1 dr模式介绍
1.1 lvs的安装
安装具体解释：http://blog.csdn.net/CleverCode/article/details/50586957。
1.2 lvs模式
lvs有三种模式dr,nat,tun。这里先介绍dr模式。
1.3 dr特点
1）Load Balancer和全部的Real Server在同一个局域网段上。 2）Real Server将请求处理后。直接返回给用户。不须要在通过调度器返回。1.4 处理过程
请求过程：客户 => vip => RealServer。 响应过程：RealServer =>客户。2 配置环境
2.1 LoadBalancer
DIP:192.168.142.133(eth0)。 VIP:192.168.142.211(eth0:1)。2.2 RealServer1
DIP:192.168.142.130(eth0)。2.3 RealServer2
DIP:192.168.142.131(eth0)。3 配置脚本
3.1 配置LoadBalancer
# mkdir -p /usr/local/lvs # cd /usr/local/lvs # vi lvs-dr.sh#!/bin/sh# lvs-dr.sh## lvs的dr模式LVS server脚本## # vip和rip必须在同一个网段。
VS/DR通过改写请求报文的MAC地址。将请求的包发送到realserver上。 # 不改变包的源和目标的IP地址。然后realserver直接回复client。不再经过LVS调度器，这样大大的减轻了LVS的负担。
# set the vip and port VIP=192.168.142.211 VPORT1=80 # set the rip and port # web RIP1=192.168.142.130 RIP2=192.168.142.131 # port RPORT1=80 Usage (){ echo "Usage:`basename $0` (start|stop|status) " exit 1 } if [ $# -ne 1 ];then Usage fi case $1 in start) echo "start LVS of DirectorServer" echo 1 > /proc/sys/net/ipv4/ip_forward # set the vip /sbin/ifconfig eth0:1 $VIP broadcast $VIP netmask 255.255.255.255 up /sbin/route add -host $VIP dev eth0:1 # clear ipvs table /sbin/ipvsadm -C # add lvs vip and port /sbin/ipvsadm -A -t $VIP:$VPORT1 -s rr # add rip and port /sbin/ipvsadm -a -t $VIP:$VPORT1 -r $RIP1:$RPORT1 -g -w 1 /sbin/ipvsadm -a -t $VIP:$VPORT1 -r $RIP2:$RPORT1 -g -w 1 /sbin/ipvsadm -L -n ;; stop) echo "close LVS DirectorServer" /sbin/ipvsadm -C /sbin/ifconfig eth0:1 down ;; status) /sbin/ipvsadm -L -n ;; *) Usage esac
启动 #sh lvs-dr.sh start3.2 配置RealServer1
# mkdir -p /usr/local/lvs# cd /usr/local/lvs
# vi realServer.sh
#!/bin/sh# realServer.sh## lvs的dr模式RIP server脚本# VIP=192.168.142.211#vip's broadcastBROADCAST=192.168.142.255 Usage (){ echo "Usage:`basename $0` (start|stop)" exit 1}if [ $# -ne 1 ];then Usageficase $1 in start) echo "reparing for Real Server" echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce echo "1" >/proc/sys/net/ipv4/conf/eth0/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/eth0/arp_announce /sbin/ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $BROADCAST up /sbin/route add -host $VIP dev lo:0 ;; stop) /sbin/ifconfig lo:0 down echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce echo "0" >/proc/sys/net/ipv4/conf/eth0/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/eth0/arp_announce echo "stop Real Server" ;; *) Usageesac 启动 #sh realServer.sh start 3.3 配置RealServer2
配置同理RealServer1。4 建立webserver測试
1）RealServer1与RealServer2安装与配置Nginx（具体解释：http://blog.csdn.net/clevercode/article/details/45442155） 2）在RealServer1的webserver根文件夹建立index.html # vi index.html if you see this page,then you know this ip is 192.168.142.130 and this page is from nginx! 3）在RealServer2的webserver根文件夹建立index.html # vi index.html if you see this page,then you know this ip is 192.168.142.131 and this page is from nginx! 4）配置host或者dns。将my.domain.com指向VIP:192.168.142.211。5）刷新页面将会看到不同的内同。
