lvs 簡單配置

環境描述：本文在配置LVS時使用三臺linux，虛擬VIP:192.168.0.254 
一臺作Directorserver(192.168.0.1) 
兩臺作realserver(192.168.0.2,192.168.0.3) 
Load Balancer： 192.168.0.1 
Real Server 1： 192.168.0.2 
Real Server 2： 192.168.0.3 
  
  
軟件 
ipvsadm-1.24.tar.gz: 
  
tar zxvf ipvsadm-1.24.tar.gz 
cd ipvsadm-1.24 
make && make install 
注意在make時可能會出現不少錯誤的信息，請按照以下操做就能夠心編譯正常
ln -s /usr/src/kernels/2.6.11-1.1369_FC4-i686/ /usr/src/linux 
在進行編譯就不會出錯了

或者yum安裝

yum -y install ipvsadm*

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配置基於DR模式Lvs集羣 
192.168.0.1
[root@localhost lvs]# cat /usr/local/lvs/LvsDR 
#!/bin/sh 
VIP=192.168.0.254 
RIP1=192.168.0.2 
RIP2=192.168.0.3
/etc/rc.d/init.d/functions 
case "$1" in 
start) 
echo "start LVS of DirectorServer" 
#Set the Virtual IP Address 
/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 
#Set Lvs 
/sbin/ipvsadm -A -t $VIP:80 -s rr 
/sbin/ipvsadm -a -t $VIP:80 -r $RIP1:80 -g 
/sbin/ipvsadm -a -t $VIP:80 -r $RIP2:80 -g 
#Run Lvs 
/sbin/ipvsadm 
;; 
stop) 
echo "close LVS Directorserver" 
/sbin/ipvsadm -C 
;; 
*) 
echo "Usage: $0 {start|stop}" 
exit 1 
esac
=======================================
192.168.0.2
[root@localhost lvs]# cat /usr/local/lvs/realserver 
#!/bin/sh 
VIP=192.168.0.254
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up 
/sbin/route add -host $VIP 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 
sysctl -p
================================================
192.168.0.3
[root@localhost lvs]# cat /usr/local/lvs/realserver 
#!/bin/sh  
VIP=192.168.0.254
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up 
/sbin/route add -host $VIP 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 
sysctl -p
==================================
[root@localhost lvs]# cat /usr/local/apache/htdocs/index.html
This is realserver1
[root@localhost lvs]#  cat /usr/local/apache/htdocs/index.html
This is realserver2
分別啓動服務
./LvsDR start
./realserver 
./realserver 
啓動apache 
訪問: 
http://192.168.0.254
驗證的時候能夠人爲形成負載太高，這樣就從一臺跳轉到另外一臺
find / -name aaaaaaaaa 
不斷刷新會出現This is realserver1 This is realserver2

xf後記  ：               

若是啓動後未產生/etc/sysconfig/ipvsadm文件

可執行

ipvsadm --save > /etc/sysconfig/ipvsadm 保存配置，這樣每次重啓lvs服務就不須要執行/usr/local/lvs/LvsDR 腳本了。（由於/etc/init.d/ipvsadm腳本中默認讀取/etc/sysconfig/ipvsadm 配置）

查看負載狀態

ipvsadm -L -n

重啓

service ipvsadm restart