當我登陸MySQL時，發現報錯
[root@localhost ~]# mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user ‘root’@‘localhost’ (using password: YES)
說明密碼錯誤，此時我們可以通過重置密碼解決。
1.跳過MySQL的密碼認證過程
[root@localhost ~]# vi /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
[mysqld]
......
skip-grant-tables #添加此行命令用來跳過驗證
......
# 保存並退出
2.重啓MySQL
[root@localhost ~]# systemctl restart mysqld
3.重啓之後輸入mysql進入
[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.14 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, 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>
4.修改root的密碼
[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.14 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, 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> 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 user set authentication_string=password("Admin@123") where user="root";
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 1
如果此處更改密碼報錯ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement 則需要執行flush privileges後再次更改。
重啓服務並使用新密碼登陸
[root@localhost ~]# systemctl restart mysqld
[root@localhost ~]# mysql -uroot -pAdmin@123
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.14 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, 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>
刪除之前在my.cnf中添加的內容。重啓服務，完成更改。
如果在使用該數據庫時報錯
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
此時需要重新更改密碼，不過需要使用alter方式
alter user 'root'@'localhost' identified by 'youpassword';