liunx忘记用户密码

 1.vim /etc/my.cnf
 [mysqld]
 skip-grant-tables     ##追加此行，跳过权限表，

 2.重启mysql
 systemctl restart mysqld

 3.mysql 登陆mysql
 mysql> use mysql;
 mysql> UPDATE user SET Password = password ( 'zha123456' ) WHERE User = 'root' ;
 mysql> flush privileges ;
 mysql> quit

 4.恢复配置文件my.cnf
 vim /etc/my.cnf
 [mysqld]
 skip-grant-tables     ##去掉此行，继续校验权限表，

 5.重启mysql
 systemctl restart mysqld