使用場景：

在日常使用中，經常會使用到數據庫系統，其中互聯網中使用數據庫種類頻率最多的要屬MySQL數據庫，但使用該數據庫不僅僅是單個數據庫對應單個用戶（root），一定會涉及權限管理問題，針對某個數據庫創建對應的賬戶進行單獨授權管理，控制該用戶不可越權操作其他數據庫。不可具有root權限。

解決方案：

1、先使用root管理員賬戶登錄數據庫。

#mysql -uroot -p

2、查看數據庫是否已有，此處以bastion數據庫為例。

mysql> show databases;
+--------------------+
| Database     |
+--------------------+
 

| information_schema|
| assets      |
| auth       |
| auto_test     |
| bastion      |
| different     |
| django      |
| hl7        |
| mysql       |
| performance_schema|
| phpmyadmin    |
| scrap       |
| sys        |
| system_openfalcon |
| syswork      |
+--------------------+
17 rows in set
 
 (0.02 sec)

3、如果沒有創建數據庫。

mysql> create database bastion charset=utf8

4、創建用於管理bastion數據庫的用戶。

mysql>CREATE USER ‘bastion‘@‘localhost‘ IDENTIFIED BY ‘密碼‘;

5、進行對bastion數據庫授權。

mysql>grant all on bastion.* to ‘bastion‘@‘localhost‘;

6、登錄驗證。

#mysql -ubastion -p
Enter password: 
Welcome to the MySQL monitor.  Commands end
 
 with ; or \g.
Your MySQL connection id is 29298
Server version: 5.7.22-0ubuntu0.16.04.1 (Ubuntu)
 
Copyright (c) 2000, 2018, 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> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| bastion            |
+--------------------+
2 rows in set (0.02 sec)
 
mysql> 
mysql> use bastion
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> show tables;
+----------------------------+
| Tables_in_bastion          |
+----------------------------+
| acct                       |
| auth_group                 |
| auth_group_permissions     |
| auth_permission            |
| auth_user                  |
| auth_user_groups           |
| auth_user_user_permissions |
| django_admin_log           |
| django_content_type        |
| django_migrations          |
| django_session             |
| host                       |
| host_grp                   |
| manage_user                |
| order                      |
| privilege                  |
| user                       |
+----------------------------+
17 rows in set (0.01 sec)
 
mysql>

以上可以正常使用該用戶進行該數據庫專有使用操作。

MySQL最簡單的指定數據庫進行授權操作