?or?\g.

Your?MySQL?connection?id?is?3?to?server?version:?3.23.56

Type?'help;'?or?'\h'?for?help.?Type?'\c'?to?clear?the?buffer.

mysql>?use?mysql?;

Reading?table?information?for?completion?of?table?and?column?names

You?can?turn?off?this?feature?to?get?a?quicker?startup?with?-A

Database?changed

mysql>

update user set authentication_string = password('root'), password_expired = 'N', password_last_changed = now() where user = 'root';

Query?OK,?0?rows?affected?(0.00?sec)

Rows?matched:?2?Changed:?0?Warnings:?0

mysql>?flush?privileges?;

Query?OK,?0?rows?affected?(0.01?sec)

mysql>?quit

Bye

4.將MySQL的登錄設置修改回來

#?vi?/etc/my.cnf

將剛才在[mysqld]的段中加上的skip-grant-tables刪除

保存并且退出vi。

5．重新啟動mysqld

#?/etc/init.d/mysqld?restart

Stopping?MySQL:?[?OK?]

Starting?MySQL:?[?OK?]

二、

停止mysql服務

/etc/init.d/mysqld?stop

sudo?mysqld_safe?--skip-grant-table&

mysql

use?mysql;

update?user?set?password?=?password('yourpasswd')?where?user?=?'root';

flush?privileges;

重啟下mysql服務即可重新用新密碼登錄

/etc/init.d/mysqld?restart

允許遠程連接mysql

通過navicat連接MySQL的時候發生的這個錯誤

ERROR?1130:?Host?***.***.***.***?is?not?allowed?to?connect?to?this?MySQL?server

說明所連接的用戶帳號沒有遠程連接的權限，只能在本機(localhost)登錄。

需更改?MySQL?數據庫里的?user表里的?host項

把localhost改稱%

一、

登陸到MySQL?，首先?use?MySQL；

按照別人提供的方式update的時候，出現錯誤。

MySQL>?update?user?set?host='%'?where?user?=?'root';

ERROR?1062?(23000):?Duplicate?entry?'%-root'?for?key?'PRIMARY'

然后查看了下數據庫的host信息如下：

MySQL>?select?host?from?user?where?user?=?'root';

+-----------------------+

|?host?|

+-----------------------+

|?%?|

|?127.0.0.1?|

|?localhost.localdomain?|

+-----------------------+

3?rows?in?set?(0.00?sec)

host已經有了%這個值，所以直接運行命令：

MySQL>flush?privileges;

二、

mysql>

grant?all?privileges?on?*.*?to?'root'@'%'?with?grant?option;

Query?OK,?0?rows?affected?(0.02?sec)

mysql>

flush?privileges;

Query?OK,?0?rows?affected?(0.00?sec)

mysql>

selectuser.host?from?user;

+-----------+--------------+

|?user|?host|

+-----------+--------------+

|?root|

%

|

|?root|?127.0.0.1|

|?repl_user?|?192.168.1.52?|

+-----------+--------------+

3?rows?in?set?(0.00?sec)

允許指定

IP

訪問

mysql

mysql>

grant?all?privileges?on?*.*?to

'root'@116.224.126.250

identified?by?'123456';

QueryOK,?0?rows?affected?(0.00?sec)

總結

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