更改密码后无法登录 mysql 5.7.9

Question

我已经安装了 Mysql Ver 14.14 Distrib 5.7.9，用于 Linux (x86_64) 使用 EditLine wrapper 在 CentOS Linux 版本 7.1.1503

我使用此命令更改了 root 密码：

alter user 'root'@'localhost' identified by 'XXXXXXX';  
flush privileges;

重新登录后

[root@server ~]# mysql -u root -p
Enter password:

ERROR 1524 (HY000): Plugin '*A6074285732753D325C55AD74E7517CF442C1A81' is not loaded

Answer 1

您应该在 mysql 用户 table 上更新任何用户，尤其是 root。

您应该按照以下步骤重置它：

How to reset the root password for mysql:
Stop mysql:
1. service mysql stop

Run mysql with skip grants to be able to login without any password
2. mysqld_safe --skip-grant-tables &

Login as root
3. mysql -u root

4. mysql commands:
mysql> use mysql;
mysql> update user set password=PASSWORD("YourPWHere") where User='root';
mysql> flush privileges;
mysql> quit

Stop mysql
5. service mysql stop

Start mysql normally:
6. service mysql start

Try to login using your new password:
7. mysql -u root -p

更新：

显然此方法不适用于 5.7，请参考 Here and Here。

Answer 2

自早期版本 mySQL（我使用的是 5.7.10）以来，有两件事发生了变化：

systemd 现在用于照顾 mySQL 而不是 mysqld_safe （这就是为什么我收到 -bash: mysqld_safe: command not found 错误 - 它不是安装)
user table 结构已更改。

所以要重置 root 密码，您仍然使用 --skip-grant-tables 选项开始 mySQL 并更新 user table，但是您的操作方式已经改变。

1. Stop mysql:
systemctl stop mysqld

2. Set the mySQL environment option 
systemctl set-environment MYSQLD_OPTS="--skip-grant-tables"

3. Start mysql usig the options you just set
systemctl start mysqld

4. Login as root
mysql -u root

5. Update the root user password with these mysql commands
mysql> UPDATE mysql.user SET authentication_string = PASSWORD('MyNewPassword')
    -> WHERE User = 'root' AND Host = 'localhost';
mysql> FLUSH PRIVILEGES;
mysql> quit

6. Stop mysql
systemctl stop mysqld

7. Unset the mySQL envitroment option so it starts normally next time
systemctl unset-environment MYSQLD_OPTS

8. Start mysql normally:
systemctl start mysqld

Try to login using your new password:
7. mysql -u root -p

参考

如 http://dev.mysql.com/doc/refman/5.7/en/mysqld-safe.html、

所述

Note

As of MySQL 5.7.6, for MySQL installation using an RPM distribution, server startup and shutdown is managed by systemd on several Linux platforms. On these platforms, mysqld_safe is no longer installed because it is unnecessary. For more information, see Section 2.5.10, “Managing MySQL Server with systemd”.

它会将您带到 http://dev.mysql.com/doc/refman/5.7/en/server-management-using-systemd.html，它在页面底部提到了 systemctl set-environment MYSQLD_OPTS=。

密码重置命令位于 http://dev.mysql.com/doc/refman/5.7/en/resetting-permissions.html

的底部

Answer 3

使用以下步骤重置密码。

$ sudo systemctl start mysqld

重置 MySql 服务器 root 密码。

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

输出类似-:

     10.744785Z 1 [Note] A temporary password is generated for root@localhost: o!5y,oJGALQa

在重置 mysql_secure_installation 过程中使用上述密码。

   $ sudo mysql_secure_installation
       Securing the MySQL server deployment.

       Enter password for user root:

您已成功重置 MySql 服务器的 root 密码。使用以下命令检查 mysql 服务器是否连接。

$ mysql -u root -p

看我的文章：Install Latest MySQL 5.7 on RHEL/Centos 7

更改密码后无法登录 mysql 5.7.9

Can not login to mysql 5.7.9 after change password

mysql

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