MySQL主从无损同步复制项目出现报错Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids;

1、问题描述：

#做一主三从无损同步复制项目的时候，查看从库状态命令

mysql> show slave status G
*************************** 1. row ***************************
               Slave_IO_State: 
                  Master_Host: 192.168.1.50
                  Master_User: repuser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: 
          Read_Master_Log_Pos: 4
               Relay_Log_File: tsedb-relay.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: 
             Slave_IO_Running: No
            Slave_SQL_Running: Yes
              Replicate_Do_DB: 
          Replicate_Ignore_DB: 
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: 
                   Last_Errno: 0
                   Last_Error: 
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 0
              Relay_Log_Space: 154
              Until_Condition: None
               Until_Log_File: 
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_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: No
                Last_IO_Errno: 1593
                Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids; these ids must be different for replication to work (or the --replicate-same-server-id option must be used on slave but this does not always make sense; please check the manual before using it).
               Last_SQL_Errno: 0
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 513306
                  Master_UUID: 
             Master_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 210315 13:03:17
     Last_SQL_Error_Timestamp: 
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: a0131717-8493-11eb-bc10-000c2983931c:1-116
                Auto_Position: 1
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

#查看到 Slave_IO_Running是NO的，然后查看到下面的错误提示

Slave_IO_Running: No
Slave_SQL_Running: Yes
Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids; these ids must be different for replication to work
 (or the --replicate-same-server-id option must be used on slave but this does not always make sense; please check the manual before using it).

2、解决方法：

#原来是主库1.50的配置文件ID有问题server-id=503306，一开始是主从的serverID一样

#把主库的my.cnf的server_id修改了，然后重启服务

#然后在从库关闭主从集群重新开启，就可以看到同步了

stop slave;
start slave;