CentOS7 Access denied for user '

   在Linux上使用MySQL就遇到了很多难题和报错，这次出现的是一个无法修改初始密码的错误；

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键盘无法键入密码；
报错信息

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

以下是我解决问题的步骤。

1、关闭mysql服务

[root@localhost mysql]# service mysqld stop
Redirecting to /bin/systemctl stop mysqld.service

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2、找到/etc/my.cnf,在最后一行添加skip-grant-tables（用于免密码登录）

vim /etc/my.cnf

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3、重启mysql服务

[root@localhost etc]# service mysqld start
Redirecting to /bin/systemctl start mysqld.service

4、正常登录mysql（不使用密码）

[root@localhost etc]# mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 8.0.20 MySQL Community Server - GPL

Copyright (c) 2000, 2020, 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> 

5、刷新权限

flush privileges

6、修改密码

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';
Query OK, 0 rows affected (0.11 sec)

mysql> flush privileges;  # 刷新权限
Query OK, 0 rows affected (0.00 sec)

7、找到/etc/my.cnf ,删除skip-grant-table

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8、重启mysql服务

[root@localhost etc]# service mysqld restart
Redirecting to /bin/systemctl restart mysqld.service

9、正常登录测试 mysql -u root -p

[root@localhost etc]# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 8.0.20 MySQL Community Server - GPL

Copyright (c) 2000, 2020, 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>