mysql - 如何在 CentOS7 上更改 MySQL root 帐户密码？

Question

我在 Centos7 虚拟机上安装了 mySQL，但我在使用 root 登录时遇到了问题。我尝试在没有密码的情况下登录或尝试任何默认的(如 mysql、admin 等)我查看了 my.cnf 文件并且没有密码。我尝试通过停止服务并使用 mysqld_safe --skip-grant-tables & 重新启动它来更改密码，但我得到了 mysqld_safe:command not found 我不知道还能做什么。任何提示/想法将不胜感激!

Answer 1

您使用的是什么版本的 MySQL？我正在使用 5.7.10 并且以 root 身份登录时遇到了同样的问题

有两个问题:无法以root身份登录，无法使用mysqld_safe启动MySQL重置root 密码。

我无法在安装过程中设置 root 密码，但这是重置 root 密码的方法

编辑安装时的初始root密码可以通过运行找到

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

http://dev.mysql.com/doc/refman/5.7/en/linux-installation-yum-repo.html

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1. systemd 现在用于管理 mySQL 而不是 mysqld_safe (这就是为什么你得到 -bash: mysqld_safe: command not found 错误 - 未安装)

2. user 表结构已更改。

所以要重置 root 密码，您仍然使用 --skip-grant-tables 选项启动 mySQL 并更新 user 表，但是您的操作方式已经改变.

1. Stop mysql:
sudo systemctl stop mysqld

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

3. Start mysql usig the options you just set
sudo 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

*** Edit ***
As mentioned my shokulei in the comments, for 5.7.6 and later, you should use 
   mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass';
Or you'll get a warning

6. Stop mysql
sudo systemctl stop mysqld

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

8. Start mysql normally:
sudo systemctl start mysqld

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

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引用

正如 http://dev.mysql.com/doc/refman/5.7/en/mysqld-safe.html 所说,

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”.

这会将您带到 http://dev.mysql.com/doc/refman/5.7/en/server-management-using-systemd.html它在页面底部提到 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