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(shí)跳過(guò)密碼驗(yàn)證；2、啟動(dòng)mysql服務(wù)，并登錄mysql；3、連接mysql數(shù)據(jù)庫(kù)，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(wù)是否啟動(dòng)，如果啟動(dòng)，關(guān)閉mysql服務(wù)//查看mysql服務(wù)狀態(tài)

[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(guān)閉服務(wù)

[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(shí)候跳過(guò)密碼驗(yàn)證

然后啟動(dòng)mysql服務(wù)，并進(jìn)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(gè)數(shù)據(jù)庫(kù)，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(wù)

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(wù)，就可以使用剛剛設(shè)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(zhí)行修改密碼的命令一直報(bào)錯(cuò)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(yǔ)法問(wèn)題，檢查了很多遍，最后發(fā)現(xiàn)CentOS下應(yīng)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(wù)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

創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎(jiǎng)勵(lì)來(lái)咯，堅(jiān)持創(chuàng)作打卡瓜分現(xiàn)金大獎(jiǎng)

總結(jié)

以上是生活随笔為你收集整理的mysql linux改密码忘记了怎么办_linux上mysql改密码忘了怎么办？的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。