配置完slave后，show slave status\G;报错如下

Got fatal error 1236 from master when reading data from binary log: 'Slave can not handle replication events with the checksum that master is configured to log; the first event 'mysql-bin.000002' at 120, the last event read from './mysql-bin.000002' at 120, the last byte read from './mysql-bin.000002' at 120

后来发现是因为主库MySQL版本是5.6， 从库是5.5

5.6的版本中加入了replication event checksum，主从复制时间校验功能，所以需要把这个关掉才能正常同步到5.5的slave

修改主库 /etc/my.cnf

增加下一行

binlog_checksum=none

重启mysql

现在再看从库status就正常了~

mysql> show slave status\G;*************************** 1. row ***************************               Slave_IO_State: Waiting for master to send event                  Master_Host: 192.168.0.121                  Master_User: replication                  Master_Port: 3306                Connect_Retry: 60              Master_Log_File: mysql-bin.000003          Read_Master_Log_Pos: 120               Relay_Log_File: mysqld-relay-bin.000002                Relay_Log_Pos: 266        Relay_Master_Log_File: mysql-bin.000003             Slave_IO_Running: Yes            Slave_SQL_Running: Yes              Replicate_Do_DB: kudong          Replicate_Ignore_DB: mysql,information_schema           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: 120              Relay_Log_Space: 423              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: 11 row in set (0.00 sec)