在配置Mysql主從備份時 從資料庫的狀態一直是Error,狀態圖如下

原因：從資料庫讀取日誌檔案位置問題，沒有與主資料的位置相對應；

解決方式：檢視主資料庫的狀態

更改從資料庫讀取日誌的檔案和位置

mysql> CHANGE MASTER TO MASTER_LOG_FILE='master_log.000005',MASTER_LOG_POS=154;
Query OK, 0 rows affected (0.00 sec)

mysql> change master to master_host='192.168.8.7',master_user='myslave',master_password='123456',master_log_file='master_log.000005'; 
Query OK, 0 rows affected, 3 warnings (0.00 sec)
 

然後主從關係生效：

*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.8.7
                  Master_User: myslave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master_log.000005
          Read_Master_Log_Pos: 154
               Relay_Log_File: node03-relay-bin.000004
                Relay_Log_Pos: 321
        Relay_Master_Log_File: master_log.000005
             Slave_IO_Running: Yes
            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: 154
              Relay_Log_Space: 904
              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: 0
                Last_IO_Error: 
               Last_SQL_Errno: 0
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 1
                  Master_UUID: cb10f6cf-d1f7-11e8-a480-000c29563c0d
             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 more updates
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: 
                Auto_Position: 0
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)