mysql用戶管理
一，創建和刪除用戶
mysql> select current_user(); 查詢當前的登錄用戶
+----------------+
| current_user() |
+----------------+
| root@localhost |
+----------------+
創建用戶的時候沒有分配任何權限，%表示的是任何機器，但是不包括localhost和127.0.0.1
mysql> create user 'chenzhongyang'@'%' identified by '123456';
mysql> create user 'chen'@'127.0.0.1' identified by '123456';
刪除用戶
mysql> drop user 'chenzhongyang'@'%';
Query OK, 0 rows affected (0.04 sec)
[root@test4 /]# mysql -uchen -p123456 -h127.0.0.1
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.1.70-log Source distribution
Copyright (c) 2000, 2013, 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> select user();
+----------------+
| user() |
+----------------+
| chen@localhost |
+----------------+
1 row in set (0.01 sec)
剛剛創建的用戶的權限是usage
mysql> show grants;
+-------------------------------------------------------------------------------------------------------------+
| Grants for [email protected] |
+-------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'chen'@'127.0.0.1' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |
+-------------------------------------------------------------------------------------------------------------+
1 row in set (0.02 sec)
修改用戶名，這個時候密碼和權限沒有變化
mysql> rename user 'chen'@'127.0.0.1' to 'chenzhongyang'@'127.0.0.1';
二，匿名用戶
創建匿名用戶之後，那麼任何機器的任何用戶都可以登錄到mysql，所以這樣很危險
mysql> insert into user(host,user,password) values('%','','');
Query OK, 1 row affected, 3 warnings (0.17 sec)
mysql> flush privileges; 刷新權限將重新加載user表的內容
Query OK, 0 rows affected (0.03 sec)
三，授權用戶
例子如下
mysql> grant select on mysql.user to 'chenzhongyang'@'127.0.0.1' identified by '123456';
Query OK, 0 rows affected (0.32 sec)
[root@test4 /]# mysql -uchenzhongyang -p123456 -h127.0.0.1
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.1.70-log Source distribution
Copyright (c) 2000, 2013, 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.
mysql> select host from mysql.user where user='chenzhongyang';
+-----------+
| host |
+-----------+
| 127.0.0.1 |
+-----------+
1 row in set (0.04 sec)
授權的範圍
回收權限
資源限制
