Haproxy 是一个开源的负载均衡和反向代理软件，其提供了高可用的网络服务。其一般是应用于web服务，但同时也能为SMTP和终端服务等提供可靠的支持。
1、下载安装haproxy
wget ftp://195.220.108.108/linux/centos/6.8/os/x86_64/Packages/haproxy-1.5.4-3.el6.x86_64.rpm --下载
rpm -ivh haproxy-1.5.-.el6.x86_64.rpm -安装
2、配置Haproxy
cp /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.bak
vi /etc/haproxy/haproxy.cfg -c：Only checks config file and exits with code 0 if no error was found, or exits with code 1 if a syntax error was found.
/usr/local/haproxy/sbin/haproxy -c -f /etc/haproxy/haproxy.cfg 检查配置文件
Configuration file is valid
/etc/haproxy/haproxy.cfg文件
更多关于Haproxyacl配置请参考博文：http://blog.csdn.net/tantexian/article/details/50015975
global
log 127.0.0.1 local0 info
chroot /containers/loadbalancer/lb-gxevnalt/
stats socket /containers/loadbalancer/lb-gxevnalt/stats.sock
user haproxy
group haproxy
maxconn
tune.maxaccept
daemon defaults
option dontlognull
retries
option redispatch
maxconn
timeout client 50s
timeout server 50s
timeout connect 5s listen lb-gxevnalt_80 0.0.0.0:
mode http
balance leastconn
log global
log-format "%Tl",%{+Q}ci,"%fi:%fp",%{+Q}bi,%{+Q}r,%ST,%B,%{+Q}hr,%Tt
option forwardfor
option http-server-close
capture request header Host len
capture request header User-Agent len
capture request header Referer len
capture request header Cookie len
timeout http-request 10s
timeout http-keep-alive 55s
server lb-gxevnalt_80_i-calrmvwp_80 10.53.0.86: cookie i-calrmvwp_80 weight check inter rise fall
server lb-gxevnalt_80_i-jkhngdlw_80 10.53.0.87: cookie i-jkhngdlw_80 weight check inter rise fall
acl aaa_com hdr(host) -m str aaa.com
acl www_aaa_com hdr(host) -m str www.aaa.com
redirect prefix http://shop.aaa.com code 301 if aaa_com or www_aaa_com listen lb-gxevnalt_443 0.0.0.0:
mode tcp
balance leastconn
no log
timeout client 60s
timeout server 60s
server lb-gxevnalt_443_i-calrmvwp_443 10.53.0.86: weight check inter rise fall
server lb-gxevnalt_443_i-jkhngdlw_443 10.53.0.87: weight check inter rise fall
假若想访问监控界面：配置stats uri /haproxy项，重启服务：
设置防火墙：
iptables -I INPUT -p tcp --dport -j ACCEPT
service iptables save
service iptables restart
监控界面：
3、开机启动
chkconfig haproxy on
service haproxy start
或
/usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg