slave have equal MySQL Server UUIDs原因及解決

slave have equal MySQL Server UUIDs原因及解決

最近在部署MySQL主從複製架構的時候，碰到了"Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs;  these UUIDs must be different for replication to work." 這個錯誤提示。即主從架構中使用了相同的UUID。檢查server_id系統變數，已經是不同的設定，那原因是？接下來為具體描述。

1、錯誤訊息
mysql> show slave staus;
 
Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs;
these UUIDs must be different for replication to work.
 
2、查看主從的server_id變數
master_mysql> show variables like 'server_id';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id    | 33    |
+---------------+-------+

slave_mysql> show variables like 'server_id';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id    | 11    |
+---------------+-------+
-- 從上面的情形可知，主從mysql已經使用了不同的server_id

3、解決故障
###查看auto.cnf檔案
[root@dbsrv1 ~] cat /data/mysqldata/auto.cnf  ### 主上的uuid
[auto]
server-uuid=62ee10aa-b1f7-11e4-90ae-080027615026

[root@dbsrv2 ~]# more /data/mysqldata/auto.cnf ###從上的uuid，果然出現了重複，原因是複製了虛擬機器，只改server_id不行
[auto]
server-uuid=62ee10aa-b1f7-11e4-90ae-080027615026

[root@dbsrv2 ~]# mv /data/mysqldata/auto.cnf  /data/mysqldata/auto.cnf.bk  ###重新命名該檔案
[root@dbsrv2 ~]# service mysql restart          ###重啟mysql
Shutting down MySQL.[  OK  ]
Starting MySQL.[  OK  ]
[root@dbsrv2 ~]# more /data/mysqldata/auto.cnf  ###重啟後自動產生新的auto.cnf檔案，即新的UUID
[auto]
server-uuid=6ac0fdae-b5d7-11e4-a9f3-0800278ce5c9

###再次查看slave的狀態已經正常
[root@dbsrv1 ~]# mysql -uroot -pxxx -e "show slave status\G"|grep Running
Warning: Using a password on the command line interface can be insecure.
            Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it

###主庫端查看自身的uuid
master_mysql> show variables like 'server_uuid';
+---------------+--------------------------------------+
| Variable_name | Value                                |
+---------------+--------------------------------------+
| server_uuid  | 62ee10aa-b1f7-11e4-90ae-080027615026 |
+---------------+--------------------------------------+
1 row in set (0.00 sec)

###主庫端查看從庫的uuid
master_mysql> show slave hosts;
+-----------+------+------+-----------+--------------------------------------+
| Server_id | Host | Port | Master_id | Slave_UUID                          |
+-----------+------+------+-----------+--------------------------------------+
|        33 |      | 3306 |        11 | 62ee10aa-b1f7-11e4-90ae-080027615030 |
|        22 |      | 3306 |        11 | 6ac0fdae-b5d7-11e4-a9f3-0800278ce5c9 |
+-----------+------+------+-----------+--------------------------------------+
### Author : Leshami
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