后端真机失效以后，连接记录依然存在。双TCP监控问题

Submitted by seedto on 周四, 2014-03-13 06:45

第一个问题，当真机失效以后，使用ipvsadm -lcn | grep x.x.x.x查看真机连接情况，发现先前的连接依然存在， 我观察了一下，要过一段时间才真正消失，这是什么原因，请帮忙解释一下。
第二个问题，我的环境是在终端服务器上，而且监控的程序是双TCP连接，也就是说当打开程序时，会创建两个连接，这就导致了，把两个TCP连接分散到两台真机上了，程序最终报错。但如果我把保持时间设置起来的话，前面我说了是在终端服务器上，导致每个用户打开程序都连接到一台服务器上，就无法负载匀衡了，哎。。。有没有什么好的办法呀？

Forums:

zhangzq

周三, 2014-06-04 04:36

通过分析LVS源码，解答如下：
1. 内核中连接的生存时间为15*60秒(TCP为例)，也就是说15*60秒内没有数据经过LVS时，LVS才将连接删除。
一旦有数据经过，内核中的相应连接将重新生存15*60秒。 所以真机失效后，最长等待15*60秒，连接就会删除。

2.当开启会话保持后，来自同一个IP地址的客户端请求，LVS会调度到同一台服务器（通常称为基于源地址的会话保持）。如果你想负载均衡，你必须把每个用户程序部署在不同IP地址的服务器上。

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