MySQL root密碼找回

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以MySQL多執行個體為例，示範找回MySQL root的密碼

1、關閉mysql服務

[[email protected] ~]# mysqladmin -uroot -poldboy123 -S /data/3306/mysql.sock shutdown  ==>通過mysqladmin shutdown優雅關閉mysql服務。[[email protected] ~]# lsof -i:3306

2、使用--skip-grant-tables參數後台啟動mysql，忽略授權驗證直接登入

[[email protected] ~]# mysqld_safe --defaults-file=/data/3306/my.cnf --skip-grant-tables &  ==>--skip-grant-tables這個參數一定要放在預設檔案的後面，&表示後台啟動。[1] 63540[[email protected] ~]# 160216 22:27:26 mysqld_safe Logging to ‘/data/3306/mysql_oldboy3306.err‘.160216 22:27:26 mysqld_safe Starting mysqld daemon with databases from /data/3306/data^C[[email protected] ~]# lsof -i:3306COMMAND   PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAMEmysqld  64277 mysql   12u  IPv4 127392      0t0  TCP *:mysql (LISTEN)

3、登入mysql，使用update語句修改MySQL root密碼

[[email protected] ~]# mysql -S /data/3306/mysql.sock   ==>做了忽略授權認證，不用密碼直接登入；Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 1Server version: 5.5.32-log Source distributionCopyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.mysql> update mysql.user set password=PASSWORD("oldboy123") where user=‘root‘ and host=‘localhost‘; ==>使用update語句修改MySQL root密碼。Query OK, 0 rows affected (0.26 sec)Rows matched: 1  Changed: 0  Warnings: 0mysql> flush privileges;  ==>一定要重新整理授權表。Query OK, 0 rows affected (0.05 sec)mysql> \qBye

4、使用修改後的root密碼登入mysql

[[email protected] ~]# mysql -uroot -poldboy123 -S /data/3306/mysql.sock  ==>使用root密碼登入。Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 4Server version: 5.5.32-log Source distributionCopyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.mysql> 

 

至此，找回並修改root密碼成功。

 

MySQL root密碼找回