mysql重置密码和mysql error 1044(42000)错误

#mysql错误：（密码不正确，需要重置密码）

 ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

#编辑配置文件

[root@m1 mysql]# vi /roobo/server/mysql/my.cnf

[mysqld]

skip-grant-tables

#修改完后重启服务

[root@m1 mysql]# /etc/init.d/mysqld restart

#登录数据库

[root@m1 mysql]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.24-log Source distribution

Copyright (c) 2000, 2015, 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>

mysql> use mysql;
mysql> update user set password=password("你的新密码") where user="root";
mysql> flush privileges;
mysql> quit

#再把vi my.cnf 配置文件中下面参数删除。

[mysqld]

skip-grant-tables

#修改完后重启服务

[root@m1 mysql]# /etc/init.d/mysqld restart

#再用设置的密码登录

mysql -uroot -p

passwd:******

---

mysql error 1044(42000)错误

[root@m1 ~]# mysql -uroot -p
Enter password:
ERROR 1049 (42000): Unknown database '127.0.0.1'
[root@m1 ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 18
Server version: 5.6.24-log Source distribution

Copyright (c) 2000, 2015, 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.

#授权

mysql> grant all on work.* to work@'192.168.1.4' identified by 'juan3652014';
ERROR 1044 (42000): Access denied for user 'root'@'localhost' to database 'work'

原因：  授权需要WITH GRANT OPTION 才能授权，否则会报。

mysql> show grants for root@'localhost';
+----------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost |
+----------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*F109C974766912D490ECD7E3C8754542FC773A49' |
| GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION 
+----------------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)

解决方法：

#登录mysql

mysql -uroot -p -h 127.0.0.1

mysql> use mysql
Database changed
mysql> select user,host from user;
+--------+-------------+
| user | host |
+--------+-------------+
| root | 127.0.0.1 |
| rep | 192.168.1.% |
| work | 192.168.1.4 |
| root | localhost |
| zabbix | localhost |
+--------+-------------+
5 rows in set (0.00 sec)

#授权成功
grant all on work.* to work@'192.168.1.4' identified by 'juan3652014';
flush privileges;

如上所示，root@localhost账号没有WITH GRANT OPTION选项，关于WITH GRANT OPTION选项，如果想让授权的用户，也可以将这些权限授予给其他用户，需要选项 “WITH GRANT OPTION“ 。也就是说有这个选项就可以将权限传递给第三方。这也是上面root@localhost用户给其它用后授权报错的原因，如果以 root@127.0.0.1登录（此账号拥有WITHGRANT OPTION选项），创建用户并授权就不会有这个错误。