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

一、问题描述

因为误用快捷键导致mysql退出，再次登录时显示错误：ERROR 1045 (28000): Access denied for user ‘root’@‘localhost’ (using password: YES)

二、问题解决过程

1.打开/etc/mysql/mysql.conf.d/mysqld.cnf 文件,命令如下

$ sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf

2.找到[mysqld]段，并加入一行“skip-grant-tables”

3.重启mysql服务,用空密码进入mysql管理命令行，切换到mysql库,操作命令如下，

$ mysql
Welcome to the MySQL monitor. Commands end with ; or \g. 
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('newpass') where user='root' and Host ='localhost';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 1
mysql> update user set plugin="mysql_native_password"; 
Query OK, 0 rows affected (0.00 sec)
Rows matched: 3 Changed: 0 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
mysql> quit;
Bye

4.回到sudo vi /etc/mysql/mysql.conf.d/mysqld.cnf，把刚才加入的那一行“skip-grant-tables”注释或删除掉。

5.再次重启mysql服务sudo service mysql restart，使用新的密码登陆，修改成功。

$ mysql -u root -p new_pass 
Welcome to the MySQL monitor. Commands end with ; or \g. 
mysql>