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

登陸時出錯：

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

密碼忘記了（和剛安裝後不知道密碼一樣）

網上有人說mysql的密碼是空密碼，其實在mysql5.7版本之後，密碼不再是空密碼了，

如果是剛安裝的，可以在mysql的日誌檔案找到

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

補充：如果找到mysql提供的密碼，可以使用

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

直接修改mysql的密碼，但這種方法存在安全隱患，畢竟密碼在命令列上顯示了，不建議但不反對。

如果是忘記，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，並儲存退出；

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

[root@centos7 ~]# systemctl restart mysqld

2.空密碼直接進入mysql；

[root@centos7 ~]# mysql -u root -p
Enter password: (這裡是空密碼，直接回車)
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>

進入mysql庫；

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>

這裡的mysql並不是沒變，資料庫位置是變化的；

3.修改密碼：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

註釋掉 ＃skip-grant-tables

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

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

[root@centos7 ~]# systemctl restart mysqld

5.用新的密碼再進入mysql；

[root@centos7 ~]# mysql -u root -p 
Enter password: (之前演示為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,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密碼，更改root密碼： alter user 'root'@'localhost' identified by '密碼';

修改使用者密碼；

ALTER USER testuser IDENTIFIED BY '123456';

修改當前登入使用者

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，密碼的複雜度有了很大的要求；

7.修改完成後就可以繼續操作mysql了

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

以上所述是小編給大家介紹的mysql5.7密碼忘記解決方法詳解整合，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回覆大家的。在此也非常感謝大家對我們網站的支援！