使用shell脚本检测lvs中realserver状态，并实现自动删除已挂机主机

werfdsf

#!/bin/sh
# Describe:check the real server status
# History:2015-08-25 22:21:38
# Author:Tim

PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH

VIP=192.168.1.121
DIP=192.168.1.112
RIP=("192.168.1.122" "192.168.1.123")
VPORT=80
STATUS=(0 0)
TYPE=g
SCHEMA=rr
WEIGHT=(1 3)
let COUNT=0

initstats() {
  local I
  for I in `seq 0 1`;do
    if ipvsadm -L -n |grep ${RIP[$I]} &>/dev/null ;then
      STATUS[$I]=1
    else
      STATUS[$I]=0
    fi
  done
}
#初始化realserver状态
add() {
  ipvsadm -a -t $VIP:$CPORT -r ${RIP[$1]} -$TYPE -w ${WEIGHT[$1]}
  [ $? -eq 0 ] && return 0 || return 1
}
#添加realserver
del() {
  ipvsadm -d -t $VIP:$CPORT -r ${RIP[$1]}
  [ $? -eq 0 ] && return 0 || return 1
}
#删除realserver
check() {
    if curl --connect-timeout 1 http://$1 &>/dev/null;then
      return 0
   else
     return 1
   fi
}
#检测realserver状态
initstats
while :;do
for N in `seq 0 1`;do
  if check ${RIP[$N]} ;then
    if [ ${STATUS[$N]} -eq 0 ] ;then
      add $N &&STATUS[$N]=1 && echo "`date +%F-%T` , ${RIP[$N]} is back">>/var/log/ipvs
    fi
  else
    if [ ${STATUS[$N]} -eq 1 ];then
      del $N &&STATUS[$N]=0 &&echo "`date +%F-%T`, ${RIP[$N]} is gone" >>/var/log/ipvs
    fi
  fi

done

if [ ${STATUS[0]} -eq 0 -a ${STATUS[1]} -eq 0 ] ;then
  ipvsadm -a -t $VIP:$CPORT -r $DIP -$TYPE
else
  ipvsadm -d -t $VIP:$CPORT -r $DIP &>/dev/null
fi
sleep 5
done