摘要：
因此，找不到中继日志。如果没有，中继日志将以主机名命名，即主机名-中继站。000001解决方案：您可以在my。cnf，然后重新启动MySQL服务。
一台MySQL服务器重启后发现主从复制报错
Last_Errno: 1872
Last_Error: Slave failed to initialize relay log info structure from the repository mysql> show slave statusG; *************************** 1. row *************************** Slave_IO_State: Master_Host: X.X.X.X Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000076 Read_Master_Log_Pos: 828924371 Relay_Log_File: localhost-relay-bin.000188 Relay_Log_Pos: 720496744 Relay_Master_Log_File: mysql-bin.000076 Slave_IO_Running: No Slave_SQL_Running: No Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 1872 Last_Error: Slave failed to initialize relay log info structure from the repository Skip_Counter: 0 Exec_Master_Log_Pos: 828924371 Relay_Log_Space: 0 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: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 1872 Last_SQL_Error: Slave failed to initialize relay log info structure from the repository Replicate_Ignore_Server_Ids: Master_Server_Id: 0 Master_UUID: 54481e1e-99ad-11e5-8540-000af78d3c6c Master_Info_File: /home/mysql/mysql-data/mysql/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: 210907 15:32:42 Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 Replicate_Rewrite_DB: Channel_Name: 1 row in set (0.00 sec) ERROR: No query specified
应该是服务器的主机名改过，relay-log也没有命名写在配置文件中。所以造成无法找到中继日志。
如果不命名会以主机名命名relay-log即
主机名-relay-bin.000001
解决办法：
可以在my.cnf指定中继日志名字，然后重启一下MySQL服务即可。
# cat /etc/my.cnf |grep relay relay-log=db1-relay-bin
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