软负载均衡之haproxy(一)
实际生产环境中架构用到IIS+haproxy+keepalived+nginx,需要综合整理学习一下。折腾半天haproxy，大面上配通，细节上还有很多需要整理。
环境：
前端:haproxyIP:192.168.71.128
后端WEB：
server01：apache192.168.71.138（Linux）
http://192.168.71.138
server02：apache192.168.71.135（windows）
http://192.168.71.135
试验目的：
前端haproxy为后端两台Web服务器做负载均衡及灾备冗余。
2015-1-31
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1.vim /etc/rsyslog.conf
local2* /var/log/haproxy.log
2.vim /etc/sysconfig/rsyslog
SYSLOGD_OPTIONS="-c 2"
service rsyslog restart
3.vim /etc/haproxy/haproxy.conf
global
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 40000
user haproxy
group haproxy
daemon
# 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
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
mode http
bind *:1080
stats enable
stats hide-version
stats uri /haproxyadmin?stats
stats realm Haproxy\ Statistics
stats auth admin:admin
stats admin if TRUE
frontend web
bind *:8080
mode http
log global
option logasap
option dontlognull
capture request header Host len 20
capture request header Referer len 60
default_backend servers
backend servers
balance roundrobin
server websvr1 219.142.x.x:80 check maxconn 2000
server websvr2 219.142.x.x:80 check maxconn 2000
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