浅析mysql主从复制中复制用户的权限管理

    在用复制账号对mysql salve管理过程中，使用哪些权限合适？首先看一下mysql官方提供的权限表：

    怎样找到复制账户的最小权限？

    首先使用root账号登陆，收回复制账号repl_user的所有权限：

mysql> select user();

+----------------+

| user()         |

+----------------+

| root@localhost |

+----------------+

1 row in set (0.00 sec)

mysql> revoke all on *.* from repl_user;

Query OK, 0 rows affected (0.01 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

    其次使用repl_user登陆：

mysql> show slave status\G;

ERROR 1227 (42000): Access denied; you need (at least one of) the SUPER,REPLICATION CLIENT privilege(s) for this operation

    错误提示，至少需要SUPER和REPLICATION CLIENT这两个权限之一。

    （1）赋予REPLICATION CLIENT权限给repl_user

mysql> grant REPLICATION CLIENT ON *.* TO repl_user;

Query OK, 0 rows affected (0.00 sec)

mysql> show slave status\G;

*************************** 1. row ***************************

               Slave_IO_State: Connecting to master

                  Master_Host: 192.168.6.100

                  Master_User: repl_user

                  Master_Port: 3306

                Connect_Retry: 60

                            ......

    show slave status\G;状态查看正常，但是管理slave提示如下：

mysql> stop slave;

ERROR 1045 (28000): Access denied for user ‘repl_user‘@‘%‘ (using password: YES)

    （2）赋予REPLICATION SLAVE权限给repl_user：

mysql> grant REPLICATION SLAVE ON *.* TO repl_user;

Query OK, 0 rows affected (0.00 sec)

mysql> stop slave;

ERROR 1045 (28000): Access denied for user ‘repl_user‘@‘%‘ (using password: YES)

mysql> SELECT Repl_slave_priv,Repl_client_priv,super_priv FROM mysql.USER WHERE USER=‘repl_user‘;

+-----------------+------------------+------------+

| Repl_slave_priv | Repl_client_priv | super_priv |

+-----------------+------------------+------------+

| Y               | Y                | N          |

+-----------------+------------------+------------+

1 row in set (0.00 sec)

    （3）赋予SUPER权限给repl_user：

mysql> grant SUPER ON *.* TO repl_user;

Query OK, 0 rows affected (0.00 sec)

mysql> stop slave;

Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> start slave;

Query OK, 0 rows affected, 1 warning (0.00 sec)

    （4）赋予RELOAD权限给repl_user

    在没有RELOAD权限时提示如下错误：

mysql> reset slave;

ERROR 1227 (42000): Access denied; you need (at least one of) the RELOAD privilege(s) for this operation

mysql> grant reload on *.* to repl_user;

Query OK, 0 rows affected (0.00 sec)

mysql> reset slave;

Query OK, 0 rows affected (0.00 sec)

    最后，总结如下：

    REPLICATION CLIENT（客户端）、REPLICATION SLAVE（服务端）、SUPER（管理）和RELOAD四个权限最好在创建用户时就赋予，以免造成不必要的麻烦，当然，要是主主配置，最好给予ALL权限。

    上述只是在工作中的一点思考，希望看到这篇博文的博友给予指正。