mysql异常：Communications link failure
2016-09-22 10:30
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**1.问题发生原因
在Docker上运行的程序，突然之间报这个错误，但在本地测试正常。故先考虑的是否是容器问题，经检测，其他程序运行正常
最后发现是自己程序优化问题导致：程序与MySQL通讯失败了，即连接失败了。此为程序打开数据库连接后，等到做数据库操作时，发现连接被MySQL关闭掉了。而在MySQL这一层，MySQL5配置上默认将连接的等待时间（wait_timeout）缺省为8小时。连接超过8小时，会导致mysql认为这个连接超时无效，然后进行关闭。**
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