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http://blog.liuts.com/post/223/
基于Keepalived+Haproxy搭建四层负载均衡器[原创]
刘天斯 , 2011/03/10 18:17 , Haproxy , 评论(28) , 阅读(18553) ,Via 本站原创一、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OS:Centos5.4(64X)
MASTER:192.168.0.20
BACKUP:192.168.0.21
VIP:192.168.0.100
Serivce Port:11231
三、平台安装配置
1、添加非本机IP邦定支持
#vi /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind=1
#sysctl –p
2、配置平台日志支持
#vi /etc/syslog.conf
添加：
local3.* /var/log/haproxy.log
local0.* /var/log/haproxy.log
#vi /etc/sysconfig/syslog
修改：
SYSLOGD_OPTIONS="-r -m 0"
#/etc/init.d/syslog restart
3、关闭SELINUX
vi /etc/sysconfig/selinux
修改：
SELINUX=disabled
#setenforce 0
4、配置iptables，添加VRRP通讯支持
iptables -A INPUT -d 224.0.0.18 -j ACCEPT
5、Keepalived的安装、配置
#mkdir -p /home/install/keepalivedha
#cd /home/install/keepalivedha
#wget http://www.keepalived.org/software/keepalived-1.2.2.tar.gz
#tar zxvf keepalived-1.2.2.tar.gz
#cd keepalived-1.2.2
#./configure
#make && make install
#cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
#cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
#mkdir /etc/keepalived
#cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
#cp /usr/local/sbin/keepalived /usr/sbin/
#vi /etc/keepalived/keepalived.conf
view plainprint?
- ! 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
#cd /home/install/keepalivedha
#wget http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.11.tar.gz
#tar -zxvf haproxy-1.4.11.tar.gz
#cd haproxy-1.4.11
#make install
#mkdir -p /usr/local/haproxy/etc
#mkdir -p /usr/local/haproxy/sbin
#cp examples/haproxy.cfg /usr/local/haproxy/etc
#ln -s /usr/local/sbin/haproxy /usr/local/haproxy/sbin/haproxy
#vi /usr/local/haproxy/etc/haproxy.cfg
view plainprint?
- # 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
view plainprint?
- #!/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
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
15:49:05.270017 IP 192.168.0.20 > VRRP.MCAST.NET: VRRPv2, Advertisement, vrid 50, prio 100, authtype simple, intvl 1s, length 20
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
如大家有什么疑问或感兴趣的话题可以通过weibo与我交流：http://t.qq.com/yorkoliu
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