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MySQL忘记/无root密码，强制修改root密码_mysql无root密码登录后设置密码-CSDN博客

sudo vi /etc/mysql/my.cnf

添加如下内容：

[mysqld]
skip-grant-tables

sudo service mysql restart

mysql -u root -p

use mysql;
update mysql.user set authentication_string='' where user="root" and host="localhost";
flush privileges;
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';
exit;

将my.cnf的‘skip-grant-tables’注释掉或删掉，注释方法为在语句开头加上‘#’

mysql -u root -p

输入密码  root