刚配置的MySQL主从，在从机上看到
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mysql> SHOW slave STATUS \\G
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*************************** 1. row ***************************
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Slave_IO_State: Connecting to master
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Master_Host: 172.17.210.199
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Master_User: my
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Master_Port: 3306
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Connect_Retry: 60
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Master_Log_File: masters-bin.000003
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Read_Master_Log_Pos: 1224
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Relay_Log_File: testmysql-relay-bin.000001
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Relay_Log_Pos: 4
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Relay_Master_Log_File: masters-bin.000003
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Slave_IO_Running: Connecting
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Slave_SQL_Running: Yes
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Replicate_Do_DB:
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Replicate_Ignore_DB:
看日志有很多：
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141010 0:02:48 [ERROR] Slave I/O: error connecting to master \'my@172.17.210.199:3306\' - retry-time: 60 retries: 1, Error_code: 2003
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141010 0:03:48 [ERROR] Slave I/O: error connecting to master \'my@172.17.210.199:3306\' - retry-time: 60 retries: 2, Error_code: 2003
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141010 0:04:48 [ERROR] Slave I/O: error connecting to master \'my@172.17.210.199:3306\' - retry-time: 60 retries: 3, Error_code: 2003
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141010 0:05:48 [ERROR] Slave I/O: error connecting to master \'my@172.17.210.199:3306\' - retry-time: 60 retries: 4, Error_code: 2003
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141010 0:06:48 [ERROR] Slave I/O: error connecting to master \'my@172.17.210.199:3306\' - retry-time: 60 retries: 5, Error_code: 2003
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141010 0:07:48 [ERROR] Slave I/O: error connecting to master \'my@172.17.210.199:3306\' - retry-time: 60 retries: 6, Error_code: 2003
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解决方法：
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导致lave_IO_Running 为connecting 的原因主要有以下 3 个方面：
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1、网络不通
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2、密码不对
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3、pos不对
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解决步骤：
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1、对于第一个问题，一般情况下都是可以排除的，也是最容易排除的。
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2、在主库上修改用来复制的用户的密码。
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3、 在做chang to 的时候注意log_pos 是否跟此时主机的一样。在主机上 show master status \G ;可以查看到
mysql> show master status \G;
*************************** 1. row ***************************
File: masters-bin.000003
Position: 2392
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
ERROR:
No query specified
从机上面执行change to 的正确
CHANGE MASTER TO
MASTER_HOST='172.17.210.199',
MASTER_USER='my',
MASTER_PASSWORD='123456',
MASTER_LOG_FILE='masters-bin.000003',
MASTER_LOG_POS= 2392;
我的问题，就是主机的防火墙没有关闭，犯了一个低级错误！！！！
本文题目：MySQL5.6主从Slave_IO_Running:Connecting/errorconnectingtomaster*-retry
标题网址：
http://cdkjz.cn/article/ggdphh.html
