4,7层负载均衡软件Haproxy 1.5.6发布。 2014-10-19 上个版本是2014-10-09的1.5.5. Very few fixes this time, 1.5.6 fixes the annoying bug reported this week about disabled proxies, an issue in the URI hash (the question mark of a query string was accidently hashed when present), an off-by-one when checking the stick-counter number in "track-sc" rules, resulting in the "track-sc3" action being accepted and reported as valid but ignored, and slightly improves the systemd wrapper. 完全改进： 2014/10/18 : 1.5.6 - BUG/MEDIUM: systemd: set KillMode to 'mixed' - MINOR: systemd: Check configuration before start - BUG/MEDIUM: config: avoid skipping disabled proxies - BUG/MINOR: config: do not accept more track-sc than configured - BUG/MEDIUM: backend: fix URI hash when a query string is present HAProxy提供高可用性、负载均衡以及基于TCP和HTTP应用的代理，支持虚拟主机， 它是免费、快速并且可靠的一种解决方案。HAProxy特别适用于那些负载特大的web站点， 这些站点通常又需要会话保持或七层处理。HAProxy运行在当前的硬件上，完全可以支持数以万计的并发连接。并且它的运行模式使得它可以很简单安全的整 合进您当前的架构中， 同时可以保护你的web服务器不被暴露到网络上。 下图是HAProxy的架构：
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