主从同步出现一下错误：
Slave_IO_Running: Connecting
Slave_SQL_Running: Yes
解决方法：
导致lave_IO_Running 为connecting 的原因主要有以下 3 个方面：
1、网络不通
2、密码不对
3、pos不对
我敢肯定的并且排除的两个原因
很显然的问题是出现在 password 上面，只是我在从库上执行
CHANGE MASTER TO
MASTER_HOST=‘192.168.223.101’,
MASTER_USER=‘liyao’,
MASTER_PASSWORD=‘liyao’,
MASTER_LOG_FILE=‘mysql-bin.000008’,
MASTER_LOG_POS= 261;
的时候 MASTER_PASSWORD=‘liyao’, 中的 ‘liyao’ 写成了 'liyao '，因此导致了从库上的 Slave_IO_Running: Connecting。
修改过后再来查看从库的状态，问题已经解决
mysql> show slave status\G *************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.223.101
Master_User: liyao
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000008
Read_Master_Log_Pos: 261
Relay_Log_File: template-relay-bin.000002
Relay_Log_Pos: 253
Relay_Master_Log_File: mysql-bin.000008
Slave_IO_Running: Yes
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: 261
Relay_Log_Space: 412
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: 255
1 row in set (0.00 sec)