項目背景

利用lvs的vs/NAT技術實現一個由負載調度器和兩個web服務器組成的架構！

試驗環境

vmware workstation 11

centos6.5的系統下

load balance：ip：192.168.0.32 ? vip：192.168.1.32 ? 關閉iptables ?setenforce0 ? ? ?

user：ip：192.168.1.39 ??關閉iptables ?setenforce0 ? ? ?

real_server01:192.168.0.10 ?gw:192.168.0.32?關閉iptables ?setenforce0 ?

real_server02:192.168.0.36 ?gw:192.168.0.36?關閉iptables ?setenforce0 ?

SecureCRT （ssh遠程連接軟件）

架構圖：

實驗過程：

一、在load balance上面安裝ipvsadm ??

直接用yum安裝

因為我已經安裝成功了，所以顯示已安裝！

二、在load balance上面執行腳本

[root@Load_Balancer ~]# cat lvs.sh?

#!/bin/sh?

#set ip_forward ON for vs-nat director (1 on, 0 off).?

cat /proc/sys/net/ipv4/ip_forward?

echo "1" >/proc/sys/net/ipv4/ip_forward?

#director is gw for realservers?

#turn OFF icmp redirects (1 on, 0 off)?

echo "0" >/proc/sys/net/ipv4/conf/all/send_redirects?

cat /proc/sys/net/ipv4/conf/all/send_redirects?

echo "0" >/proc/sys/net/ipv4/conf/default/send_redirects?

cat /proc/sys/net/ipv4/conf/default/send_redirects?

echo "0" >/proc/sys/net/ipv4/conf/eth0/send_redirects?

cat /proc/sys/net/ipv4/conf/eth0/send_redirects?

#clear ipvsadm tables?

/sbin/ipvsadm -C?

#install LVS services with ipvsadm?

#add telnet to VIP with rr sheduling?

/sbin/ipvsadm -A -t 192.168.1.32:80 -s rr?

#first realserver?

/sbin/ipvsadm -a -t 192.168.1.32:80 -r 192.168.0.10:80 -m -w 1?

#second realserver?

#forward telnet to realserver 192.168.0.36 using LVS-NAT (-m), with weight=1?

/sbin/ipvsadm -a -t 192.168.1.32:80 -r 192.168.0.36:80 -m -w 1?

#list ipvsadm table?

/sbin/ipvsadm?

三、在real server01上面執行腳本

[root@real_server01 ~]# cat real_server01.sh?

#!/bin/sh?

#show routing table?

/bin/netstat -rn?

#set_realserver_ip_forwarding to OFF (1 on, 0 off).?

echo "0" >/proc/sys/net/ipv4/ip_forward?

cat /proc/sys/net/ipv4/ip_forward?

四、在real server02上執行腳本

[root@real_server02 ~]# cat real_server02.sh?

#!/bin/sh?

#show routing table?

/bin/netstat -rn?

#set_realserver_ip_forwarding to OFF (1 on, 0 off).?

echo "0" >/proc/sys/net/ipv4/ip_forward?

cat /proc/sys/net/ipv4/ip_forward?

五、測試，在user上打開瀏覽器輸入vip 192.168.1.32

可以看到，我在user服務器上訪問load balance上面的vip，可以訪問到后端的web集群。

總結：VS/NAT技術是我們呢常用的構建lvs集群的技術，當然你可以在后端部署十幾臺或者幾十臺服務器。希望大家都有所得

總結

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