安装LVS

下载源码包，安装时需要根据自己的内核，下载 ipvsadm-1.26.tar.gz的源码包，在进行编译安装以后，我们需要检查必需包是否安装：

1.对内核文件做链接

# uname -r
2.6.32-504.el6.x86_64
# ll /usr/src/linux
lrwxrwxrwx 1 root root 38 9月  18 18:17 /usr/src/linux -> /usr/src/kernels/2.6.32-504.el6.x86_64

2.启动内核支持Lvs

modprobe ip_vs
# lsmod |grep ip_vs
ip_vs_wrr               2179  1
ip_vs                 125694  3 ip_vs_wrr
libcrc32c               1246  1 ip_vs
ipv6                  334932  292 ip_vs,ip6t_REJECT,nf_conntrack_ipv6,nf_defrag_ipv6

3.安装一些必须软件

openssl，openssl-devel，popt，上述软件包都可以使用yum安装。

配置DR，将下列脚本cp到服务器上的一个文件下

DR配置启动脚本

#!/bin/bash
# description: start LVS of DirectorServer
#Written by :NetSeek
GW=192.168.1.1# website director vip.
WEB_VIP=192.168.1.111
WEB_RIP1=192.168.1.201
WEB_RIP2=192.168.1.33
. /etc/rc.d/init.d/functionslogger $0 called with $1case "$1" instart)
        /sbin/ipvsadm --set 30 5 60
        /sbin/ifconfig eth0:0 $WEB_VIP broadcast $WEB_VIP netmask 255.255.255.255 up
        /sbin/route add -host $WEB_VIP dev eth0:0
        /sbin/ipvsadm -A -t $WEB_VIP:80 -s wrr -p 3
        /sbin/ipvsadm -a -t $WEB_VIP:80 -r $WEB_RIP1:80 -g -w 1
        /sbin/ipvsadm -a -t $WEB_VIP:80 -r $WEB_RIP2:80 -g -w 1
        touch /var/lock/subsys/ipvsadm >/dev/null 2>&1        # set Arp
        /sbin/arping -I eth0 -c 5 -s $WEB_VIP $GW >/dev/null 2>&1
       ;;
stop)
        /sbin/ipvsadm -C
        /sbin/ipvsadm -Z
        ifconfig eth0:0 down
        route del $WEB_VIP  >/dev/null 2>&1
        rm -rf /var/lock/subsys/ipvsadm >/dev/null 2>&1
        /sbin/arping -I eth0 -c 5 -s $WEB_VIP $GW
        echo "ipvsadm stoped"
       ;;
status)        if [ ! -e /var/lock/subsys/ipvsadm ];then
                echo "ipvsadm is stoped"
                exit 1
        else
                ipvsadm -ln
                echo "..........ipvsadm is OK."
        fi
      ;;*)
        echo "Usage: $0 {start|stop|status}"
        exit 1
esac
exit 0

配置Realserver脚本：

!/bin/bash
# Written by NetSeek
# description: Config realserver lo and apply noarp
WEB_VIP=192.168.1.111
. /etc/rc.d/init.d/functions
case "$1" in
start)
       ifconfig lo:0 $WEB_VIP netmask 255.255.255.255 broadcast $WEB_VIP
       /sbin/route add -host $WEB_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 >/dev/null 2>&1
       echo "RealServer Start OK"
       ;;
stop)
       ifconfig lo:0 down
       route del $WEB_VIP >/dev/null 2>&1
       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 "RealServer Stoped"
       ;;
status)
        # Status of LVS-DR real server.
        islothere=`/sbin/ifconfig lo:0 | grep $WEB_VIP`
        isrothere=`netstat -rn | grep "lo:0" | grep $web_VIP`
        if [ ! "$islothere" -o ! "isrothere" ];then
            # Either the route or the lo:0 device
            # not found.
            echo "LVS-DR real server Stopped."
        else
            echo "LVS-DR Running."
        fi
;;
*)
        # Invalid entry.
        echo "$0: Usage: $0 {start|status|stop}"
        exit 1
;;
esac
exit 0

在Realserver主机上，记得开启ip转发的功能

net.ipv4.ip_forward = 1

分别启动上面的脚本

# watch ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.1.111:80 wrr persistent 3
  -> 192.168.1.33:80              Route   1      0          0
  -> 192.168.1.201:80            Route   1      0          0

看到路由了，基本上也就成功了！