修改MySQL root密码。

此方法将密码暴露到命令行历史记录中，这些命令应该以root身份运行。

通过mysql命令行工具登录: Mysql -uroot -poldpassword 执行如下命令: SET PASSWORD FOR root@ localhost = PASSWORD('newpassword');

or

运行此命令，为当前用户设置密码(在本例中为'root'): SET PASSWORD = PASSWORD('newpassword');

停止MySQL Sudo service mysql stop 制作MySQL服务目录。 Sudo mkdir /var/run/mysqld 赋予MySQL用户写入服务目录的权限。 Sudo chown mysql: /var/run/mysqld 手动启动MySQL，不需要权限检查或联网。 Sudo mysqld_safe—skip-grant-tables—skip-networking &

5.无需密码登录。 Mysql -uroot Mysql

6.更新root用户密码。

更新mysql。user SET authentication_string=PASSWORD('YOURNEWPASSWORD')， plugin='mysql_native_password' WHERE user ='root' AND Host='%'; 退出;

关闭MySQL。 sudo mysqladmin -S /var/run/mysqld/mysqld.袜子关闭 正常启动MySQL服务。 Sudo服务mysql启动

在我的例子中，这个选项很有用:https://stackoverflow.com/a/49610152/13760371 谢谢你，拉胡尔。

除了下面的时刻，当我尝试输入命令:

UPDATE mysql.user SET authentication_string=PASSWORD('YOURNEWPASSWORD'), plugin='mysql_native_password' WHERE User='root' AND Host='%';

控制台发出警告:

1681 'password' is deprecated and will be removed in a future release

用这个命令治愈:

UPDATE mysql.user SET authentication_string=CONCAT('*', UPPER(SHA1(UNHEX(SHA1('NEWPASSWORD'))))), plugin='mysql_native_password' WHERE User='root' AND Host='localhost';

MySQL版本5.7.X

我的版本:

1. > sudo service mysql stop
2. > sudo mkdir /var/run/mysqld
3. > sudo chown mysql: /var/run/mysqld
4. > sudo mysqld_safe --skip-grant-tables --skip-networking &
5. > mysql -uroot mysql
6. > UPDATE mysql.user SET authentication_string=CONCAT('*', UPPER(SHA1(UNHEX(SHA1('NEWPASSWORD'))))), plugin='mysql_native_password' WHERE User='root' AND Host='localhost';
7. > \q;
8. > sudo mysqladmin -S /var/run/mysqld/mysqld.sock shutdown
9. > sudo service mysql start

该任务指导用户在Ubuntu操作系统下设置/修改/重置MySQL root密码。在终端中输入以下行。

停止MySQL服务器:sudo /etc/init.d / mysql停止 (在某些情况下，如果/var/run/mysqld不存在，你必须首先创建它:sudo mkdir -v /var/run/mysqld && sudo chown mysql /var/run/mysqld 启动mysqld配置:sudo mysqld——skip-grant-tables & 以root身份登录MySQL: MySQL -u root MySQL 用你的新密码替换YOURNEWPASSWORD:

MySQL < 8.0

UPDATE mysql.user SET Password = PASSWORD('YOURNEWPASSWORD') WHERE User = 'root';
FLUSH PRIVILEGES;

如果你的MySQL使用新的认证插件，你将需要使用:update user set plugin="mysql_native_password" where user ='root';在冲洗特权之前。

注意:在某些版本，如果密码列不存在，你可能想尝试: UPDATE user SET authentication_string=password('YOURNEWPASSWORD') WHERE user='root';

注意:这种方法不是最安全的重置密码的方法，但它是有效的。

对于MySQL >= 8.0

FLUSH PRIVILEGES;
ALTER USER 'root'@'localhost' IDENTIFIED BY 'YOURNEWPASSWORD';
FLUSH PRIVILEGES;

最后一步:

正如@lambart的评论中所提到的，你可能需要杀死你启动的临时无密码mysql进程，即sudo killall -9 mysqld，然后启动正常的守护进程:sudo service mysql start

引用:

该任务指导用户在Ubuntu Linux下设置/修改/重置MySQL root密码 如何重置Root用户密码(v5.6) 如何重置Root用户密码(v8.0)

正如mysql文档中password()函数所说:

此函数在MySQL 8.0.11中被移除。

这将使mysql v8.0.11及更新版本的所有现有答案都失效。

根据mysql文档，重置root密码的新通用方法如下:

The preceding sections provide password-resetting instructions specifically for Windows and Unix and Unix-like systems. Alternatively, on any platform, you can reset the password using the mysql client (but this approach is less secure): Stop the MySQL server if necessary, then restart it with the --skip-grant-tables option. This enables anyone to connect without a password and with all privileges, and disables account-management statements such as ALTER USER and SET PASSWORD. Because this is insecure, if the server is started with the --skip-grant-tables option, it enables --skip-networking automatically to prevent remote connections. Connect to the MySQL server using the mysql client; no password is necessary because the server was started with --skip-grant-tables: shell> mysql In the mysql client, tell the server to reload the grant tables so that account-management statements work: mysql> FLUSH PRIVILEGES; Then change the 'root'@'localhost' account password. Replace the password with the password that you want to use. To change the password for a root account with a different host name part, modify the instructions to use that host name. mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass'; You should now be able to connect to the MySQL server as root using the new password. Stop the server and restart it normally (without the --skip-grant-tables and --skip-networking options).

该解决方案属于以前版本的MySQL。 通过使用套接字身份验证登录MySQL，您可以做到这一点。

sudo mysql -u root

然后可以运行以下命令。

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';

详情请点击这里。