mysql數據庫主從庫配置之主從切換

create user 'rep1'@'%' identified by 'rep1abcd1243d'; GRANT REPLICATION SLAVE ON *.* TO 'rep1'@'%'; 

root@localhost:francs>show slave status\G 

root@localhost:francs>show slave hosts; +-----------+-------------------+------+-----------+--------------------------------------+ | Server_id | Host | Port | Master_id | Slave_UUID | +-----------+-------------------+------+-----------+--------------------------------------+ | 2 | 192.168.2.38(db2) | 3306 | 1 | ad397a06-7c56-11e4-b2fb-000c29dcb3b5 | +-----------+-------------------+------+-----------+--------------------------------------+ 1 row in set (0.00 sec) 

root@localhost:francs>stop slave IO_THREAD; root@localhost:francs>show slave status\G *************************** 1. row ***************************  Slave_IO_State:   Master_Host: 192.168.2.37  Master_User: rep1  Master_Port: 3306  Connect_Retry: 60  Master_Log_File: bin-log.000001  Read_Master_Log_Pos: 362  Relay_Log_File: db2-relay-bin.000002  Relay_Log_Pos: 523  Relay_Master_Log_File: bin-log.000001  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: 362  Relay_Log_Space: 694  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: 0  Last_SQL_Error:   Replicate_Ignore_Server_Ids:   Master_Server_Id: 1  Master_UUID: 0c130d47-22bb-11e4-aaaa-000c2986ac80  Master_Info_File: mysql.slave_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:   Last_SQL_Error_Timestamp:   Master_SSL_Crl:   Master_SSL_Crlpath:   Retrieved_Gtid_Set:   Executed_Gtid_Set:   Auto_Position: 0 1 row in set (0.00 sec) 

root@localhost:francs>stop slave; root@localhost:francs>reset master; root@localhost:francs>reset slave all; root@localhost:francs>show binary logs; +----------------+-----------+ | Log_name | File_size | +----------------+-----------+ | bin-log.000001 | 120 | +----------------+-----------+ 1 row in set (0.00 sec) 

mysql> CHANGE MASTER TO  MASTER_HOST='192.168.1.61',  MASTER_PORT=3306,  MASTER_USER='rep1',  MASTER_PASSWORD='rep1abcd1243d',  MASTER_LOG_FILE='bin-log.000001',  MASTER_LOG_POS=120;   root@localhost:francs>start slave; root@localhost:francs>show slave status\G 

2015-03-02 14:24:14 26198 [ERROR] Slave I/O: error connecting to master '[email protected]:3306' - retry-time: 60 retries: 8, Error_code: 1045 

--連接測試 [mysql@db1 ~]$ mysql -h 192.168.1.60 -P 3306 -urep1  備注：居然不需要密碼能直接能連上。 --測試匿名用戶 [mysql@db1 ~]$ mysql -h 192.168.1.60 -P 3306 -urep2  備注：依然不需要密碼。 --原因分析 root@localhost:francs>select Host,User,Password from mysql.user where User=''; +-----------+------+----------+ | Host | User | Password | +-----------+------+----------+ | localhost | | | | db1 | | | +-----------+------+----------+ 備注: 原來 db2 節點上存在 User 為空的的兩行，表示匿名用戶可以連接數據庫， 刪除這兩行，之後 flush privileges; --再連接測試 [mysql@db1 ~]$ mysql -h 192.168.1.60 -P 3306 -urep1  備注：這次連接需要密碼了。之後再次觀看 db1 同步日志，不再報錯。 

root@localhost:francs>insert into test_sr(id) values(30); Query OK, 1 row affected (0.03 sec) root@localhost:francs>select * from test_sr order by id desc limit 1; +------+---------------------+ | id | create_time | +------+---------------------+ | 30 | 2015-03-02 15:19:53 | +------+---------------------+ 1 row in set (0.00 sec) 

root@localhost:francs>select * from test_sr order by id desc limit 1; +------+---------------------+ | id | create_time | +------+---------------------+ | 30 | 2015-03-02 15:19:53 | +------+---------------------+ 1 row in set (0.00 sec)