1.修改/etc/my.conf，添加参数skip-grant-tables

2.重启mysql

service mysqld stop

service mysqld start

3.用root 直接登录

[root@bogon ~]# mysql -uroot

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 4

Server version: 5.7.11 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

4.修改密码

mysql> alter user 'root'@'localhost' identified by 'newpassword';

ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement

mysql>

这种方式不好使，换一种方式：

mysql> use mysql

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> update user set authentication_string=PASSWORD('newpassword') where User='root';

Query OK, 1 row affected, 1 warning (0.07 sec)

Rows matched: 1  Changed: 1  Warnings: 1

mysql>

5.将/ect/my.conf 修改回来，重启mysql 测试新密码

[root@bogon ~]# service mysqld stop

Stopping mysqld:                                           [  OK  ]

[root@bogon ~]# service mysqld start

Starting mysqld:                                           [  OK  ]

[root@bogon ~]# mysql -uroot -p

Enter password:

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 3

Server version: 5.7.11 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

修改完成