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)
備注:reset slave all 命令會刪除從庫的 replication 參數,之後 show slave status\G 的信息返回為空。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)
備注:這步執行之後,發現 db1 日志文件報了以下錯誤,提示 db1 連接不上 db2。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)
備注:數據同步正常,以上是對 MySQL 主備切換的初次了解,後續再補充。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)