LVS下的RealServer脚本

实验环境：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，调度算法为wlc

       需求实现：模型正常工作，及Director实现自动检测，当任意RS故障时，自动将其移除，当检测到其状态正常时，再将其添加进来，并保证其原有属性不变。

       Director的脚本放置为：/etc/init.d/director和/etc/init.d/lvs，其中director脚本可使用chkconfig -add director进行管理。  lvs仅作函数放置即可，其功能笔者已将其整合进director脚本，负责进行检测RS的状态并做操作的，也只有这个是笔者自己写的，并为其提供了简单的配置文件(/etc/sysconfig/lvs.conf) ，默认为两秒检测一次，如需修改，直接修改lvs.conf里面的sec=n秒 即可。废话不多，上代码：

       对了，为了方便各位看官，相关文件可以直接附件下载。

Director第一个脚本:

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 &

完成后，记得执行 chkconfig -add director 表急着启动哈；下面上lvs脚本代码：

#!/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

记得完成后给执行权限，其配置文件如下：

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