MySQL雙主熱備問題處理，mysql主熱備

MySQL雙主熱備問題處理，mysql主熱備

1. Slave_IO_Running: No

mysql> show slave status\G*************************** 1. row ***************************               Slave_IO_State:                  Master_Host: 192.16.10.21                  Master_User: cahms                  Master_Port: 3306                Connect_Retry: 60              Master_Log_File: mysql-bin.000003          Read_Master_Log_Pos: 20398               Relay_Log_File: mysqld-relay-bin.000001                Relay_Log_Pos: 4        Relay_Master_Log_File: mysql-bin.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: 20398              Relay_Log_Space: 106              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 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:1 row in set (0.00 sec)

(1) master and slave have equal MySQL server ids
【解決辦法】
修改/etc/my.cnf 下的server-id的值，確保master和slave的server-id不一樣即可；

(2) Error reading packet from server:

Access denied; you need the REPLICATION SLAVE privilege for this operation ( server_errno=1227)

【解決辦法】主伺服器給的複製許可權不夠，重新賦予許可權。

```> grant replication slave on *.* to 'uname'@'對端ip' identified by 'password'；> flush privileges；

== e.g ==

> grant replication slave on *.* to 'root'@'192.16.10.21'     identified by 'root';> grant replication slave on *.* to 'root'@'192.16.10.23'   identified by 'root';

2. Slave_IO_State:

Waiting to reconnect after a failed master event readmysql> show slave status\G*************************** 1. row ***************************               Slave_IO_State: Waiting to reconnect after a failed master event read                  Master_Host: 192.16.10.231                  Master_User: cahms                  Master_Port: 3306                Connect_Retry: 60              Master_Log_File: mysql-bin.000003          Read_Master_Log_Pos: 106               Relay_Log_File: mysqld-relay-bin.000001                Relay_Log_Pos: 4        Relay_Master_Log_File: mysql-bin.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: 106              Relay_Log_Space: 106              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: 0                Last_IO_Error:               Last_SQL_Errno: 0               Last_SQL_Error:1 row in set (0.00 sec)

【解決辦法】

> grant replication slave on *.* to 'root'@'192.16.10.228'  identified by 'root';> grant replication slave on *.* to 'root'@'192.16.10.231'     identified by 'root';> flush privileges;