忘記mysql或mariadb數據庫的密碼之解決方案

一、實驗環境

CentOS Linux release 7.5.1804 (Core)

mysql  Ver 15.1 Distrib 5.5.56-MariaDB, for Linux (x86_64) using readline 5.1

二、實施方案

第一步：添加--skip-grant-tables

在/etc/my.cnf.d/server.cnf中[mysqld]下面添加選項

[mysqld]
skip-grant-tables

 

第二步：重啟數據庫

[root@ken ~]# systemctl restart mariadb

 

第三步：登錄數據庫

現在發現可以在不輸入密碼的情況下直接登錄進數據庫

[root@ken ~]# mysql -uroot
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 2 Server version: 5.5.56-MariaDB MariaDB Server Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. MariaDB [(none)]> 

 

第四步：修改密碼

這個時候使用grant修改密碼會報如下的錯誤

MariaDB [(none)]> grant all on *.* to root@'localhost' identified by '123'; ERROR 1290 (HY000): The MariaDB server is running with the --skip-grant-tables option so it cannot execute this statement

 

使用set修改密碼也會報同樣的錯誤

MariaDB [(none)]> set password for root@localhost=password('123'); ERROR 1290 (HY000): The MariaDB server is running with the --skip-grant-tables option so it cannot execute this statement

 

現在使用update即可進行修改

MariaDB [(none)]> use mysql;   #切換至mysql數據庫
Database changed

MariaDB [mysql]> update user set password=password('123') where user='root'; Query OK, 3 rows affected (0.00 sec) Rows matched: 4 Changed: 3 Warnings: 0

 

第五步：注銷掉配置文件中的選項

[root@ken ~]# vim /etc/my.cnf.d/server.cnf
...
[mysqld]
#skip-grant-tables

 

第六步：重啟數據庫

[root@ken ~]# systemctl restart mariadb

 

第七步：再次登錄進行驗證

現在不輸入密碼被直接拒絕

[root@ken ~]# mysql -uroot
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

 

輸入密碼123即可進行登錄

[root@ken ~]# mysql -uroot -p123
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 3 Server version: 5.5.56-MariaDB MariaDB Server Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. MariaDB [(none)]>