lvs脚本实现后端服务健康状态检查-定位原创
环境：centos 6.7 32位
主机1：192.168.3.2 （内网）、192.168.3.3（外网）-调度器
主机2：192.168.3.7（内网）-目标主机1
主机3：192.168.3.8（内网）-目标主机2
工作原理：
1、当目标主机中的任意一台挂掉了，直接剔除掉
2、当挂掉的目标主机恢复之后，添加该主机
3、当两台目标主机都挂掉，全部剔除，添加备用主机，这里的备用主机是调度器自身（也可以是是其它）
4、当目标主机有一台恢复了，添加该目标主机，剔除备用主机
5、检测目标主机是否可以访问，连续检测3次，以防个别情况
6、发生剔除目标主机和备用主机，以及添加目标主机和备用主机，相应的信息输出到本地日志当中
注：
VIP：请求主机地址
CPORT：请求主机地址的端口（服务）
FAIL_BACK：备用主机（这里是调度器自身）
RS：数组，包含两个目标主机
RSTATUS：判断目标主机的状态，0：主机存活，1：主机挂掉
RW：数组，给目标主机赋予的权重
RPORT：请求目标主机的端口（服务）
CHKLOOP：检测目标主机的次数
TYPE：lvs类型
LOG：相关信息保存的日志
脚本如下：
#!/bin/bash
#
VIP=192.168.3.3
CPORT=80
FAIL_BACK=127.0.0.1
RS=("192.168.3.7" "192.168.3.8")
export RSTATUS=("0" "0")
RW=("2" "1")
RPORT=80
CHKLOOP=3
TYPE=g
LOG=/var/log/ipvsmonitor.log
[ ! -f $LOG ] && touch $LOG
addrs() {
ipvsadm -a -t $VIP:$CPORT -r $1:$RPORT -$TYPE -w $2
[ $? -eq 0 ] && printf "\e
echo "$I has been added..."
echo -e "`date +'%F %H:%M:%S'`,$I has been added...\n" >> $LOG
RSTATUS[$COUNT]=0
# echo ${RSTATUS[$COUNT]}
}
addback() {
ipvsadm -a -t $VIP:$CPORT -r $FAIL_BACK:$RPORT
[ $? -eq 0 ] && printf "\e
echo "backup machine has added..."
echo -e "`date +'%F %H:%M:%S'`,$FAIL_BACK has been added...\n" >> $LOG
}
delback() {
ipvsadm -d -t $VIP:$CPORT -r $1:$RPORT
[ $? -eq 0 ] && printf "\e
echo "backup machine has removed..."
echo -e "`date +'%F %H:%M:%S'`,$FAIL_BACK has been removed...\n" >> $LOG
}
delrs() {
ipvsadm -d -t $VIP:$CPORT -r $1:$RPORT
[ $? -eq 0 ] && printf "\e
RSTATUS[$COUNT]=1
echo -e "`date +'%F %H:%M:%S'`,$I has been removed...\n" >> $LOG
# echo ${RSTATUS[$COUNT]}
}
checkbak() {
if [ "${RSTATUS}" != "0" -a "${RSTATUS}" != "0" ] && [ "$LOCAL" == "" ];then
addback
elif [ "$LOCAL" == "127.0.0.1" ] && [ "$REALSERVER1" == "" -a "$REALSERVER2" == "" ];then
echo -e "\nbackup machine has added..."
elif [ "$LOCAL" == "127.0.0.1" ] && [ "$REALSERVER1" != "" -o "$REALSERVER2" != "" ];then
delback $LOCAL
else
return 0
fi
}
checkrs() {
local J=1
while [ $J -le $CHKLOOP ]
do
if /usr/bin/curl --connect-timeout 1 http://$I &> /dev/null;then
return 0
fi
let J++
done
return 1
}
while :; do
let COUNT=0
for I in ${RS}
do
checkrs
# echo $?
STATUS=`echo $?`
REALSERVER=`ipvsadm -L -n | grep $I |awk '{print $2}' | cut -d : -f 1`
REALSERVER1=`ipvsadm -L -n | grep ${RS} |awk '{print $2}' | cut -d : -f 1`
REALSERVER2=`ipvsadm -L -n | grep ${RS} |awk '{print $2}' | cut -d : -f 1`
LOCAL=`ipvsadm -L -n | grep 127.0.0.1 |awk '{print $2}' | cut -d : -f 1`
[ $STATUS -eq 0 -a "$REALSERVER" == "" ] && addrs $I ${RW[$COUNT]}
# echo ${RSTATUS[$COUNT]}
[ $STATUS -eq 0 -a "$REALSERVER" != "" ] && echo "$I running normally..."
[ $STATUS -ne 0 -a "$REALSERVER" != "" ] && delrs $I
[ $STATUS -ne 0 -a "$REALSERVER" == "" ] && echo "$I has been removed..."
let COUNT++
done
checkbak
echo "----------------------------------------------------------------"
# echo ${RSTATUS}
# echo ${RSTATUS}
# echo $REALSERVER1
# echo $REALSERVER2
# echo $LOCAL
sleep 5
done
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