Mysql主从同步报错解决：Fatal error: The slave I/O thread stops because master and slave have equal..

报错信息：

在搭建Mysql主从架构过程中，由于从服务器是克隆的主服务器系统，导致主从Mysql uuid相同， Slave_IO无法启动，报错如下：
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.

解决方法：

找到auto.cnf文件，修改里面的uuid值，保证各个db的uuid不一样，重启db即可。

1.查看主库与从库UUID

[root@localhost ~]# find / -name auto.cnf
/var/lib/mysql/auto.cnf[root@localhost ~]# cat /var/lib/mysql/auto.cnf    //查看主数据库auto.cnf文件中的UUID信息
[auto]
server-uuid=e46c9961-5780-11ea-bf2f-000c291a8b6b[root@localhost ~]# mysql -uroot -p123qqq...A
...
mysql> show variables like '%server_uuid%';   //查看主数据库UUID
+---------------+--------------------------------------+
| Variable_name | Value                                |
+---------------+--------------------------------------+
| server_uuid   | e46c9961-5780-11ea-bf2f-000c291a8b6b |
+---------------+--------------------------------------+

[root@test2 ~]# find / -name auto.cnf
/var/lib/mysql/auto.cnf[root@test2 ~]# cat /var/lib/mysql/auto.cnf    //查看从数据库auto.cnf中的UUID信息
[auto]
server-uuid=e46c9961-5780-11ea-bf2f-000c291a8b6b[root@test2 ~]# mysql -uroot -p123qqq...A
...
mysql> show variables like '%server_uuid%';   //查看从数据库UUID
+---------------+--------------------------------------+
| Variable_name | Value                                |
+---------------+--------------------------------------+
| server_uuid   | e46c9961-5780-11ea-bf2f-000c291a8b6b |
+---------------+--------------------------------------+

2.修改主库或者从库auto.cnf文件的UUID

[root@localhost ~]# vim /var/lib/mysql/auto.cnf   //修改主库的auto.cnf文件的UUID
[auto]
server-uuid=e46c9961-5780-11ea-bf2f-000c128a8b6b   [root@localhost ~]# systemctl restart mysqld

3.从库重启slave进程，查看slave状态

[root@test2 ~]# mysql -uroot -p123qqq...A
...
mysql> stop slave;mysql> start slave;mysql> show slave status\G;
*************************** 1. row ***************************Slave_IO_State: Waiting for master to send eventMaster_Host: 192.168.2.128Master_User: mysqluserMaster_Port: 3306Connect_Retry: 60Master_Log_File: db128.000002Read_Master_Log_Pos: 452757169Relay_Log_File: test2-relay-bin.000002Relay_Log_Pos: 3205508Relay_Master_Log_File: db128.000002Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_Do_DB:Replicate_Ignore_DB:Replicate_Do_Table:Replicate_Ignore_Table:Replicate_Wild_Do_Table:Replicate_Wild_Ignore_Table:Last_Errno: 0Last_Error:Skip_Counter: 0Exec_Master_Log_Pos: 452757169Relay_Log_Space: 3205715Until_Condition: NoneUntil_Log_File:Until_Log_Pos: 0Master_SSL_Allowed: NoMaster_SSL_CA_File:Master_SSL_CA_Path:Master_SSL_Cert:Master_SSL_Cipher:Master_SSL_Key:Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: NoLast_IO_Errno: 0Last_IO_Error:Last_SQL_Errno: 0Last_SQL_Error:Replicate_Ignore_Server_Ids:Master_Server_Id: 128Master_UUID: e46c9961-5780-11ea-bf2f-000c128a8b6bMaster_Info_File: /var/lib/mysql/master.infoSQL_Delay: 0SQL_Remaining_Delay: NULLSlave_SQL_Running_State: Slave has read all relay log; waiting for more updatesMaster_Retry_Count: 86400Master_Bind:Last_IO_Error_Timestamp:Last_SQL_Error_Timestamp:Master_SSL_Crl:Master_SSL_Crlpath:Retrieved_Gtid_Set:Executed_Gtid_Set:Auto_Position: 0Replicate_Rewrite_DB:Channel_Name:Master_TLS_Version:
1 row in set (0.00 sec)

可以看到IO线程、SQL线程都是Yes状态。

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Mysql主从同步报错解决：Fatal error: The slave I/O thread stops because master and slave have equal..

报错信息：

解决方法：

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