Haproxy 是一個開源的負載均衡和反向代理軟件，其提供了高可用的網絡服務。其一般是應用於web服務，但同時也能為SMTP和終端服務等提供可靠的支持。
1、下載安裝haproxy
wget ftp://195.220.108.108/linux/centos/6.8/os/x86_64/Packages/haproxy-1.5.4-3.el6.x86_64.rpm --下載 rpm -ivh haproxy-1.5.4-3.el6.x86_64.rpm -安裝
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 檢查配置文件
Configuration file is valid
/etc/haproxy/haproxy.cfg文件
更多關於Haproxyacl配置請參考博文：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 100000 tune.maxaccept 100000 daemon defaults option dontlognull retries 3 option redispatch maxconn 100000 timeout client 50s timeout server 50s timeout connect 5s listen lb-gxevnalt_80 0.0.0.0:80 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 255 capture request header User-Agent len 255 capture request header Referer len 255 capture request header Cookie len 255 timeout http-request 10s timeout http-keep-alive 55s server lb-gxevnalt_80_i-calrmvwp_80 10.53.0.86:80 cookie i-calrmvwp_80 weight 10 check inter 3000 rise 3 fall 5 server lb-gxevnalt_80_i-jkhngdlw_80 10.53.0.87:80 cookie i-jkhngdlw_80 weight 10 check inter 3000 rise 3 fall 5 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 0.0.0.0:443 mode tcp balance leastconn no log timeout client 60s timeout server 60s server lb-gxevnalt_443_i-calrmvwp_443 10.53.0.86:443 weight 10 check inter 5000 rise 3 fall 5 server lb-gxevnalt_443_i-jkhngdlw_443 10.53.0.87:443 weight 10 check inter 5000 rise 3 fall 5
假若想訪問監控界面：配置stats uri /haproxy項，重啟服務：
設置防火牆：
iptables -I INPUT -p tcp --dport 5000 -j ACCEPT service iptables save service iptables restart
監控界面：
3、開機啟動
chkconfig haproxy on
service haproxy start
或
/usr/local/haproxy/sbin/haproxy -f /etc/haproxy/haproxy.cfg