LVS学习笔记（三）

淡淡回忆 · 发表于 2015-11-21 01:50:05

1.选用四台Linux机器做测试，全部都是同一版本的CentOS 5.2，为了简单其见关闭SELinux和防火墙功能：
1)vi /etc/sysconfig/selinux ，设置SELINUX=disabled 2)service iptables stop2.安装CentOS时不要选择安装Xen或集群，会有问题3.虚拟主机，一台Master，一台Backup，二台Real Server,IP地址分别是： Virtual IP：192.168.10.120 Master：192.168.10.118 Backup：192.168.10.118 Real Server1：192.168.10.117 Real Server2：192.168.10.1164.如果要做外部测试，请在路由器上设置路由，比如对外端口是8001，映射地址是Virtual IP，而不是Master或者Backup的地址5.Master和Backup都安装文章二的步骤安装ipvsadm和keepalived软件6.在Master主机上vi /etc/keepalived/keepalived.conf，添加如下内容： ! Configuration File for keepalivedglobal_defs {notification_email {test@gmail.com}notification_email_from lvsd@126.comsmtp_server smtp.126.comsmtp_connect_timeout 30router_id LVS_DEVEL}vrrp_instance VI_1 {state MASTER #如果在backup上面，改成BACKUPinterface eth0virtual_router_id 51priority 100 #如果在backup上面，改成99advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.10.120#192.168.10.121}}virtual_server 192.168.10.120 8001 {delay_loop 6lb_algo wrrlb_kind DRpersistence_timeout 50protocol TCPreal_server 192.168.10.117 8001 {weight 3TCP_CHECK{connect_timeout 10nb_get_retry 3delay_before_retry 3}}real_server 192.168.10.116 8001 {weight 1TCP_CHECK{connect_timeout 10nb_get_retry 3delay_before_retry 3}}} 7.在Master主机上vi /etc/rc.d/init.d/lvsd创建LVS Daemon程序，内容如下：#!/bin/bash# /etc/rc.d/init.d/lvsd## chkconfig 345 95 5# description:start or stop lvs daemon serviceVIP=192.168.10.120RIP1=192.168.10.117RIP2=192.168.10.116. /etc/rc.d/init.d/functionslogger $0 called with $1prog="lvsd"start(){#start ipvsadm/sbin/ipvsadm --set 30 5 60/sbin/ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.255 broadcast $VIP up/sbin/route add -host $VIP dev eth0:0/sbin/ipvsadm -A -t $VIP:8001 -s wrr -p 3/sbin/ipvsadm -a -t $VIP:8001 -r $RIP1:80 -g -w 1/sbin/ipvsadm -a -t $VIP:8001 -r $RIP2:80 -g -w 1touch /var/lock/subsys/ipvsdam > /dev/null 2>&1echo "ipvsadm start OK"#start keepalivedservice keepalived startecho "start $prog OK"}stop(){#stop keepalived firstservice keepalived stop#stop ipvsadm second/sbin/ipvsadm -C/sbin/ipvsadm -Zifconfig eth0:0 downroute del $VIPrm -rf /var/lock/subsys/ipvsadm > /dev/null 2>&1echo "ipvsadm stoped"echo "$prog stoped"}status(){if [ ! -e /var/lock/subsys/ipvsadm ]; thenecho "ipvsadm stoped"exit 1elseecho "ipvsadm OK"fiservice keepalived status}case "$1" instart)start;;stop)stop;;restart)stopstart;;status)status;;*)echo "Usage : service $prog {start|stop|restart|status}"exit 1esacexit 0 8.把lvsd添加到服务当中： 1）chkconfig --add lvsd 2）chkconfig --level 35 lvsd on，设置开机启动 3）chkconfig --list lvsd ，查看lvsd服务9.backup主机按上面进行同样的配置
10.在Real Server1上面执行vi /etc/rc.d/init.d/realserverd：#!/bin/bash## chkconfig 345 95 5# description : lvs real server daemonVIP=192.168.10.120. /etc/rc.d/init.d/functionsstart(){ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP/sbin/route add -host $VIP dev lo:0echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignoreecho "2" >/proc/sys/net/ipv4/conf/lo/arp_announceecho "1" >/proc/sys/net/ipv4/conf/all/arp_ignoreecho "2" >/proc/sys/net/ipv4/conf/all/arp_announcesysctl -p >/dev/null 2>&1echo "RealServer Start OK"}stop(){ifconfig lo:0 downroute del $VIP >/dev/null 2>&1echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignoreecho "0" >/proc/sys/net/ipv4/conf/lo/arp_announceecho "0" >/proc/sys/net/ipv4/conf/all/arp_ignoreecho "0" >/proc/sys/net/ipv4/conf/all/arp_announceecho "RealServer Stoped"}case "$1" instart)start;;stop)stop;;restart)stopstartstatus)*)echo "Usage:$0{start|stop|restart|status}"exit 1esacexit 0 　　11.把realserverd添加到服务当中：
1）chkconfig --add realserverd 2）chkconfig --level 35 realserverdon，设置开机启动 3）chkconfig --list realserverd，查看realserverd服务
12.vi /etc/httpd/conf/httpd.conf，把侦听商品改成8001
13.vi /var/www/html/index.html，添加如下内容：<html><head><title>Test Real Server1</title></head><body>Test Real Server 1<p>IP:192.168.10.117<p>Now Time:<mce:script type="text/javascript"></mce:script></body></html> 14.启动Apache服务器：service httpd start
15.启动realserverd服务：service realserverd start
16.Real Server2也按上述进行配置
14.启动lvsd服务：service lvsd start
15.在浏览器中输入http://192.168.10.120进行检测，并刷新网页看是否自动显示117或116不同ip的网页
16.关闭Master上面的lvsd服务：service lvsd stop，查看Backup是否能自动切换

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