1. Modify the configuration file my.cnf, add skip-grant-tables under the configuration file [mysqld], restart the MySQL service to log in without password
The --skip-grant-tables option means to skip the authorization table authentication when starting the MySQL service. After startup, the root connecting to MySQL will not require a password (dangerous).
[mysqld]
skip-grant-tables
2. Connect to MySQL with a root user with a blank password, and change the root password:
[root@iZ235wguph2Z www]# mysql -u root
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 295
Server version: 5.0.56-log Source distribution
Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> update user set password=password('123456') where User='root';
ERROR 1046 (3D000): No database selected
mysql> use mysql;
Database changed
mysql> update user set password=password('123456') where User='root';
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3 Changed: 3 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> exit3. Go to my.cnf and delete the skip-grant-tables option, and then restart the MySQL service.
At this point, the password of the root user of the MySQL database has been modified.
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