Haproxy配置多个HTTP代理服务器的指南

global
    # 最大并发2000
	maxconn 2000
	log /dev/log	local0
	log /dev/log	local1 notice
	chroot /var/lib/haproxy
	stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
	stats timeout 30s
	user haproxy
	group haproxy
	daemon

	# Default SSL material locations
	ca-base /etc/ssl/certs
	crt-base /etc/ssl/private
	
       # 日志配置，需要搭配rsyslog实现，日志等级local2
	log 127.0.0.1 local2

	# Default ciphers to use on SSL-enabled listening sockets.
	# For more information, see ciphers(1SSL). This list is from:
	#  https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
	# An alternative list with additional directives can be obtained from
	#  https://mozilla.github.io/server-side-tls/ssl-config-generator/?server=haproxy
	ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS
	ssl-default-bind-options no-sslv3

defaults
	log	global
	mode	http
	option	httplog
	option	dontlognull
        timeout connect 30s
        timeout client  30s
        timeout server  30s
	maxconn 2000

frontend http-proxy
    bind *:33128
    mode http
    # 以下3句只允许172.16.1.2访问，不允许其他来源ip访问
    acl allow_host src 172.16.1.2
    tcp-request content accept if allow_host
    tcp-request content reject
    default_backend	http-proxy-backend

backend http-proxy-backend
    mode http
    balance roundrobin
    option  redispatch
    # 超出最大请求数则排队30秒
    timeout queue 30s
    default-server check inter 1000 rise 1 fall 1 maxconn 2000
    server  http-proxy-1   172.16.1.11:3128 
    server  http-proxy-2   172.16.1.12:3128
    server  http-proxy-3   172.16.1.13:3128

# 监控面板，访问8404
listen stats
    bind *:8404
    stats enable
    stats uri /monitor
    stats refresh 5s

...

$ModLoad imudp
$UDPServerRun 514

local2.* /var/log/haproxy.log