Mysql 密码忘记如何修改密码
Linux服务器，把mysql数据库密码忘记了。
[root@VM_0_13_centos ~]# mysql -uroot -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
密码忘了登陆不了MySQL了。
1、首先停止mysql服务进程：
service mysqld stop
然后编辑mysql的配置文件my.cnf（目的是跳过密码验证）
vim /etc/my.cnf
在最后面添加一段代码
skip-grant-tables ##忽略mysql权限问题，直接登录
然后保存 :wq!退出
2.重启service mysqld start 服务进程
[root@VM_0_13_centos my.cnf.d]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.22 MySQL Community Server (GPL)
Copyright (c) 2000, 2018, 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> show database
使用mysql表，然后进行修改mysql的root密码：
mysql> use mysql; ##使用mysql数据库
2 Reading table information for completion of table and column names
3 You can turn off this feature to get a quicker startup with -A
4
5 Database changed
6 mysql> update user set password=password("123456") where user="root";##更新密码（）
7 Query OK, 4 rows affected (0.00 sec)
8 Rows matched: 4 Changed: 4 Warnings: 0
9
10 mysql> flush privileges;##刷新权限
11 Query OK, 0 rows affected (0.00 sec)
注意：我在更新的时候发现user表提示没有password 这一栏，原来是我这个版本这个栏位更新成新名字：authentication_string
update user set authentication_string=password("123456") where user="root"
-> ;
Query OK, 2 rows affected, 1 warning (0.00 sec)
Rows matched: 2 Changed: 2 Warnings: 1
3.切回配置文件中将添加的那一行删除就可以了。vim /etc/my.cnf
4.重启数据库服务。
[root@VM_0_13_centos etc]# mysql
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
此时，可以发现已经不能登录了。
[root@VM_0_13_centos etc]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 18
Server version: 5.7.22 MySQL Community Server (GPL)
Copyright (c) 2000, 2018, 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>
原文地址https://blog.csdn.net/weixin_39316363/article/details/81269626
