MySQL 5.7.11 重置root密码

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