本文介绍使用LVS实现负载均衡的DR模式实验。
1，实验环境：
负载均衡器: eth0:192.168.1.16 vip: 192.168.1.17
后端WEB1：192.168.1.19
后端WEB2：192.168.1.20
2，创建LVS DR模式启动脚本
复制代码 代码如下:
[root@localhost ~]# vi /etc/init.d/lvsdsdr
#!/bin/bash
VIP=192.168.1.17
RIP1=192.168.1.19
RIP2=192.168.1.20
/etc/rc.d/init.d/functions
case "$1" in
start)
echo "start LVS of DirectorServer DR"
###广播地址为VIP本身，掩码为255.255.255.255
/sbin/ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.255 up
/sbin/route add -host $VIP dev eth0:0
echo "1" >/proc/sys/net/ipv4/ip_forward
/sbin/ipvsadm -C
/sbin/ipvsadm -A -t $VIP:80 -s rr ###rr是调度算法
/sbin/ipvsadm -a -t $VIP:80 -r $RIP1:80 -g###-g指定工作模式为DR
/sbin/ipvsadm -a -t $VIP:80 -r $RIP2:80 -g
/sbin/ipvsadm
;;
stop)
echo "stop LVS of DirectorServer DR"
echo "0" >/proc/sys/net/ipv4/ip_forward
/sbin/ipvsadm -C
/sbin/ifconfig eth0:0 down
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
[root@localhost ~]# chmod +x /etc/rc.d/init.d/lvsdsdr
[root@localhost ~]# /etc/rc.d/init.d/lvsdsdr start
3, web1,web2分别创建启动脚本
复制代码 代码如下:
[root@localhost ~]# vi /etc/init.d/lvsrsdr
#!/bin/bash
VIP=192.168.1.17
/etc/rc.d/init.d/functions
case "$1" in
start)
echo "start LVS of RealServer DR"
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up ###注意掩码
/sbin/route add -host $VIP dev lo:0 ###VIP绑定至回环接口上
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore ###抑制arp广播
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce ###抑制arp广播
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
stop)
/sbin/ifconfig lo:0 down
echo "close LVS of RealServer DR"
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
[root@localhost ~]# chmod +x /etc/rc.d/init.d/lvsrsdr
[root@localhost ~]# /etc/rc.d/init.d/lvsrsdr start
[root@localhost ~]# ifconfig lo:0
lo:0 Link encap:Local Loopback
inet addr:192.168.1.17 Mask:255.255.255.255
UP LOOPBACK RUNNING MTU:16436 Metric:1
4，web1,web2分别修改首页，启动http服务
复制代码 代码如下:
[root@localhost ~]# vi /var/www/html/index.html
web1 192.168.1.19 ###web1
web2 192.168.1.20 ###web2
[root@localhost ~]# /etc/init.d/httpd start
5，终端及WEB测试
复制代码 代码如下:
[root@localhost ~]# for i in $(seq 1 10);do curl http://192.168.1.17;done
web2 192.168.1.20
web1 192.168.1.19
web2 192.168.1.20
web1 192.168.1.19
web2 192.168.1.20
web1 192.168.1.19
web2 192.168.1.20
web1 192.168.1.19
web2 192.168.1.20
web1 192.168.1.19
LVS-DR模式实验
6，lvs查看访问连接
复制代码 代码如下:
[root@localhost ~]# ipvsadm -lnc
IPVS connection entries
pro expire state source virtual destination
TCP 00:23 FIN_WAIT 192.168.1.10:53198 192.168.1.17:80 192.168.1.19:80
TCP 00:23 FIN_WAIT 192.168.1.10:53192 192.168.1.17:80 192.168.1.19:80
TCP 00:23 FIN_WAIT 192.168.1.10:53191 192.168.1.17:80 192.168.1.20:80
TCP 00:23 FIN_WAIT 192.168.1.10:53199 192.168.1.17:80 192.168.1.20:80
TCP 00:23 FIN_WAIT 192.168.1.10:53195 192.168.1.17:80 192.168.1.20:80
TCP 00:23 FIN_WAIT 192.168.1.10:53197 192.168.1.17:80 192.168.1.20:80
TCP 00:23 FIN_WAIT 192.168.1.10:53193 192.168.1.17:80 192.168.1.20:80
TCP 00:23 FIN_WAIT 192.168.1.10:53194 192.168.1.17:80 192.168.1.19:80
TCP 00:23 FIN_WAIT 192.168.1.10:53196 192.168.1.17:80 192.168.1.19:80
TCP 00:23 FIN_WAIT 192.168.1.10:53200 192.168.1.17:80 192.168.1.19:80
