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（和剛安裝后不知道密碼一樣）
網上有人說mysql的密碼是空密碼，其實在mysql5.7版本之后，密碼不再是空密碼了，
如果是剛安裝的，可以在mysql的日志文件找到
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，畢竟密碼在命令行上顯示了，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，并保存退出；
[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: (這里是空密碼，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>
這里的mysql并不是沒變，數據庫位置是變化的；
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
注釋掉 ＃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, 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密碼，更改root密碼： alter user 'root'@'localhost' identified by '密碼';
修改用戶密碼；
ALTER USER testuser IDENTIFIED BY '123456';
修改當前登錄用戶
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，密碼的復雜度有了很大的要求；
7.修改完成后就可以繼續操作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，小編會及時回復大家的。在此也非常感謝大家對腳本之家網站的支持！
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