1.vim /etc/my.cnf 打开skip-grant-tables注解保存重启mysql 执行/etc/init.d/mysqld restart
2.设置root密码为空执行以下操作
/usr/local/mysql/bin/mysql -u root -p
use mysql;
update user set authentication_string='' where user='root';
exit
3.vim /etc/my.cnf 关闭skip-grant-tables,
4.重启/etc/init.d/mysqld restart
5.免密码登录执行mysql -u root -p直接回车
6.使用 ALTER 修改 root 用户密码
ALTER user 'root'@'localhost' IDENTIFIED BY '123456';
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完成密码修改