解決方法：1、在my.cnf中，增加“[mysqld]”和“skip-grant-tables”2行代碼，用于登錄時跳過密碼驗證；2、啟動mysql服務，并登錄mysql；3、連接mysql數據庫，使用UPDATE命令修改用戶密碼即可。

linux上mysql改密碼忘了的解決方法

修改密碼

1. 檢查mysql服務是否啟動，如果啟動，關閉mysql服務//查看mysql服務狀態

[root@mytestlnx02 ~]# ps -ef | grep -i mysql

root 22972 1 0 14:18 pts/0 00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --socket=/var/lib/mysql/mysql.sock --pid-file=/var/run/mysqld/mysqld.pid --basedir=/usr --user=mysql

mysql 23166 22972 0 14:18 pts/0 00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock

root 23237 21825 0 14:22 pts/0 00:00:00 grep -i mysql

//關閉服務

[root@mytestlnx02 ~]# service mysql stop

[root@mytestlnx02 ~]#

2. 修改mysql的配置文件my.cnf

my.cnf配置文件的位置，一般在/etc/my.cnf，有些版本在/etc/mysql/my.cnf

在配置文件中，增加2行代碼[mysqld]

skip-grant-tables

作用是登錄mysql的時候跳過密碼驗證

然后啟動mysql服務，并進入mysql[root@mytestlnx02 ~]# service mysqld start

[root@mytestlnx02 ~]#

[root@mytestlnx02 ~]# mysql -u root

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

3. 修改密碼

連接mysql這個數據庫，修改用戶密碼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 mysql.user set authentication_string=password('root_password') where user='root';

Query OK, 1 row affected, 1 warning (0.00 sec)

Rows matched: 1 Changed: 1 Warnings: 1

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> exit

4. 重啟mysql服務

先將之前加在配置文件里面的2句代碼注釋或刪除掉，然后重啟mysql服務，就可以使用剛剛設置的密碼登錄了。[root@mytestlnx02 ~]# service mysql start

[root@mytestlnx02 ~]#

[root@mytestlnx02 ~]# mysql -u root -p

Enter password:

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

p.s.

在CentOS上的操作方式有所不同。

執行修改密碼的命令一直報錯mysql> update user set authentication_string=password('xxxxxxxx') where User='root';

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '('root_password') where User='root'' at line 1

不可能是語法問題，檢查了很多遍，最后發現CentOS下應該這樣操作：

查看初始密碼[root@VM_0_8_centos ~]# grep 'temporary password' /var/log/mysqld.log

2018-09-26T04:25:54.927944Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: DN34N/=?aIfZ

可以看到初始密碼為DN34N/=?aIfZ

使用初始密碼登錄[root@VM_0_8_centos ~]# mysql -u root -p

Enter password:

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

Your MySQL connection id is 8

Server version: 8.0.12 MySQL Community Server - GPL

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

修改密碼mysql> ALTER USER 'root' IDENTIFIED BY 'xxxxxxxxx';

ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'xxxxxxxx';

Query OK, 0 rows affected (0.11 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.01 sec)

mysql> exit

Bye

重啟服務就生效了[root@VM_0_8_centos ~]# service mysqld stop

Redirecting to /bin/systemctl stop mysqld.service

[root@VM_0_8_centos ~]# service mysqld start

Redirecting to /bin/systemctl start mysqld.service

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