Haproxy配置http模式负载均衡
环境准备：主机名角色IP地址mylinux1.contoso.comhaproxy服务器 eth0:192.168.100.121
eth1:172.16.100.121
mylinux3.contoso.comweb服务器1eth0:192.168.100.181mylinux4.contoso.comweb服务器2eth0:192.168.100.182 一、准备工作
在mylinux3和mylinux4上安装http服务，并启动。
yum -y install httpd
/etc/init.d/httpd start 使用浏览器访问，保证服务正常。
http://s2.运维网.com/wyfs02/M02/88/53/wKiom1fuhQmh288NAADy93YhLng059.png-wh_500x0-wm_3-wmp_4-s_1464646156.png
http://s3.运维网.com/wyfs02/M00/88/53/wKiom1fuhQuxrI8JAADzYvilmMU794.png-wh_500x0-wm_3-wmp_4-s_4201185.png
二、修改haproxy配置文件
# cp haproxy.cfg haproxy.cfg.bak
# vi haproxy.cfg
# cat haproxy.cfg
# this config needs haproxy-1.1.28 or haproxy-1.2.1
global
#log 127.0.0.1local0
log 127.0.0.1:514local0warning
pidfile /usr/local/haproxy/var/run/haproxy.pid
daemon
maxconn 4096
chroot /usr/local/haproxy/var/chroot
user haproxy
group haproxy
nbproc 1
defaults
log global
mode http #默认的模式{tcp|http|health}，tcp是4层，http是7层，health只会返回OK
retries 3
optionhttplog #日志类别，采用httplog
optionhttpclose #每次请求完毕后主动关闭http通道,haproxy不支持keep-alive,只能模拟这种模式的实现
optiondontlognull #不记录健康检查日志信息
optionforwardfor #如果后端服务器需要获得客户端真实ip需要配置的参数，可以从Http Header中获得客户端ip
optionredispatch #当serverId对应的服务器挂掉后，强制定向到其他健康的服务器
maxconn 2000
balance roundrobin #设置默认负载均衡方式，轮询方式
timeout connect 5000
timeout client50000
timeout server50000
listenhaproxy_stats
bind *:8000 #绑定到本地所有IP地址的8000端口上
mode http #http的7层模式
option httplog #采用http日志格式
maxconn 20 #默认的最大连接数
stats enable #启用状态监控
stats refresh 30s #监控页面自动刷新时间
stats uri /haproxy_status #监控页面url
stats auth admin:123456 #设置监控页面的用户名和密码，可以设置多个用户名
stats hide-version #隐藏监控页面上的Haproxy版本信息
listenwebsites
bind192.168.100.121:80 #绑定到192.168.100.121上的80端口
timeoutserver15s
timeoutconnect 30s
servermylinux3192.168.100.181:80 check port 80 inter 2000 fall 3 #检测健康端口80，检测心跳频率是2000ms，失败3次则认为服务器不可用
servermylinux4192.168.100.182:80 check port 80 inter 2000 fall 3 三、启动haproxy并测试
1、启动haproxy
# /usr/local/haproxy/sbin/haproxy -f haproxy.cfg -c
Configuration file is valid
# /usr/local/haproxy/sbin/haproxy -f haproxy.cfg -D
# ps -ef|grep haproxy
haproxy 2575 10 23:24 ? 00:00:00 /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/conf/haproxy.cfg
root 2584 10150 23:45 pts/1 00:00:00 grep haproxy 2、测试haproxy监控页面
http://s2.运维网.com/wyfs02/M02/88/4F/wKioL1fuiWvBVDPpAAEtqdh0S0k694.png-wh_500x0-wm_3-wmp_4-s_174461752.png
http://s1.运维网.com/wyfs02/M01/88/53/wKiom1fuiXHyE2qhAAIfxrAK7KU014.png-wh_500x0-wm_3-wmp_4-s_2979580383.png
3、web访问测试
http://s5.运维网.com/wyfs02/M01/88/53/wKiom1fujHnQT3jOAAD9Y4Whgq0724.png-wh_500x0-wm_3-wmp_4-s_676147680.png
http://s1.运维网.com/wyfs02/M01/88/4F/wKioL1fujHywU8FkAAECdwUV8HM915.png-wh_500x0-wm_3-wmp_4-s_1305355213.png
4、后端节点负载测试
首先使用curl测试一下获取网页内容：
# curl -s http://192.168.100.121
Web1
Web Site 1
mylinux3.contoso.com
# curl -s http://192.168.100.121
Web2
Web Site 2
mylinux4.contoso.com
然后使用for循环测试100次，并将100次的结果全部追加到一个文件中去，最后检查每个节点出现的次数：
# for i in {1..100};do curl http://192.168.100.121/ >>/tmp/webtest.txt;done
# grep mylinux3.contoso.com /tmp/webtest.txt |wc -l
50
# grep mylinux4.contoso.com /tmp/webtest.txt |wc -l
50 结果是mylinux3和mylinux4都访问了50次，证明轮询方式下负载是一样的。
四、haproxy启动停止脚本
#!/bin/bash
#
###################################################
#chkconfig: 2345 20 70
#description: Start and stop haproxy service.
#Author: Jerry ZhaoQQ:1217406852
#Date: 2016-09-30 19:46:42 Friday
###################################################
BASE=/usr/local/haproxy
PROG=$BASE/sbin/haproxy
PIDFILE=$BASE/var/run/haproxy.pid
CONFFILE=$BASE/conf/haproxy.cfg
RUNNING_STATUS=`ps -ef|grep "haproxy -f"|egrep -v grep|wc -l`
start(){
RUNNING_STATUS=`ps -ef|grep "haproxy -f"|egrep -v grep|wc -l`
if [ $RUNNING_STATUS -ge 1 ];then
echo "Haproxy is already running! Exit now."
exit 1
else
$PROG -f $CONFFILE
[ $? -eq 0 ] && echo "Start haproxy successful." || echo "Start haproxy failed."
fi
}
stop(){
if [ $RUNNING_STATUS -lt 1 ];then
echo "Haproxy is not running. Stop haproxy failed!"
else
kill -9 $(cat $PIDFILE)
[ $? -eq 0 ] && echo "Stop haproxy successful." || echo "Stop haproxy failed."
rm -rf $PIDFILE
fi
}
reload(){
if [ ! -f $PIDFILE ];then
echo "No pid file found. Maybe you need to check haproxy status first."
exit 1
else
$PROG -f $CONFFILE -sf $(cat $PIDFILE)
fi
}
status(){
if [ $RUNNING_STATUS -ge 1 ];then
PID_NUM=`cat $PIDFILE`
echo "Haproxy (pid$PID_NUM) is running..."
else
echo "Haproxy is stopped."
fi
}
check(){
$PROG -f $CONFFILE -c
}
case $1 in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
reload)
reload
;;
status)
status
;;
check)
check
;;
*)
echo "USAGE: $0 start|stop|restart|reload|check ."
exit 1
;;
esac
测试一下：
# cp haproxy /etc/init.d/
# ll /etc/init.d/haproxy
-rwxr-xr-x 1 root root 1567 Oct1 00:06 /etc/init.d/haproxy
# service haproxy status
Haproxy (pid2575) is running...
# service haproxy stop
Stop haproxy successful.
# service haproxy start
Start haproxy successful.
# service haproxy restart
Stop haproxy successful.
Start haproxy successful.
# service haproxy status
Haproxy (pid2796) is running...
# service haproxy reload
# service haproxy status
Haproxy (pid2822) is running...
# service haproxy check
Configuration file is valid
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