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ENV：

? 1 2 3 4 5 6 7 8 9 10 11 12 [root@centos7 ~]# uname -r 3.10.0-514.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 mysql mysql-community-common-5.7.26-1.el7.x86_64 mysql-community-client-5.7.26-1.el7.x86_64 mysql57-community-release-el7-11.noarch mysql-community-server-5.7.26-1.el7.x86_64 mysql-community-libs-5.7.26-1.el7.x86_64 mysql-community-libs-compat-5.7.26-1.el7.x86_64

登陆时出错：

? 1 2 3 [root@centos7 ~]# mysql -u root -p Enter 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

? 1 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;

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

空白位置加入，并保存退出；

? 1 2 3 4 [mysqld]       skip-name-resolve skip-grant-tables ? 1 [root@centos7 ~]# systemctl restart mysqld

2.空密码直接进入mysql；

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 [root@centos7 ~]# mysql -u root -p Enter 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 2 Server 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 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>

进入mysql库；

? 1 2 3 4 5 6 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>

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';

? 1 2 3 4 5 6 7 8 9 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

? 1 [root@centos7 ~]# vim /etc/my.cnf ? 1 2 3 4 [mysqld]       skip-name-resolve #skip-grant-tables ? 1 [root@centos7 ~]# systemctl restart mysqld

5.用新的密码再进入mysql；

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 [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 6 Server 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 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>

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；

? 1 ALTER USER testuser IDENTIFIED BY '123456';

修改当前登录用户

? 1 ALTER USER USER() IDENTIFIED BY '123456'; ? 1 2 3 4 5 6 mysql> alter user user() identified by 'Linuxpassword!@#'; ERROR 1819 (HY000): Your password does not satisfy the current policy requirements mysql> 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

? 1 2 3 4 5 6 7 8 9 10 11 12 13 mysql> show databases; +--------------------+ | Database      | +--------------------+ | information_schema | | mysql       | | performance_schema | | sys        | +--------------------+ 4 rows in set (0.00 sec)   mysql> exit Bye

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！

原文链接：https://blog.csdn.net/silent_ghost/article/details/89819511