LVS之偷懒脚本

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：

cat /etc/sysconfig/lvs.conf
Test=.mos.html
TestStr=MOS
Log=Off
Logfile=/var/log/ipvs.log
Sec=2
Rtmp=On

简单说一下：

Test是检查RS的网页根目录必须要有个您自己的html文件，您写上你自己的，并保证其能被正常访问例如您的是 test.html那么 http://192.168.88.129/test.html必须可以访问才行。

TestStr第二个是这个网页的内容，脚本就是通过判断这个测试页内的内容，如果您的test.html里面是test,那么此处记得把MOS换成test即可

Log相关的只是个设想，笔者做的时候，有个测试，笔者试着写入自定义日志记录，后来一直没用，不管即可

Sec是每个几秒会重新检测一下RS有没有故障的，这个默认2秒，看您需求

Rtmp笔者的lvs脚本每次启动会自动生成一个临时文件，用以记录当前的vip和rip，一直开着脚本还好说，测试的话，每次都会生成不同的...你懂的，这个的意思就是会自动删除之前的，貌似笔者设置的是自动删除两天前的。

 

下面提供RealServer脚本，上代码：

 

#!/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

记得chkconfig --add 并修改权限..到此完成...