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。
（推薦教程：mysql視頻教程）
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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