MySQL忘记密码了怎么解决
笔者曾经有一次误删了mysqlroot用户，怎么办？
之前的解决方式是通过忽略授权表的方式重启mysql然后插入相关数据解决该问题的，但是这种方式需要重启mysql，会影响现有业务，那么有没有其他方式可以不重启MySQL就解决呢?
因为mysql的user表示MyISAM引擎的，因此我们可以通过修改对应的文件来解决这个问题。下面是本人在测试环境的一次演练，仅供参考。
一、查看现有用户
04:18:34 root@localhost [mysql]>select user,host from user;
+---------------+-----------+
| user | host |
+---------------+-----------+
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
+---------------+-----------+
3 rows in set (0,00 sec)
二、删除本地root用户
04:18:59 root@localhost [mysql]>drop user root@'localhost';
三、再次查看用户
04:20:02 root@localhost [mysql]>select user,host from user;
+---------------+-----------+
| user | host |
+---------------+-----------+
| mysql.session | localhost |
| mysql.sys | localhost |
+---------------+-----------+
现在我们开始恢复用户数据
四、移动user表相关文件
[root@localhost mysql]# cp user.* /vagrant/mysql/3307/data/test/
五、登录另一个实例并查看user表
04:23:53 root@localhost [(none)]>use test;
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
04:23:56 root@localhost [test]>show tables;
+----------------+
| Tables_in_test |
+----------------+
| user |
+----------------+
1 row in set (0,00 sec)
04:23:58 root@localhost [test]>select * from user\G
*************************** 1. row ***************************
Host: localhost
User: mysql.session
Select_priv: N
Insert_priv: N
Update_priv: N
Delete_priv: N
Create_priv: N
Drop_priv: N
Reload_priv: N
Shutdown_priv: N
Process_priv: N
File_priv: N
Grant_priv: N
References_priv: N
Index_priv: N
Alter_priv: N
Show_db_priv: N
Super_priv: Y
Create_tmp_table_priv: N
Lock_tables_priv: N
Execute_priv: N
Repl_slave_priv: N
Repl_client_priv: N
Create_view_priv: N
Show_view_priv: N
Create_routine_priv: N
Alter_routine_priv: N
Create_user_priv: N
Event_priv: N
Trigger_priv: N
Create_tablespace_priv: N
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
plugin: mysql_native_password
authentication_string: *C7A1AAE2D250AFD864050FAF4935EF6F5D185A92
password_expired: N
password_last_changed: 2018-02-23 13:19:12
password_lifetime: NULL
account_locked: Y
*************************** 2. row ***************************
Host: localhost
User: mysql.sys
Select_priv: N
Insert_priv: N
Update_priv: N
Delete_priv: N
Create_priv: N
Drop_priv: N
Reload_priv: N
Shutdown_priv: N
Process_priv: N
File_priv: N
Grant_priv: N
References_priv: N
Index_priv: N
Alter_priv: N
Show_db_priv: N
Super_priv: N
Create_tmp_table_priv: N
Lock_tables_priv: N
Execute_priv: N
Repl_slave_priv: N
Repl_client_priv: N
Create_view_priv: N
Show_view_priv: N
Create_routine_priv: N
Alter_routine_priv: N
Create_user_priv: N
Event_priv: N
Trigger_priv: N
Create_tablespace_priv: N
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
plugin: mysql_native_password
authentication_string: *C7A1AAE2D250AFD864050FAF4935EF6F5D185A92
password_expired: N
password_last_changed: 2018-02-23 13:19:26
password_lifetime: NULL
account_locked: Y
2 rows in set (0,00 sec)
六、把本实例的root用户插入刚刚移动过来的user表
04:25:03 root@localhost [test]>insert into user select * from mysql.user where user = 'root' and host ='localhost';
Query OK, 1 row affected (0,02 sec)
Records: 1 Duplicates: 0 Warnings: 0
七、再次移动user文件到原先的位置
[root@localhost test]# cp user.* /vagrant/mysql/3306/data/mysql
八、重新加载配置到内存
[root@localhost test]# kill -HUP `pidof mysqld`
通过该步mysql并不会重启，对应用不会有影响
九、重新登录，OK
[root@localhost test]# mysql -uroot -p -S /tmp/mysql3306.sock
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 13
Server version: 5.7.21-log MySQL Community Server (GPL)
Copyright (c) 2000, 2017, 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.
04:30:57 root@localhost [(none)]>
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