mariadb數據庫用戶管理（創建、賦權、）

數據庫查看當前用戶 select user（）；

MariaDB [(none)]> select user();
+----------------+
| user()         |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.00 sec)

數據庫新建用戶 （--創建了一個名為：test 密碼為：1234 的用戶）

MariaDB [(none)]> create user 'test'@'localhost' identified by '1234';
Query OK, 0 rows affected (0.00 sec)

　

查詢用戶

MariaDB [zabbix]> select user,host from mysql.user;
+--------+-----------+
| user   | host      |
+--------+-----------+
| root   | 127.0.0.1 |
| root   | ::1       |
| root   | localhost |
| test   | localhost |
| zabbix | localhost |
+--------+-----------+
5 rows in set (0.00 sec)

修改用戶密碼

方法1，密碼實時更新；修改用戶“test”的密碼為“5678”

MariaDB [mysql]> set password for test@localhost =password('5678');                                     
Query OK, 0 rows affected (0.00 sec)

MariaDB [mysql]> exit
Bye

[root@192 ~]# mysql -utest -p5678
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 271
Server version: 10.2.36-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> select user();
+----------------+
| user() |
+----------------+
| test@localhost |
+----------------+
1 row in set (0.00 sec)

　方法2 ，需要刷新；修改用戶“test”的密碼為“1234”

MariaDB [(none)]> update mysql.user set password =password('root') where user='test';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

MariaDB [(none)]> flush privileges;  刷新權限
Query OK, 0 rows affected (0.00 sec)

　　方法3，命令行修改  mysqladmin -u用戶名 -p舊密碼 password 新密碼

[root@192 ~]# mysqladmin -uroot -p1 password root
[root@192 ~]# mysql -uroot -proot
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 95
Server version: 10.2.36-MariaDB MariaDB Server

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> 

分配用戶權限

授予用戶test通過外網IP對所有數據庫所有表的全部權限

MariaDB [(none)]> grant all privileges on *.* to 'test'@'%' identified by '1234'; 
Query OK, 0 rows affected (0.00 sec)

　注意：修改完權限以后 一定要刷新服務，或者重啟服務，刷新服務用：flush privileges;　

查看用戶權限 show grants for test；

MariaDB [(none)]> show grants for test;
+--------------------------------------------------------------------------------------------------------------+
| Grants for test@%                                                                                            |
+--------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*A4B6157319038724E3560894F7F932C8886EBFCF' |
+--------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

　查看自己的權限 show grants

MariaDB [(none)]> show grants;
+----------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost                                                                                                              |
+----------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*81F5E21E35407D884A6CD4A731AEBFB6AF209E1B' WITH GRANT OPTION |
| GRANT PROXY ON ''@'%' TO 'root'@'localhost' WITH GRANT OPTION                                                                          |
+----------------------------------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)

　　

回收用戶權限  revoke 

MariaDB [(none)]> show grants for test;
+--------------------------------------------------------------------------------------------------------------+
| Grants for test@%                                                                                            |
+--------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*A4B6157319038724E3560894F7F932C8886EBFCF' |
+--------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

MariaDB [(none)]> revoke all on *.* from test@'%';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> show grants for test;           
+-----------------------------------------------------------------------------------------------------+
| Grants for test@%                                                                                   |
+-----------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*A4B6157319038724E3560894F7F932C8886EBFCF' |
+-----------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

　　

　

刪除用戶 drop user test；

MariaDB [(none)]> drop user test;
Query OK, 0 rows affected (0.00 sec)