详解mysql5.7密码忘记解决方法

ENV:

[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:

[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

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-resolve
skip-grant-tables
[root@centos7 ~]# systemctl restart mysqld

2.空密码直接进入mysql;

[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;

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’;

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 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;

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 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

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共享资源网网网站的支持!

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