负载均衡之LVS--Shell脚本配置LVS
#!/bin/bash#
#
VIP=192.168.19.211
CPORT=80
FAIL_BACK=127.0.0.1
RS=("192.168.19.245" "192.168.19.219") #定义一个数组并赋值
declare -a RSSTATUS #定义一个空数组
RW=("2" "1")
RPORT=80
TYPE=g #定义为DR模型
CHKLOOP=3
LOG=/var/log/ipvsmonitor.log
#定义一个添加规则的函数
addrs() {
if ipvsadm -L -n | grep "$1:$RPORT" &> /dev/null;then
return 0
else
ipvsadm -a -t $VIP:$CPORT -r $1:$RPORT -$TYPE -w $2
[ $? -eq 0 ] && return 0 || return 1
fi
}
#定义删除规则的函数
delrs() {
if ipvsadm -L -n | grep "$1:$RPORT" &> /dev/null;then
ipvsadm -d -t $VIP:$CPORT -r $1:$RPORT
[ $? -eq 0 ] && return 0 || return 1
else
return 0
fi
}
#定义是否要添加错误页面的规则的函数
ifaddls() {
if [ ${RSSTATUS} -eq 0 ];then
if [ ${RSSTATUS} -eq 0 ];then
if ipvsadm -L -n | grep "127.0.0.1:80" &> /dev/null;then
echo "`date '+%F %T'` All RS is Down and Local web is up" >> $LOG
else
ipvsadm -a -t $VIP:$CPORT -r 127.0.0.1:80 -$TYPE
[ $? -eq 0 ]; echo "`date '+%F %T'` All RS is Down! Local 127.0.0.1:80 is up!!!" >> $LOG
fi
else
if ipvsadm -L -n | grep "127.0.0.1:80" &> /dev/null;then
ipvsadm -d -t $VIP:$CPORT -r 127.0.0.1:80
fi
fi
else
if ipvsadm -L -n | grep "127.0.0.1:80" &> /dev/null;then
ipvsadm -d -t $VIP:$CPORT -r 127.0.0.1:80
fi
fi
}
#定义检测后端服务器服务健康状态的函数
checkrs() {
local I=1
while [ $I -le $CHKLOOP ];do
if curl --connect-timeout 1 http://$1 &> /dev/null; then
return 0
fi
let I++
done
return 1
}
#检测脚本初始化函数
initstatus() {
local I
local COUNT=0
for I in ${RS
[*]};do
if ipvsadm -L -n | grep "$I:$RPORT" && > /dev/null; then
RSSTATUS[$COUNT]=1
else
RSSTATUS[$COUNT]=0
fi
let COUNT++
done
}
#脚本开始执行：
initstatus
ifaddls
while :; do #无限循环
let COUNT=0
for I in ${RS
[*]};do
if checkrs $I; then
if [ ${RSSTATUS[$COUNT]} -eq 0 ];then
addrs $I ${RW[$COUNT]}
[ $? -eq 0 ] && RSSTATUS[$COUNT]=1 && echo "`date '+%F %T'`, $I is back." >> $LOG
fi
else
if [ ${RSSTATUS[$COUNT]} -eq 1 ]; then
delrs $I
[ $? -eq 0 ] && RSSTATUS[$COUNT]=0 && echo "`date '+%F %T'`, $I is gone." >> $LOG
fi
fi
let COUNT++
done
ifaddls
sleep 5 #睡眠5s再循环
done
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