在my.cnf确认主和从的server_id不一致
主：
show master status;
------------------ ---------- -------------- ------------------ -----------------------------------------------
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
------------------ ---------- -------------- ------------------ -----------------------------------------------
| mysql-bin.000048 | 104783 | | | 9a9bcbe6-d459-11e9-82f8-068c8400044e:1-184780 |
------------------ ---------- -------------- ------------------ -----------------------------------------------
从：
stop slave;reset slave; change master to master_host=‘192.168.1.20‘, master_port=3307, master_user=‘mysql_user‘, master_password=‘123456‘, master_log_file=‘mysql-bin.000048‘, master_log_pos=104783; start slave; show slave statusG
注意：需要master_log_file和master_log_pos需要和在主中查询到的数据一致