运维进行时

一、前言
       Haproxy是稳定、高性能、高可用性的负载均衡解决方案，支持HTTP及TCP代理后端服务器池，因支持强大灵活的7层acl规则，广泛作为HTTP反向代理。本文则详细介绍如何利用它的四层交换与Keepalived实现一个负载均衡器，适用于Socket、ICE、Mail、Mysql、私有通讯等任意TCP服务。系统架构图如下：



二、平台环境

三、平台安装配置
1、添加非本机IP邦定支持

2、配置平台日志支持

3、关闭SELINUX

4、配置iptables，添加VRRP通讯支持

5、Keepalived的安装、配置


#vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived global_defs {    notification_email {          liutiansi@gmail.com    }    notification_email_from liutiansi@gmail.com    smtp_connect_timeout 3    smtp_server 127.0.0.1    router_id LVS_DEVEL } vrrp_script chk_haproxy {     script "killall -0 haproxy"     interval 2     weight 2 } vrrp_instance VI_1 {     interface eth1     state MASTER # 从为BACKUP     priority 101 # 从为100     virtual_router_id 50 #路由ID，可通过#tcpdump vrrp查看。     garp_master_delay 1 #主从切换时间，单位为秒。     authentication {         auth_type PASS         auth_pass KJj23576hYgu23IP     }     track_interface {        eth0        eth1     }     virtual_ipaddress {         192.168.0.100     }     track_script {         chk_haproxy     }     #状态通知     notify_master "/etc/keepalived/Mailnotify.py master"     notify_backup "/etc/keepalived/Mailnotify.py backup"     notify_fault "/etc/keepalived/Mailnotify.py fault" }
6、Haproxy的安装与配置

#vi /usr/local/haproxy/etc/haproxy.cfg
# this config needs haproxy-1.1.28 or haproxy-1.2.1 global #        log 127.0.0.1   local0         log 127.0.0.1   local1 notice         maxconn 5000         uid 99         gid 99         daemon         pidfile /usr/local/haproxy/haproxy.pid defaults         log     global         mode    http         #option httplog         option  dontlognull         retries 3         option redispatch         maxconn 2000         contimeout      5000         clitimeout      50000         srvtimeout      50000 listen  ICE01   192.168.0.100:11231         mode tcp #配置TCP模式         maxconn 2000         balance roundrobin         server  ice-192.168.0.128 192.168.0.128:11231 check inter 5000 fall 1 rise 2         server  ice-192.168.0.129 192.168.0.129:11231 check inter 5000 fall 1 rise 2         server  ice-192.168.0.130 192.168.0.130:11231 check inter 5000 fall 1 rise 2         server  ice-192.168.0.131 192.168.0.131:11231 check inter 5000 fall 1 rise 2         server  ice-192.168.0.132 192.168.0.132:11231 check inter 5000 fall 1 rise 2         server  ice-192.168.0.34 192.168.0.34:11231 check inter 5000 fall 1 rise 2         srvtimeout      20000 listen stats_auth 192.168.0.20:80 # listen stats_auth 192.168.0.21:80 # backup config         stats enable         stats uri  /admin-status #管理地址         stats auth  admin:123456 #管理帐号:管理密码         stats admin if TRUE
7、邮件通知程序(python实现)
#vi /etc/keepalived/Mailnotify.py
#!/usr/local/bin/python #coding: utf-8 from email.MIMEMultipart import MIMEMultipart from email.MIMEText import MIMEText from email.MIMEImage import MIMEImage from email.header import Header import sys import smtplib #--------------------------------------------------------------- # Name:        Mailnotify.py # Purpose:     Mail notify to SA # Author:      Liutiansi # Email:       liutiansi@gamil.com # Created:     2011/03/09 # Copyright:   (c) 2011 #-------------------------------------------------------------- strFrom = 'admin@domain.com' strTo = 'liutiansi@gmail.com' smtp_server='smtp.domain.com' smtp_pass='123456' if sys.argv[1]!="master" and sys.argv[1]!="backup"  and sys.argv[1]!="fault":     sys.exit() else:     notify_type=sys.argv[1] mail_title='[紧急]负载均衡器邮件通知' mail_body_plain=notify_type+'被激活，请做好应急处理。' mail_body_html='<b><font color=red>'+notify_type+'被激活，请做好应急处理。</font></b>' msgRoot = MIMEMultipart('related') msgRoot['Subject'] =Header(mail_title,'utf-8') msgRoot['From'] = strFrom msgRoot['To'] = strTo msgAlternative = MIMEMultipart('alternative') msgRoot.attach(msgAlternative) msgText = MIMEText(mail_body_plain, 'plain', 'utf-8') msgAlternative.attach(msgText) msgText = MIMEText(mail_body_html, 'html','utf-8') msgAlternative.attach(msgText) smtp = smtplib.SMTP() smtp.connect(smtp_server) smtp.login(smtp_user,smtp_pass) smtp.sendmail(strFrom, strTo, msgRoot.as_string()) smtp.quit()
注：修改成系统python实际路径“#!/usr/local/bin/python”(第一行)
#chmod +x /etc/keepalived/Mailnotify.py
#/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/etc/haproxy.cfg
#service keepalived start

8、查看VRRP通讯记录
#tcpdump vrrp

四、Haproxy界面
访问http://192.168.0.20/admin-status，输入帐号admin密码123456进入管理监控平台。

haproxy-1.4.9以后版本最大的亮点是添加了手工启用/禁用功能，对升级变更应用时非常有用。

五、邮件通知


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