MySQL root密码的重置方法

可以通过添加--ship-grant-tables参数来跳过权限表。

1、忘记root密码，进不去数据库：

这个时候需要强制停库，先查看MySQL进程号

Kill掉MySQL进程，命令如下：

Kill完可以再查看是否还有进程

[root@tse2 tmp]# kill -9 9840 1[root@tse2 tmp]# ps -ef |grep mysql

然后加跳过权限表参数，重启数据库。这样即使不输入密码，也可以进入数据库。

[root@tse2 bin]# mysqld_safe --defaults-file=/etc/my.cnf --skip-grant-tables &[1] 4854

给root用户设置新的密码并刷新权限，MySQL5.7之后，库下的password字段用authentication_string字段代替。

(product)root@localhost:mysql.sock [(none)]> use mysql;Database changed(product)root@localhost:mysql.sock [mysql]> update user set authentication_string=password('123456') where user='root';Query OK, 0 rows affected, 1 warning (0.00 sec)Rows matched: 1  Changed: 0  Warnings: 1(product)root@localhost:mysql.sock [mysql]> flush privileges;Query OK, 0 rows affected (0.00 sec)

[root@tse2 bin]# mysqld_safe --deaults-file=/etc/my.cnf &[2] 6720[root@tse2 bin]# 2020-01-16T02:55:45.223195Z mysqld_safe Logging to '/mysql/mysql3306/logs/error.log'.2020-01-16T02:55:45.262302Z mysqld_safe A mysqld process already exists[2]+  Exit 1                  mysqld_safe --deaults-file=/etc/my.cnf[root@tse2 bin]# mysqlERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

[root@tse2 bin]# mysql -uroot -pEnter password: Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 4Server version: 5.7.23-log MySQL Community Server (GPL)Copyright (c) 2000, 2018, 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.(product)root@localhost:mysql.sock [(none)]> use mysqlDatabase changed(product)root@localhost:mysql.sock [mysql]> show databases;+--------------------+| Database           |+--------------------+| information_schema || mysql              || performance_schema || sys                |+--------------------+4 rows in set (0.01 sec)

1、忘记root密码，进不去数据库：

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