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。
安装haproxy
tar zxvf haproxy-1.4.14.tar.gz
cd haproxy-1.4.14
uname -a //查看linux内核版本
make TARGET=linux26 PREFIX=/usr/local/haproxy
make install PREFIX=/usr/local/haproxy
HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for web sites crawling under very high loads while needing persistence or Layer7 processing. Supporting tens of thousands of connections is clearly realistic with todays hardware. Its mode of operation makes its integration into existing architectures very easy and riskless, while still offering the possibility not to expose fragile web servers to the Net, such as below.
更新日志：
- [MINOR] config: fix endianness of server check port
- [BUG] http: fix possible incorrect forwarded wrapping chunk size (take 2)
- [MINOR] tools: add two macros MID_RANGE and MAX_RANGE
- [BUG] http: fix content-length handling on 32-bit platforms
- [OPTIM] buffers: uninline buffer_forward()
下载地址：
http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.14.tar.gz
http://haproxy.1wt.eu/download/1.4/bin/haproxy-1.4.14-pcre-40kses-linux-i586.stripped.gz