关于hive里安装mysql出现错误，如何删除指定的主机或用户？（解决Access denied）

　　前期博客

　　　　你可以按照我写的这篇博客去，按照hive的mysql。

1 复习ha相关 + weekend110的hive的元数据库mysql方式安装配置（完全正确配法）（CentOS版本）（包含卸载系统自带的MySQL）

　　　

　　出现如下问题

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

ERROR 1045 (28000): Access denied for user 'hive'@'master' (using password: YES)

ERROR 1045 (28000): Access denied for user 'hive'@'%' (using password: YES)

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

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

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

ERROR 1045 (28000): Access denied for user 'root'@'127.0.0.1' (using password: YES)

　　最后要达到这个目的（才可以解决问题！！！）

　　进入root用户

mysql> select user,host,password from mysql.user;

mysql> select user,host,password from mysql.user;
+------+-----------+-------------------------------------------+
| user | host | password |
+------+-----------+-------------------------------------------+
| root | localhost | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| root | master | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| hive | localhost | *4DF1D66463C18D44E3B001A8FB1BBFBEA13E27FC |
| hive | master | *4DF1D66463C18D44E3B001A8FB1BBFBEA13E27FC |
| hive | % | *4DF1D66463C18D44E3B001A8FB1BBFBEA13E27FC |
| root | % | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
+------+-----------+-------------------------------------------+

　　关键是hive用户下的这三个配置出来就好，  hive@%   hive@master    hive@localhost

　　我的这里，是root对各个主机下密码都是root。hive对各个主机密码都是hive。

或者

mysql> select user,host,password from mysql.user;
+------+-----------+-------------------------------------------+
| user | host      | password                                  |
+------+-----------+-------------------------------------------+
| root | localhost | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| root | djt11     | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| hive | localhost | *4DF1D66463C18D44E3B001A8FB1BBFBEA13E27FC |
| hive | djt11     | *4DF1D66463C18D44E3B001A8FB1BBFBEA13E27FC |
| hive | %         | *4DF1D66463C18D44E3B001A8FB1BBFBEA13E27FC |
| root | %         | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
+------+-----------+-------------------------------------------+
 rows in set (0.00 sec)

　　关键是hive用户下的这三个配置出来就好，  hive@%   hive@master    hive@localhost

　　我的这里，是root对各个主机下密码都是root。hive对各个主机密码都是hive。

　　怎么来解决问题？

　　进入root用户，执行

[root@master native]# mysql -uroot -p
Enter password:（默认是回车）

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> select host,user from user;
+-----------+------+
| host      | user |
+-----------+------+
| %         | Hive |
| %         | root |
| 127.0.0.1 | root |
| localhost |      |
| localhost | root |
| master    |      |
| master    | root |
+-----------+------+
7 rows in set (0.00 sec)

mysql> delete from user where user=' ';
Query OK, 2 rows affected (0.00 sec)

mysql> commit;
Query OK, 0 rows affected (0.00 sec)

mysql> select host,user from user;
+-----------+------+
| host      | user |
+-----------+------+
| %         | hive |
| %         | root |
| 127.0.0.1 | root |
| localhost | root |
| master    | root |
+-----------+------+
5 rows in set (0.00 sec)

mysql> delete from user where host='127.0.0.1';
Query OK, 1 row affected (0.00 sec)

mysql> delete from user where host='localhost';
Query OK, 1 row affected (0.00 sec)

mysql> commit;
Query OK, 0 rows affected (0.00 sec)

mysql> select host,user from user;
+--------+------+
| host   | user |
+--------+------+
| %      | hive |
| %      | root |
| master | root |
+--------+------+
3 rows in set (0.00 sec)

mysql> delete from user where user='hive';
Query OK, 1 row affected (0.00 sec)

mysql> select host,user from user;
+--------+------+
| host   | user |
+--------+------+
| %      | root |
| master | root |
+--------+------+
2 rows in set (0.00 sec)

mysql> grant all privileges on hive.* to hive@'%' identified by 'hive' with grant option;
Query OK, 0 rows affected (0.00 sec)

mysql> select host,user from user;
+--------+------+
| host   | user |
+--------+------+
| %      | hive |
| %      | root |
| master | root |
+--------+------+
3 rows in set (0.00 sec)

mysql> grant all privileges on hive.* to hive@'master' identified by 'hive' with grant option;
Query OK, 0 rows affected (0.00 sec)

mysql> select host,user from user;
+--------+------+
| host   | user |
+--------+------+
| %      | hive |
| %      | root |
| master | hive |
| master | root |
+--------+------+
4 rows in set (0.00 sec)

mysql> grant all privileges on hive.* to hive@'localhost' identified by 'hive' with grant option;
Query OK, 0 rows affected (0.00 sec)

mysql> select host,user from user;
+--------+------+
| host   | user |
+--------+------+
| %      | hive |
| %      | root |
| master | hive |
| master | root |

| master | localhost|

　　　　

　　进入root用户查看database的效果

[root@master native]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 5.1.61 Source distribution

Copyright (c) 2000, 2011, 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> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| hive               |
| mysql              |
| test               |
+--------------------+
4 rows in set (0.00 sec)

　　进入hive用户查看database的效果

[root@master native]# mysql -uhive -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 14
Server version: 5.1.61 Source distribution

Copyright (c) 2000, 2011, 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> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| hive               |
| test               |
+--------------------+
3 rows in set (0.00 sec)

mysql> use hive;
Database changed
mysql> show tables;
Empty set (0.00 sec)

mysql>

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