MySQL主從資料庫配置攻略以及錯誤處理

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MySQL主從資料庫配置攻略以及錯誤處理

 MySQL主從複製配置

1. 要求

1.1 系統平台一致

1.2 資料庫版本一致

2. 修改my.cnf檔案,主伺服器和備伺服器要求server-id不能一樣

3. 啟動兩側的資料庫

4. 在主伺服器上建立帳號,並且授權slave,從伺服器可訪問

GRANT REPLICATION SLAVE ON *.* to 'mysql_sync'@'10.10.88.101' identified by '123456';

5. 查看主伺服器狀態

mysql> show master status;

+---------------+----------+--------------+------------------+-------------------+

| File          | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

+---------------+----------+--------------+------------------+-------------------+

| dbtest.000005 |      414 |              |                  |                  |

+---------------+----------+--------------+------------------+-------------------+

1 row in set (0.15 sec)

注意:執行完此步驟後不要再操作主伺服器MYSQL,防止主伺服器狀態值變化

6. 配置從伺服器Slave

mysql> change master to master_host='10.10.88.100',master_user='mysql_sync',master_password='123456',master_log_file='dbtest.000005',master_log_pos=414;

mysql> start slave;    //啟動從伺服器複製功能

 


mysql> change master to master_host='10.10.88.100',master_user='mysql_sync',master_password='123456',master_log_file='dbtest.000007',master_log_pos=120;

Query OK, 0 rows affected, 2 warnings (0.12 sec)

 


mysql> start slave;

Query OK, 0 rows affected (0.24 sec)

 


7. 檢查從伺服器複製功能狀態(在從伺服器上面執行檢查):

mysql> show slave status\G

 

 

 

mysql> show slave status\G

*************************** 1. row ***************************

              Slave_IO_State: Waiting for master to send event

                  Master_Host: 10.10.88.100                              --主伺服器IP

                  Master_User: mysql_sync                                --主伺服器資料庫帳號名稱

                  Master_Port: 3306                                      --資料庫連接埠

                Connect_Retry: 60

              Master_Log_File: dbtest.000005

          Read_Master_Log_Pos: 414

              Relay_Log_File: DBTEST2-relay-bin.000002

                Relay_Log_Pos: 280

        Relay_Master_Log_File: dbtest.000005

            Slave_IO_Running: Yes                                      --狀態,必須為Yes

            Slave_SQL_Running: Yes                                      --狀態,必須為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: 414

              Relay_Log_Space: 455

              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: 73b077c6-626d-11e5-8f5b-000c29e840c1

            Master_Info_File: /app/mysqldata/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)

 

 

 

 


配置過程中,因為後來從主庫cp過來所有的資料檔案,作為從庫的初始環境,結果就報錯如下:

Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs;  these UUIDs must be different for replication to work.

經過分析,是因為從主庫cp了所有檔案,導致server_uuid一致,所以從庫起不來,解決辦法如下:

1. 進入到資料目錄

cd /app/mysqldata

2. 備份auto.cnf 讓資料庫自動產生一個新的uuid來用

cp auto.cnf auto.cnf.bak

rm -rf auto.cnf

3. 重新啟動主庫以及從庫

查看主庫狀況,重設從庫狀態,啟動slave即可。

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