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Haproxy、Keepalived双主高可用负载均衡
一、Haproxy和Keepalived简介
1、Haproxy
HAProxy提供高可用性、负载均衡以及基于TCP和HTTP应用的代理,支持虚拟主机。它是免费、快速并且可靠的一种解决方案。特别适用于那些负载特大的web站点,这些站点通常又需要会话保持或七层处理。HAProxy运行在当前的硬件上,完全可以支持数以万计的并发连接。并且它的运行模式使得它可以很简单安全的整合进您当前的架构中, 同时可以保护你的web服务器不被暴露到网络上。
2、Keepalived
keepalived是一个类似于layer3, 4 & 7交换机制的软件,也就是我们平时说的第3层、第4层和第7层交换,检测web服务器的状态,如果有一台web服务器死机,或工作出现故障,Keepalived将检测到,并将有故障的web服务器从系统中剔除,当web服务器工作正常后Keepalived自动将web服务器加入到服务器群中,这些工作全部自动完成,不需要人工干涉,需要人工做的只是修复故障的web服务器。
二、实验架构图
三、实验环境
OS:centos6.5x86_64
apache:httpd-2.2.15-29.el6.centos.x86_64
haproxy:haproxy-1.4.24-2.el6.x86_64
keepalived:keepalived-1.2.7-3.el6.x86_64
四、实验目的
1、Haproxy+Keepalived双主双机高可用模型,keepalived为Haproxy主从提供高可用保证haproxy-master若挂掉haproxy-backup能无缝接管,haproxy为后端Web提供负载均衡,缓解并发压力,实现WEB站点负载均衡+高可用性;
2、Haproxy反代web做动静分离;
五、实验配置
1、前端配置
(1)Haproxy1配置
首先配置Keepalived
[root@localhost ~]# yum install keepalived -y [root@localhost ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { //指定Keepalived在发送生事件时,需要发送email到的对象 rootr@localhost hyd@localhost } notification_email_from warning@localhost smtp_server 127.0.0.1 #指定发送email的smtp服务器 smtp_connect_timeout 30 router_id LVS_DEVEL_hyd #运行Keepalived的机器的一个标识 } vrrp_script chk_haproxy { #检测Haprox服务状态 script "killall -0 haproxy" #服务探测,返回0说明服务是正常的 interval 1 weight 2 #Haproxy上线,权重加2;下线,权重减2 } vrrp_instance VI_1 { #双主实例1 state MASTER #haproxy1(172.16.6.1)为主,haproxy 2(172.16.6.2)为备 interface eth0 virtual_router_id 60 #实例1的VRID为60 garp_master_delay 1 #在切换到master状态后,延迟进行gratuitous ARP请求 priority 100 #主(172.16.6.1)的优先级为100,从的(172.16.6.2)优先级为99 advert_int 1 #查询间隔 authentication { auth_type PASS # 认证方式,支持PASS和AH auth_pass 123456 } virtual_ipaddress { #漂移地址 实例1的vip 172.16.6.100/16 dev eth0 } track_interface {#设置额外的监控,里面任意一个出现问题,都会进入fault状态 eth0 } track_script { chk_haproxy #追踪脚本 } #通知脚本 notify_master "/etc/keepalived/notify.sh master" notify_backup "/etc/keepalived/notify.sh backup" notify_fault "/etc/keepalived/notify.sh fault" } vrrp_instance VI_2 { state BACKUP #实例2在haproxy1(172.16.6.1)上是备,在haproxy(172.16.6.2)上是主 interface eth0 virtual_router_id 120 garp_master_delay 1 priority 200 z#实例2在hapeoxy1上的优先级是200,在haproxy 2上的优先级是201 advert_int 1 authentication { auth_type PASS auth_pass 123456 } virtual_ipaddress { 172.16.6.200/16 dev eth0 } track_interface { eth0 } track_script { chk_haproxy }
为Keepalived提供脚本
[root@localhost ~]# vim /etc/keepalived/notify.sh #!/bin/bash # Author: MageEdu <linuxedu@foxmail.com> 脚本使用请注明出处 # description: An example of notify script # vip=172.16.6.100 contact=‘root@localhost‘ notify() { mailsubject="`hostname` to be $1: $vip floating" mailbody="`date ‘+%F %H:%M:%S‘`: vrrp transition, `hostname` changed to be $1" echo$mailbody | mail -s "$mailsubject"$contact } case"$1"in master) notify master /etc/rc.d/init.d/haproxystart exit0 ;; backup) notify backup /etc/rc.d/init.d/haproxystop exit0 ;; fault) notify fault /etc/rc.d/init.d/haproxystop exit0 ;; *) echo‘Usage: `basename $0` {master|backup|fault}‘ exit1 ;; esac
赋予执行权限 chmod +x /etc/keepalived/notify.sh
接着配置Haproxy
[root@localhost ~]# yum -y install haproxy [root@localhost ~]# vim /etc/haproxy/haproxy.cfg global log 127.0.0.1 local2 chroot /var/lib/haproxy #chroot运行的路径,增加安全性 pidfile /var/run/haproxy.pid maxconn 4000 #默认最大连接数 user haproxy group haproxy daemon #守护进程运行 # 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 mode http #指定haproxy的工作模式为http log global option httplog option dontlognull option http-server-close #当客户端超时时,允许服务器关闭连接 option forwardfor except 127.0.0.0/8 #传递客户端ip option redispatch #在使用了基于cookie的会话保持的时候,通常需要加这么一项,一旦后端某一server宕机时,能够将其会话重新派发到其它的upstream servers 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 frontend proxy *:80 #前端代理 acl url_static path_beg -i /static /images /javascript /stylesheets acl url_static path_end -i .jpg .gif .png .css .js acl dynamic_content path_end -i .php use_backend static if url_static default_backend dynamic #--------------------------------------------------------------------- # static backend for serving up images, stylesheets and such #--------------------------------------------------------------------- backend static #后端静态服务器 balance roundrobin server web1 172.16.6.10:80 inter 3000 rise 2 fall 3 check maxconn 5000 #--------------------------------------------------------------------- # round robin balancing between the various backends #--------------------------------------------------------------------- backend dynamic #后端动态服务器 balance roundrobin server web2 172.16.6.20:80 inter 3000 rise 2 fall 3 check maxconn 5000 listen statistics #启用stats查看,认证等功能:默认在/haproxy?stats mode http bind *:8080 #监听的地址和端口 stats enable #开启stats功能 stats auth admin:admin 登陆用户名和密码 stats uri /admin?stats #指定uri访问路径 stats hide-version #隐藏软件版本号 stats admin if TRUE #如果认证通过了就允许管理 stats refresh 5s #页面自动刷新间隔 acl allow src 172.16.0.0/16 #定义访问控制列表 tcp-request content accept if allow tcp-request content reject
(2)Haproxy2配置
与Haproxy1大致相同,不同地方会提醒大家哦!!!
首先配置Keepalived
[root@localhost ~]# yum install keepalived -y [root@localhost ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { rootr@localhost hyd@localhost } notification_email_from warning@localhost smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL_hyd } vrrp_script chk_haproxy { script "killall -0 haproxy" interval 1 weight 2 } vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 120 #使用VRID将路由器进行分组,具有相同VRID值的路由器为同一个组 garp_master_delay 1 priority 201# advert_int 1 authentication { auth_type PASS auth_pass 123456 } virtual_ipaddress { 172.16.6.200/16 dev eth0 } track_interface { eth0 } track_script { chk_haproxy } notify_master "/etc/keepalived/notify.sh master" notify_backup "/etc/keepalived/notify.sh backup" notify_fault "/etc/keepalived/notify.sh fault" } vrrp_instance VI_2 { state BACKUP interface eth0 virtual_router_id 60 garp_master_delay 1 priority 99 advert_int 1 authentication { auth_type PASS auth_pass 123456 } virtual_ipaddress { 172.16.6.100/16 dev eth0 } track_interface { eth0 } track_script { chk_haproxy }
脚本同Haproxy1的相同,只需把脚本里的vip改为172.16.6.200。
接着配置Haproxy
因为Haproxy1的Haproxy与Haproxy2的Haproxy是相同的,都是将服务代理至后端服务器,可以直接使用Haproxy1的Haproxy的配置。
[root@localhost ~]# scp /etc/haproxy/haproxy.cfg root@172.16.6.2:/etc/haproxy/
(3)启动Keepalived,Haproxy并测试,测试Keepalived高可用
Haproxy1 Haproxy2 启动Keepalived,Haproxy
[root@localhost ~]# service keepalived start [root@localhost ~]# service haproxy start
对于Haproxy1,效果如下
对于Haproxy2,效果如下
关闭Haproxy1的Haproxy服务测试,vip飘移
查看Haproxy2,接收到了Haproxy1飘过来的vip
2、后端配置
(1)配置web1, 配置静态页面
[root@station36 html]# cd /var/www/html [root@station36 html]# vim index.html <h1> static web station 172.16.6.10 </h1> [root@station36 html]# service httpd start
(2)配置web2, 配置页动态页面
[root@localhost ~]# yum install php -y [root@localhost ~]# cd /var/www/html [root@localhost html]# vim index.php <h1> static web station 172.16.6.20 <?php phpinfo(); ?> </h1>
(3)Haproxy动静分离机制
请求静态内容
首先在web1(172.16.6.10)的网页目录下放入hyd.jpg
请求静态内容:访问172.16.6.200/hyd.jpg
请求动态内容:访问172.16.6.200
Haproxy统计页面的输出
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