What should I do if I forget to change mysql password on Linux?

Solution: 1. In my.cnf, add "[mysqld]" and "skip-grant-tables" 2 lines of code to skip password verification when logging in; 2. Start the mysql service, And log in to mysql; 3. Connect to the mysql database and use the UPDATE command to modify the user password.

(Recommended tutorial: mysql video tutorial)

Solution to the problem of forgetting to change mysql password on Linux Method

Change password

1. Check whether the mysql service is started. If it is, Close the mysql service

//查看mysql服务状态
[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

//关闭服务
[root@mytestlnx02 ~]# service mysql stop
[root@mytestlnx02 ~]#

2. Modify the configuration file of mysqlmy.cnf

my.cnfThe location of the configuration file is usually in /etc/my.cnf, some versions are in /etc/mysql/my.cnf

In the configuration file, add 2 lines of code

[mysqld]

skip-grant-tables

The function is to skip password verification when logging in to mysql

and then start mysqlService and enter 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. Change the password

Connect to the mysql database and change the user password

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. RestartmysqlService

First comment or delete the 2 lines of code previously added to the configuration file, and then restartmysql service, you can log in using the password you just set.

[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.

operates differently on CentOS.

Execution of the command to change the password keeps reporting errors

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

It can’t be a syntax problem. I checked it many times and finally found that CentOS should be done like this:

View the initial password

[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

You can see that the initial password is DN34N/=?aIfZ

Use the initial password to log in

[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.

Change password

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

Restart the service and it will take effect

[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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