详解mysql5.7密码忘记解决方法

ENV：

[root@centos7 ~]# uname -r3.10.0-514.el7.x86_64[root@centos7 ~]# cat /etc/redhat-release CentOS Linux release 7.3.1611 (Core) [root@centos7 ~]# rpm -qa mysql[root@centos7 ~]# rpm -qa |grep mysqlmysql-community-common-5.7.26-1.el7.x86_64mysql-community-client-5.7.26-1.el7.x86_64mysql57-community-release-el7-11.noarchmysql-community-server-5.7.26-1.el7.x86_64mysql-community-libs-5.7.26-1.el7.x86_64mysql-community-libs-compat-5.7.26-1.el7.x86_64

登陆时出错：

[root@centos7 ~]# mysql -u root -pEnter password: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

密码忘记了（和刚安装后不知道密码一样）

网上有人说mysql的密码是空密码，其实在mysql5.7版本之后，密码不再是空密码了，

如果是刚安装的，可以在mysql的日志文件找到

grep 'temporary password' /var/log/mysqld.log

补充：如果找到mysql提供的密码，可以使用

mysqladmin -u root -p 'mysql提供的密码' password '自己的新密码'

直接修改mysql的密码，但这种方法存在安全隐患，毕竟密码在命令行上显示了，不建议但不反对。

如果是忘记，修改如下：

1.修改 /etc/my.cnf,加入 skip-grant-tables;

[root@centos7 ~]# vim /etc/my.cnf

空白位置加入，并保存退出；

[mysqld]     skip-name-resolveskip-grant-tables

[root@centos7 ~]# systemctl restart mysqld

2.空密码直接进入mysql；

[root@centos7 ~]# mysql -u root -pEnter password: (这里是空密码，直接回车)Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 2Server version: 5.7.26 MySQL Community Server (GPL) Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>

进入mysql库；

mysql> use mysqlReading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -A Database changedmysql>

这里的mysql并不是没变，数据库位置是变化的；

3.修改密码：UPDATE user SET authentication_string=PASSWORD('newpassword') where USER='root';

mysql> UPDATE user SET authentication_string=PASSWORD('newpassword') where USER='root';Query OK, 1 row affected, 1 warning (0.00 sec)Rows matched: 1 Changed: 1 Warnings: 1 mysql> mysql> FLUSH PRIVILEGES;Query OK, 0 rows affected (0.00 sec) mysql>

4改回/etc/my.cnf

注释掉 ＃skip-grant-tables

[root@centos7 ~]# vim /etc/my.cnf

[mysqld]     skip-name-resolve#skip-grant-tables

[root@centos7 ~]# systemctl restart mysqld

5.用新的密码再进入mysql；

[root@centos7 ~]# mysql -u root -p Enter password: (之前演示为newpassword)Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 6Server version: 5.7.26 Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>

6.更改root密码，更改root密码： alter user 'root'@'localhost' identified by '密码';

修改用户密码；

ALTER USER testuser IDENTIFIED BY '123456';

修改当前登录用户

ALTER USER USER() IDENTIFIED BY '123456';

mysql> alter user user() identified by 'Linuxpassword!@#';ERROR 1819 (HY000): Your password does not satisfy the current policy requirementsmysql> alter user user() identified by 'LINUX123password!@#';Query OK, 0 rows affected (0.00 sec) mysql> 

可以看出，密码的复杂度有了很大的要求；

7.修改完成后就可以继续操作mysql了

mysql> show databases;+--------------------+| Database      |+--------------------+| information_schema || mysql       || performance_schema || sys        |+--------------------+4 rows in set (0.00 sec) mysql> exitBye

以上所述是小编给大家介绍的mysql5.7密码忘记解决方法详解整合，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！