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The following content mainly brings you the mysql master-slave copy command execution process, the knowledge here is slightly different from books, are summed up by professional and technical personnel in the process of contact with users, have a certain experience sharing value, hope to bring help to the majority of readers.

I use docker to mirror the two containers generated here, so it will cause master-slave replication to fail: the master-slave uuid (UUID is the universal unique identifier) is the same.

Mysql > stop slave;Query OK, 0 rows affected (0.01 sec) mysql > CHANGE MASTER TO MASTER_HOST='172.18.0.201',-> MASTER_PORT=3306,-> MASTER_USER='rep',-> MASTER_PASSWORD='123',-> MASTER_LOG_FILE='binlog.000003',-> MASTER_LOG_POS=404;Query OK, 0 rows affected, 2 warnings (0.05 sec) mysql > start slave;Query OK, 0 rows affected (0.01 sec) mysql > show slave status\ G * * 1. Row * * Slave_IO_State: Master_Host: 172.18.0.201 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: binlog.000003 Read_Master_Log_Pos: 404 Relay_Log_File: mysqld-relay-bin.000001 Relay_Log_Pos: 4 Relay_Master_Log_File: binlog.000003 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: 404 Relay_Log_Space: 120 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: NULLMaster_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 s erver UUIDs These UUIDs must be different for replication to work. Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 1 Master_UUID: Master_Info_File: / var/lib/mysql/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log Waiting for the slave I/O thread to update it Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: 190614 11:55:05 Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position : 01 row in set (0.00 sec) ERROR:No query specifiedmysql >

Slave:

[root@e915630786b3 log] # cat / var/lib/mysqlmysql/ mysql-files/ [root@e915630786b3 log] # cat / var/lib/mysql/ auto.cnf [auto] server-uuid=c9db6142-8bfd-11e9-b3b7-0242ac110002

Master:

[root@3b7cfc77f2b8 /] # cat / var/lib/mysql/ auto.cnf [auto] server-uuid=c9db6142-8bfd-11e9-b3b7-0242ac110002

Slave:

[root@e915630786b3 log] # rm-rf / var/lib/mysql/auto.cnf [root@e915630786b3 log] # systemctl restart mysql [root@e915630786b3 log] # cat / var/lib/mysql/ auto.cnf [auto] server-uuid=c6f8e6d0-8e9b-11e9-84c9-0242ac1200ca

Just execute the master-slave copy command again.

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