1、安装HAproxy
yum -y install haproxy
2、编辑配置文件
#---------------------------------------------------------------------
# Example configuration for a possible web application. See the
# full configuration options online.
#
# http://haproxy.1wt.eu/download/1.4/doc/configuration.txt
#
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog
#
# 2) configure local2 events to go to the /var/log/haproxy.log
# file. A line like the following can be added to
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2 #定义日志
chroot /var/lib/haproxy #定义haproxy的家目录，
pidfile /var/run/haproxy.pid #定义pid
maxconn 4000 #设置最大并发连接数
user haproxy #用户名
group haproxy #用户组
daemon #以守护进程模式运行
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults #默认参数
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
listen stats #状态信息
mode http
bind *:1080 #绑定端口
stats enable #开启或者关闭
stats hide-version #关闭版本信息
stats uri /haproxy?admin #web状态界面的url
stats realm Haproxy\ Statistics #
stats auth admin:admin #认证的用户名：密码
stats admin if TRUE #如果认证成功开启admin
frontend http-in #前端配置
bind *:80 #前端绑定端口
mode http #http
log global #全局日志
option httpclose #
option logasap
capture request header Host len 20
capture request header Referer len 60
default_backend http-server
backend http-server #后端web服务集群
balance roundrobin #调度算法模式
server web1 192.168.10.150:81 check maxconn 4000 #后端web列表
server web2 192.168.10.122:80 check maxconn 3000
作者：小沙弥Gavin
链接：https://www.jianshu.com/p/99e2bdddcfff
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