lvs实验

实验环境

DR Server
Hostname: vos1.alv.pub
Et0-IP: 192.168.105.201
Eth0:1-VIP: 192.168.105.222 Netmask 255.255.255.255

Real Server 1
Hostname: vos2.alv.pub
Eth0-IP: 192.168.105.202
lo:0-VIP:192.168.105.222 Netmask 255.255.255.255

Real Server 2
Hostname vos3.alv.pub
Eth0-IP: 192.168.105.203
Lo:0-IP:192.168.105.222 Netmask 255.255.255.255

DR端的安装配置

yum install ipvsadm -y
echo 1 > /proc/sys/net/ipv4/ip_forward
ifconfig eth0:1 192.168.105.222 netmask 255.255.255.255 up
route add -host 192.168.105.222 dev eth0:1
[root@vos1 ~]# ipvsadm -A -t 192.168.105.222:80 -s rr
[root@vos1 ~]# ipvsadm -a -t 192.168.105.222:80 -r 192.168.105.202:80 -g
[root@vos1 ~]# ipvsadm -a -t 192.168.105.222:80 -r 192.168.105.203:80 -g

执行watch “ipvsadm -Lnc”可以监控连接状态

Real Server 1的安装配置

yum install httpd -y
echo web1 > /var/www/html/index.htm
/etc/init.d/httpd start
ifconfig lo:0 192.168.105.222 netmask 255.255.255.255 up
route add -host 192.168.105.222 dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce

Real Server 2 的安装配置

yum install httpd -y
echo web2 > /var/www/html/index.htm
/etc/init.d/httpd start
ifconfig lo:0 192.168.105.222 netmask 255.255.255.255 up
route add -host 192.168.105.222 dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce

客户端测试

可以看到，第一次访问时web2，再访问一次，就变成web1了，再访问，又成了web2,，也就是说，我们访问vos1上的VIP那个IP 192.168.105.222的时候，被转到vos2和vos3上去了，成功实现了轮询。

[root@vos4 ~]# curl 192.168.105.222
web2
[root@vos4 ~]# curl 192.168.105.222
web1
[root@vos4 ~]# curl 192.168.105.222
web2
[root@vos4 ~]# curl 192.168.105.222
web1

lvs默认没有健康检测，不能自动将故障节点删除，所以即使有一个后端节点无法提供服务了，lvs这边也会将请求调度到那个故障节点。