我看过许多类似的问题，因此表明我已经检查了基础知识。当然，这并不意味着我没有错过任何显而易见的东西。:-)

我的问题是：为什么我拒绝具有特权的用户访问权限，而我却已经在其中输入密码并被授予访问权限？（为了完整起见，我尝试输入错误的密码只是为了确保MySQL客户端在程序启动时拒绝我访问。）

背景：

通过ssh登录到运行MySQL服务器的计算机的外壳，我以root用户身份登录：

[myname@host ~]$ mysql -u root -p -hlocalhost
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 62396
Server version: 5.5.18-log MySQL Community Server (GPL)

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

mysql>

太棒了 我对类似问题的答案的阅读表明，我应该确保特权与授予表中的权限保持最新

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

mysql>

接下来，请确保我是我认为的我：

mysql> SELECT user();
+----------------+
| user()         |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.00 sec)

…真的 真的很 确定：

mysql> SELECT current_user();
+----------------+
| current_user() |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.00 sec)

mysql>

到目前为止，一切都很好。现在我有什么特权？

mysql> SHOW GRANTS FOR 'root'@'localhost';
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost                                                                                                                                                                                                                                                                                                                                                                                                        |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '[OBSCURED]' WITH GRANT OPTION |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

现在有点难以理解，所以让我们尝试这种方式（您还将看到有一个非本地“ root”用户）：

mysql> SELECT * FROM mysql.user WHERE User='root'\G
*************************** 1. row ***************************
                 Host: localhost
                 User: root
             Password: *[OBSCURED]
          Select_priv: Y
          Insert_priv: Y
          Update_priv: Y
          Delete_priv: Y
          Create_priv: Y
            Drop_priv: Y
          Reload_priv: Y
        Shutdown_priv: Y
         Process_priv: Y
            File_priv: Y
           Grant_priv: Y
      References_priv: Y
           Index_priv: Y
           Alter_priv: Y
         Show_db_priv: Y
           Super_priv: Y
Create_tmp_table_priv: Y
     Lock_tables_priv: Y
         Execute_priv: Y
      Repl_slave_priv: Y
     Repl_client_priv: Y
     Create_view_priv: Y
       Show_view_priv: Y
  Create_routine_priv: Y
   Alter_routine_priv: Y
     Create_user_priv: Y
           Event_priv: Y
         Trigger_priv: Y
             ssl_type: 
           ssl_cipher: 
          x509_issuer: 
         x509_subject: 
        max_questions: 0
          max_updates: 0
      max_connections: 0
 max_user_connections: 0
*************************** 2. row ***************************
                 Host: [HOSTNAME].com
                 User: root
             Password: *[OBSCURED]
          Select_priv: Y
          Insert_priv: Y
          Update_priv: Y
          Delete_priv: Y
          Create_priv: Y
            Drop_priv: Y
          Reload_priv: Y
        Shutdown_priv: Y
         Process_priv: Y
            File_priv: Y
           Grant_priv: Y
      References_priv: Y
           Index_priv: Y
           Alter_priv: Y
         Show_db_priv: Y
           Super_priv: Y
Create_tmp_table_priv: Y
     Lock_tables_priv: Y
         Execute_priv: Y
      Repl_slave_priv: Y
     Repl_client_priv: Y
     Create_view_priv: Y
       Show_view_priv: Y
  Create_routine_priv: Y
   Alter_routine_priv: Y
     Create_user_priv: Y
           Event_priv: Y
         Trigger_priv: Y
             ssl_type: 
           ssl_cipher: 
          x509_issuer: 
         x509_subject: 
        max_questions: 0
          max_updates: 0
      max_connections: 0
 max_user_connections: 0
 2 rows in set (0.00 sec)

太棒了！MySQL认为我是root @ localhost，而root @ localhost拥有所有这些特权。这意味着我应该能够做我想做的事，对不对？

mysql> GRANT ALL PRIVILEGES ON *.* TO 'steves'@'[hostname].com' IDENTIFIED BY '[OBSCURED]' WITH GRANT OPTION;
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

我怎么能搞砸这个基本的东西？

旁注：对于任何想建议我没有名为root的用户都具有所有特权的用户，这很好，一旦我可以给另一个用户一些特权，我将考虑做一些事情。

谢谢！