lvs 简单配置

ikjhgf

环境描述：本文在配置LVS时使用三台linux，虚拟VIP:192.168.0.254
一台做Directorserver(192.168.0.1)
两台做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
  
  
软件
ipvsadm-1.24.tar.gz:
  
tar zxvf ipvsadm-1.24.tar.gz
cd ipvsadm-1.24
make && make install
注意在make时可能会出现很多错误的信息，请按照如下操作就可以心编译正常
ln -s /usr/src/kernels/2.6.11-1.1369_FC4-i686/ /usr/src/linux
在进行编译就不会出错了
或者yum安装
yum -y install ipvsadm*
======================================
配置基于DR模式Lvs集群
192.168.0.1
[iyunv@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
[iyunv@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
[iyunv@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
==================================
[iyunv@localhost lvs]# cat /usr/local/apache/htdocs/index.html
This is realserver1
[iyunv@localhost lvs]#  cat /usr/local/apache/htdocs/index.html
This is realserver2
分别启动服务
./LvsDR start
./realserver
./realserver
启动apache
访问:
http://192.168.0.254
验证的时候可以人为造成负载过高，这样就从一台跳转到另一台
find / -name aaaaaaaaa
不断刷新会出现This is realserver1 This is realserver2


xf后记  ：               
如果启动后未产生/etc/sysconfig/ipvsadm文件
可执行
ipvsadm --save > /etc/sysconfig/ipvsadm 保存配置，这样每次重启lvs服务就不需要执行/usr/local/lvs/LvsDR 脚本了。（因为/etc/init.d/ipvsadm脚本中默认读取/etc/sysconfig/ipvsadm 配置）



查看负载状态
ipvsadm -L -n



重启
service ipvsadm restart