463.comMySQL 5.7忘记root密码后修改的详细教程

数据库版本: 5.7.18 MySQL Community Server (GPL)

mysql show variables like 'default_password_lifetime';+---------------------------+-------+| Variable_name | Value |+---------------------------+-------+| default_password_lifetime | 0 |+---------------------------+-------+1 row in set (0.00 sec) mysql

忘记密码,输入错误的密码时遇到下面错误信息:

然后启动MySQL,进入MySQL后,修改root密码,操作过程中遇到ERROR 1054 (42S22): Unknown column 'password' in 'field list',查了一下user表的表结构,发现原来MySQL
5.7下,user表已经没有Password字段。加密后的用户密码存储于authentication_string字段。

具体情况如下所示:

  1. 使用 mysql_install_db
    初始化时,默认会自动生成随机密码,随机密码放在/var/log/mysqld.log中,并且不创建除
    root@localhost和mysql.sys@localhost 外的其他账号,也不创建 test 库;

    [root@mytestlnx02 mysql]# yum localinstall mysql-community-{server,client,common,libs}-* [root@mytestlnx02 mysql]# rpm -qa | grep -i mysqlmysql-community-client-5.7.18-1.el6.i686mysql-community-libs-5.7.18-1.el6.i686perl-DBD-MySQL-4.013-3.el6.x86_64mysql-community-server-5.7.18-1.el6.i686mysql-community-common-5.7.18-1.el6.i686mysql-community-libs-compat-5.7.18-1.el6.i686[root@mytestlnx02 mysql]# service mysqld start Initializing MySQL database: [ OK ]Installing validate password plugin: [ OK ]Starting mysqld: [ OK ][root@mytestlnx02 mysql]# [root@mytestlnx02 mysql]# grep ‘temporary password’ /var/log/mysqld.log2017-05-05T06:10:57.802143Z 1 [Note] A temporary password is generated for root@localhost: w99s(m-q_ML: mysql select user ,host from user;+———–+———–+| user | host |+———–+———–+| mysql.sys | localhost || root | localhost |+———–+———–+2 rows in set (0.00 sec)

总结

[root@mytestlnx02 ~]# service mysqld startStarting mysqld: [ OK ][root@mytestlnx02 ~]# mysql -u root Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 4Server version: 5.7.18 MySQL Community Server (GPL) Copyright (c) 2000, 2017, 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 use mysql;Reading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -A Database changedmysql update user set password=PASSWORD('Kd8k&dfdl023') - where user='root';ERROR 1054 (42S22): Unknown column 'password' in 'field list'mysql update mysql.user set authentication_string=password('Kd8k&dfdl023') where user='root';Query OK, 1 row affected, 1 warning (0.00 sec)Rows matched: 1 Changed: 1 Warnings: 1 mysql flush privileges;Query OK, 0 rows affected (0.00 sec) mysql exit

3:增加了密码安全等级以及密码复杂度设置。参数如下:

案例环境如下:

  1. 用户表 mysql.user 的 plugin字段不允许为空, 默认值是
    mysql_native_password,而不是
    mysql_old_463.com,password,不再支持旧密码格式;
[root@mytestlnx02 ~]# mysql -u root -pEnter password: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)[root@mytestlnx02 ~]#
mysql show variables like 'validate_password%';+--------------------------------------+--------+| Variable_name | Value |+--------------------------------------+--------+| validate_password_check_user_name | OFF || validate_password_dictionary_file | || validate_password_length | 8 || validate_password_mixed_case_count | 1 || validate_password_number_count | 1 || validate_password_policy | MEDIUM || validate_password_special_char_count | 1 |+--------------------------------------+--------+7 rows in set (0.00 sec)

检查MySQL服务是否启动,如果启动,关闭MySQL服务

[root@mytestlnx02 ~]# service mysqld startStarting mysqld: [ OK ][root@mytestlnx02 ~]# mysql -u root -pEnter password: Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 4Server version: 5.7.18 Copyright (c) 2000, 2017, 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 use mysql;ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.mysql set password=password('Kd8k&dfdl023');Query OK, 0 rows affected, 1 warning (0.00 sec)
[mysqld] skip-grant-tables 

以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对脚本之家的支持。

一直以来,MySQL的应用和学习环境都是MySQL
5.6和之前的版本,也没有去关注新版本MySQL
5.7的变化和新特性。今天帮人处理忘记root密码的时时候,发现以前的方法不奏效了。

操作系统 : Red Hat Enterprise Linux Server release 6.6 (Santiago)

[root@mytestlnx02 ~]# ps -ef | grep -i mysqlroot 22972 1 0 14:18 pts/0 00:00:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --socket=/var/lib/mysql/mysql.sock --pid-file=/var/run/mysqld/mysqld.pid --basedir=/usr --user=mysqlmysql 23166 22972 0 14:18 pts/0 00:00:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sockroot 23237 21825 0 14:22 pts/0 00:00:00 grep -i mysql[root@mytestlnx02 ~]# service mysqld stopStopping mysqld: [ OK ][root@mytestlnx02 ~]# 

前言

2.
增加密码过期机制,过期后需要修改密码,否则可能会被禁用,或者进入沙箱模式;
是否启用密码过期由参数default_password_lifetime控制。

找到MySQL的my.cnf配置文件,在/etc/my.cnf
(有些版本是/etc/mysql/my.cnf)在里面增加下面一段信息:

后面查询了一下相关资料,发现MySQL 5.7在安全方面有下一些新特性。

在my.cnf文件中,把刚才加入的那一行“skip-grant-tables”注释或删除掉。
然后重启MySQL服务后需要执行命令set password=password('newpassword');后,问题搞定。

具体操作过程如下所示:

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