在CentOS上MySQL数据库服务器配置方法

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[root@sample ~]# mysql -u root -p  ← 通过密码用root登录
Enter password:  
← 在这里输入密码

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 9 to server version: 4.1.20

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> grant all privileges on test.* to centospub@localhost identified by '在这里定义密码';  ← 建立对test数据库有完全操作权限的名为centospub的用户
Query OK, 0 rows affected (0.03 sec)

mysql> select user from mysql.user where user='centospub';  ← 确认centospub用户的存在与否
+---------+
| user  |
+---------+
| centospub |  ← 确认centospub已经被建立
+---------+
1 row in set (0.01 sec)

mysql> exit  ← 退出MySQL服务器
Bye

[root@sample ~]# mysql -u centospub -p  ← 用新建立的centospub用户登录MySQL服务器
Enter password:  ← 在这里输入密码

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 10 to server version: 4.1.20

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> create database test;  ← 建立名为test的数据库
Query OK, 1 row affected (0.00 sec)

mysql> show databases;  ← 查看系统已存在的数据库
+-------------+
| Database |
+-------------+
| test    |
+-------------+
1 row in set (0.00 sec)

mysql> use test  ← 连接到数据库
Database changed

mysql> create table test(num int, name varchar(50));  ← 在数据库中建立表
Query OK, 0 rows affected (0.03 sec)

mysql> show tables;  ← 查看数据库中已存在的表
+-------------------+
| Tables_in_test |
+-------------------+
| test     |
+-------------------+
1 row in set (0.01 sec)

mysql> insert into test values(1,'Hello World!');  ← 插入一个值到表中
Query OK, 1 row affected (0.02 sec)

mysql> select * from test;  ← 查看数据库中的表的信息
+------+-------------------+
| num | name      |
+------+-------------------+
| 1   | Hello World!  |
+------+-------------------+
1 row in set (0.00 sec)

mysql> update test set name='Hello Everyone!';  ← 更新表的信息,赋予新的值
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0

mysql> select * from test;  ← 查看数据库中的表的信息
+------+----------------------+
| num | name      |
+------+----------------------+
| 1   | Hello Everyone! |  ← 确认被更新到新的值
+------+----------------------+
1 row in set (0.01 sec)

mysql> delete from test where num=1;  ← 删除表内的值
Query OK, 1 row affected (0.00 sec)

mysql> select * from test;  ← 确认删除结果
Empty set (0.01 sec)

mysql> drop table test;  ← 删除表
Query OK, 0 rows affected (0.01 sec)

mysql> show tables;  ← 查看表信息
Empty set (0.00 sec)  ← 确认表已被删除

mysql> drop database test;  ← 删除名为test的数据库
Query OK, 0 rows affected (0.01 sec)

mysql> show databases;  ← 查看已存在的数据库
Empty set (0.01 sec)  ← 确认test数据库已被删除(这里非root用户的关系,看不到名为mysql的数据库)

mysql> exit  ← 退出MySQL服务器
Bye


   然后,删除测试用过的遗留用户。

[root@sample ~]# mysql -u root -p  ← 通过密码用root登录
Enter password:  
← 在这里输入密码

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 12 to server version: 4.1.20

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> revoke all privileges on *.* from centospub@localhost;  ← 取消centospub用户对数据库的操作权限
Query OK, 0 rows affected (0.00 sec)

mysql> delete from mysql.user where user='centospub' and host='localhost';  ← 删除centospub用户
Query OK, 1 row affected (0.01 sec)

mysql> select user from mysql.user where user='centospub';  ← 查找用户centospub,确认已删除与否
Empty set (0.01 sec)  ← 确认centospub用户已不存在

mysql> flush privileges;  ← 刷新,使以上操作生效
Query OK, 0 rows affected (0.01 sec)

mysql> exit
Bye


  最后,重新启动一次HTTP服务,让php-mysql反映到HTTP服务中。

[root@sample ~]# /etc/rc.d/init.d/httpd restart  ← 重新启动HTTP服务
Stopping httpd:             [ OK ]
Starting httpd:             [ OK ]



[root@mysql ~]# service iptables stop
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Setting chains to policy ACCEPT: filter          [  OK  ]
iptables: Unloading modules:                               [  OK  ]

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


2、增加授权:

授权用户,你想root使用密码从任何主机连接到mysql服务器

GRANT ALL PRIVILEGES ON *.* TO ‘root’@’%’ IDENTIFIED BY ‘root’  WITH GRANT
OPTION;

flush privileges;

如果你想允许用户root从ip为192.168.1.104的主机连接到mysql服务器

GRANT ALL PRIVILEGES ON *.* TO ‘myuser’@’192.168.1.104′ IDENTIFIED
BY ‘root’  WITH GRANT OPTION;

flush privileges;



CentOS-Mysql-Access denied for user root


在CentOS(64bit)平台,无法使用root用户进行登录;

mysql -u root -p

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

CentOS-Mysql-Access denied for user root

工具/原料

  • CentOS
  • Mysql

方法/步骤

  1. 停掉MySQL服务:

       /etc/init.d/mysqld stop

    使用safe模式,进行重启:

       mysqld_safe --skip-grant-tables

    CentOS-Mysql-Access denied for user root
  2. 使用root账户,无密码登录:

      mysql -u root

    选择mysql database:

      use mysql;

    为root用户更改密码为: 123456(自行设定):

      update user set password=PASSWORD("123456") where User = 'root';

    CentOS-Mysql-Access denied for user root
  3. 停止MySQL 服务:

    /etc/init.d/mysqld stop

    重新启动MySQL服务:

    /etc/init.d/mysqld start

    使用root账户正常登录:

    mysql -u root -p

    CentOS-Mysql-Access denied for user root





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