MySQL的root密码忘记或丢失的解决方法一例

2022-08-03 16:45:23

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-bash-4.2$ service mysql status
SUCCESS! MySQL running (2670)
-bash-4.2$ mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

以下是密码忘记的解决方法:

修改MySQL的参数设置：
# vi /etc/my.cnf
在[mysqld]的段最后一行加上一句：skip-grant-tables
例如：
[mysqld]
........................
log-bin=mysql-bin
innodb_data_file_path = ibdata1:12M;ibdata2:100M;ibdata3:300M:autoextend
innodb_file_per_table=on
max_connections=500
skip-grant-tables    --新增加行
保存并且退出vi.

重启MySQL服务:
[root@chenfeng subsys]# service mysql restart
Shutting down MySQL. SUCCESS!
Starting MySQL. SUCCESS!

-bash-4.2$ mysql    --不用输密码直接登录
Welcome to the MariaDB monitor. Commands end with ; or /g.
Your MySQL connection id is 2
Server version: 5.6.15-log Source distribution

Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.

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

MySQL [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| chenfeng           |
| mysql              |
| performance_schema |
| test               |
+--------------------+
5 rows in set (0.00 sec)

MySQL [(none)]> 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 [mysql]> UPDATE user SET Password = password ('12345678') WHERE User ='root';   --修改为新密码12345678
Query OK, 4 rows affected (0.00 sec)
Rows matched: 4 Changed: 4 Warnings: 0

MySQL [mysql]>
MySQL [mysql]> flush privileges;   --刷新一下权限表
Query OK, 0 rows affected (0.00 sec)

MySQL [mysql]> quit
Bye

将MySQL的参数设置修改回来:
# vi /etc/my.cnf
将刚才在[mysqld]的段中最后一行加上的skip-grant-tables删除,然后保存退出。

重启MySQL服务:
[root@chenfeng subsys]# service mysql restart
Shutting down MySQL. SUCCESS!
Starting MySQL. SUCCESS!

重新用新密码登录:
-bash-4.2$ mysql -u root -p12345678      --12345678为新密码
Welcome to the MariaDB monitor. Commands end with ; or /g.
Your MySQL connection id is 7
Server version: 5.6.15-log Source distribution

Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.

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

MySQL [(none)]> 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 [mysql]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| chenfeng           |
| mysql              |
| performance_schema |
| test               |
+--------------------+
5 rows in set (0.00 sec)

MySQL [mysql]>

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