MySQL主从数据库配置攻略以及错误处理

MySQL主从复制配置1. 要求1.1 系统平台一致1.2 数据库版本一致2. 修改my.cnf文件，主服务器和备服务器要求server-id不能一样3. 启动两侧的数据库4. 在主服务器上建立账号，并且授权slave，从服务器可访问GRANT REPLICATION SLAVE ON *.* to "mysql_sync"@"10.10.88.101" identified by "123456";5. 查看主服务器状态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：执行完此步骤后不要再操作主服务器MYSQL，防止主服务器状态值变化6. 配置从服务器Slavemysql> 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; //启动从服务器复制功能
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. 检查从服务器复制功能状态（在从服务器上面执行检查）：mysql> show slave statusG mysql> show slave statusG*************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.10.88.100 --主服务器IP Master_User: mysql_sync --主服务器数据库账号名称 Master_Port: 3306 --数据库端口 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 --状态，必须为Yes Slave_SQL_Running: Yes --状态，必须为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: 0Master_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: 01 row in set （0.00 sec）
配置过程中，因为后来从主库cp过来所有的数据文件，作为从库的初始环境，结果就报错如下：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.经过分析，是因为从主库cp了所有文件，导致server_uuid一致，所以从库起不来，解决办法如下：1. 进入到数据目录cd /app/mysqldata2. 备份auto.cnf 让数据库自动生成一个新的uuid来用cp auto.cnf auto.cnf.bakrm -rf auto.cnf3. 重新启动主库以及从库查看主库状况，重置从库状态，启动slave即可。本文永久更新链接地址