實驗環境：rhel5.8
Director
DIP：192.168.88.132 VIP：192.168.88.120
RealServer
RIP1：192.168.88.129 VIP：192.168.88.120
RIP1：192.168.88.134 VIP：192.168.88.120
DR模型，調度算法為wlc
需求實現：模型正常工作，及Director實現自動檢測，當任意RS故障時，自動將其移除，當檢測到其狀態正常時，再將其添加進來，並保證其原有屬性不變。
Director的腳本放置為：/etc/init.d/director和/etc/init.d/lvs，其中director腳本可使用chkconfig -add director進行管理。 lvs僅作函數放置即可，其功能筆者已將其整合進director腳本，負責進行檢測RS的狀態並做操作的，也只有這個是筆者自己寫的，並為其提供了簡單的配置文件(/etc/sysconfig/lvs.conf) ，默認為兩秒檢測一次，如需修改，直接修改lvs.conf裡面的sec=n秒 即可。廢話不多，上代碼：
對了，為了方便各位看官，相關文件可以直接附件下載。
Director第一個腳本:
cat /etc/init.d/director
#!/bin/sh
#
# LVS script for VS/DR
#
# chkconfig: 345 99 99
# description: LVS DR
#
# processname: director
#
. /etc/rc.d/init.d/functions
VIP=192.168.88.120
RIP1=192.168.88.129
RIP2=192.168.88.134
PORT=80
#
case "$1" in
start)
/sbin/ifconfig eth1:1 $VIP broadcast $VIP netmask 255.255.255.255 up
/sbin/route add -host $VIP dev eth1:1
# Since this is the Director we must be able to forward packets
echo 1 > /proc/sys/net/ipv4/ip_forward
# Clear all iptables rules.
/sbin/iptables -F
# Reset iptables counters.
/sbin/iptables -Z
# Clear all ipvsadm rules/services.
/sbin/ipvsadm -C
# Add an IP virtual service for VIP 192.168.0.219 port 80
# In this recipe, we will use the round-robin scheduling method.
# In production, however, you should use a weighted, dynamic scheduling method.
/sbin/ipvsadm -A -t $VIP:80 -s wlc
# Now direct packets for this VIP to
# the real server IP (RIP) inside the cluster
/sbin/ipvsadm -a -t $VIP:80 -r $RIP1 -g -w 9
/sbin/ipvsadm -a -t $VIP:80 -r $RIP2 -g -w 8
/bin/touch /var/lock/subsys/ipvsadm &> /dev/null
;;
stop)
# NUM1=`ps aux|grep lvs|grep -v grep|awk '{print $2}'`
# `kill $NUM1`
# Stop forwarding packets
echo 0 > /proc/sys/net/ipv4/ip_forward
# Reset ipvsadm
/sbin/ipvsadm -C &>/dev/null
# Bring down the VIP interface
/sbin/ifconfig eth1:1 down &>/dev/null
/sbin/route del $VIP &>/dev/null
/bin/rm -f /var/lock/subsys/ipvsadm &>/dev/null
echo "ipvs is stopped..."
;;
status)
if [ ! -e /var/lock/subsys/ipvsadm ]; then
echo "ipvsadm is stopped ..."
else
echo "ipvs is running ..."
ipvsadm -L -n
fi
;;
*)
echo "Usage: $0 {start|stop|status}"
;;
esac
[ -x /etc/rc.d/init.d/lvs ] && . /etc/rc.d/init.d/lvs
LVS_DIRECTOR &
完成後，記得執行 chkconfig -add director 表急著啟動哈；下面上lvs腳本代碼：
#!/bin/sh
#
# LVS script for VS/DR
#
# chkconfig: 345 95 93
# description: LVS DR Check
#
# processname: lvs.sh
#
# Author: MOS
# Script name: lvs.sh
# Date & Time: 2012-11-25/00:41:17
# Version: 1.0.1
# Description:
#
LVS_DIRECTOR(){
[ ! -x /sbin/ipvsadm ] && exit 1
[ ! -x /sbin/ipvsadm-save ] && exit 1
#[ ! -x /sbin/ipvsadm ] && echo "no such command: ipvsadm"
#[ ! -x /sbin/ipvsadm-save ] && echo "no such command: ipvsadm"
[ -f /etc/sysconfig/lvs.conf ] && . /etc/sysconfig/lvs.conf
Test=${Test:-.mos.html}
TestStr=${TestStr:-MOS}
Sec=${Sec:-10}
Log=${Log:-Off}
[ $Log = "On" ] && Logfile=${Logfile:-/var/log/ipvs.log}
VIP=`ipvsadm-save -n 2>/dev/null|awk '{print $3}'|uniq`
#[ -z $VIP ] && echo "Not such VIP" && exit 1
[ -z $VIP ] && exit 1
RIP=(`ipvsadm-save -n 2>/dev/null|awk '{print $5}'|grep "^[0-9].*[0-9]$"`)
#[ -z "${RIP[0]}" ] && echo "Not such RIP" && exit 2
[ -z "${RIP[0]}" ] && exit 2
Tmpfile=`mktemp /tmp/lvs.XXXXXX 2> /dev/null`
`ipvsadm-save -n > $Tmpfile`
Rtmp=${Rtmp:-On}
[ $Rtmp = "On" ] && `find /tmp -type f -mtime +2 -name "lvs.*" -exec rm -rf {} \;`
while :;do
for i in ${RIP[*]};do
Str=`elinks -dump "$i"/"$Test" 2>/dev/null|awk '{print $1}'`
[[ "$Str" != "$TestStr" ]] && `ipvsadm -d -t $VIP -r $i 2>/dev/null` && continue
# [[ "$Str" != "$TestStr" ]] && Restore=`ipvsadm-save -n|grep $i` && `ipvsadm -d -t $VIP -r $i 2>/dev/null` && continue
RIP_1=`ipvsadm -Ln 2>/dev/null|grep $i`
[[ -n "$RIP_1" ]] && continue
if [[ "$Str" == "$TestStr" ]] ;then
Restore=`grep $i $Tmpfile 2>/dev/null|uniq`
ResN=`grep $i $Tmpfile 2>/dev/null|uniq|wc -l`
[ $ResN -ne 1 ] && [[ "$Log" == "On" ]] && echo "Warn: Please RIP quantity." >> $Logfile
`ipvsadm $Restore &>/dev/null`
fi
done
Quit=`ipvsadm-save -n 2>/dev/null`
[[ -z "$Quit" ]] && exit 0
sleep $Sec
done
}
#LVS_DIRECTOR
記得完成後給執行權限，其配置文件如下：
Test=.mos.html TestStr=MOS Log=Off Logfile=/var/log/ipvs.log Sec=2 Rtmp=On
簡單說一下：
Test是檢查RS的網頁根目錄必須要有個您自己的html文件，您寫上你自己的，並保證其能被正常訪問例如您的是 test.html那麼 http://192.168.88.129/test.html必須可以訪問才行。
TestStr第二個是這個網頁的內容，腳本就是通過判斷這個測試頁內的內容，如果您的test.html裡面是test,那麼此處記得把MOS換成test即可
Log相關的只是個設想，筆者做的時候，有個測試，筆者試著寫入自定義日志記錄，後來一直沒用，不管即可
Sec是每個幾秒會重新檢測一下RS有沒有故障的，這個默認2秒，看您需求
Rtmp筆者的lvs腳本每次啟動會自動生成一個臨時文件，用以記錄當前的vip和rip，一直開著腳本還好說，測試的話，每次都會生成不同的...你懂的，這個的意思就是會自動刪除之前的，貌似筆者設置的是自動刪除兩天前的。
下面提供RealServer腳本，上代碼：
#!/bin/bash
#
# Script to start LVS DR real server.
# chkconfig: - 95 15
# description: LVS DR real server
#
. /etc/rc.d/init.d/functions
VIP=192.168.88.120
host=`/bin/hostname`
case "$1" in
start)
# Start LVS-DR real server on this machine.
/sbin/ifconfig lo down
/sbin/ifconfig lo up
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
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
/sbin/route add -host $VIP dev lo:0
;;
stop)
# Stop LVS-DR real server loopback device(s).
/sbin/ifconfig lo:0 down
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
;;
status)
# Status of LVS-DR real server.
islothere=`/sbin/ifconfig lo:0 | grep $VIP`
isrothere=`netstat -rn | grep "lo:0" | grep $VIP`
if [ ! "$islothere" -o ! "isrothere" ];then
# Either the route or the lo:0 device
# not found.
echo "LVS-DR real server Stopped."
else
echo "LVS-DR real server Running."
fi
;;
*)
# Invalid entry.
echo "$0: Usage: $0 {start|status|stop}"
exit 1
;;
esac
記得chkconfig --add 並修改權限..到此完成...
本文出自 “自強不息” 博客，請務必保留此出處http://mos1989.blog.51cto.com/4226977/1071245
