Shell脚本Ping监控主机是否存活并发邮件报警(三种方法)
#前提已经可以通过mail或mutt客户端发邮件
1.先安装sendmail来发邮件
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# yum -y install sendmail
# /etc/init.d/sendmail start
# chkconfig sendmail on
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2.再安装邮件客户端
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# yum -y install mutt
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2.1 为了更好在邮件中显示，设置mutt客户端发送信息
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# vim /etc/Muttrc
set charset="utf-8" #设置发邮件编码
set envelope_from=yes
set rfc2047_parameters=yes #解决附件乱码问题
set realname="报警" #发件人别名
set use_from=yes #指定是否显示别名
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方法1、通过加失败计数器来判断（误报率低）
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#!/bin/bashDATE=`date +%F" "%H:%M`
IP=/root/monitor/ip.txt #ip地址表
for ip in $(cat $IP | sed '/^#/d')
do for ((i=1;i<=3;i++))
do
ping -c 1 $ip &>/dev/null
[ $? -ne 0 ] && let FailCount+=1;
done
done[ -z $FailCount ] && FailCount=0 #当ping都正常时，FailCount值为空，就设置FailCount值为0，用整数比较
if [ $FailCount -eq 2 ];then
#echo "$IP ping is failed."
echo -e "Date : $DATE\nHost : $ip\nProblem : Ping is failed, Please check ! ! !" | mutt -s "Ping Monitor" $MAIL
fi |
#添加任务计划
# crontab -e
*/1 * * * * /root/monitor/ping.sh
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done |
方法二、通过ping一个包的状态判断（误报率低，建议此方法）
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#!/bin/bashfor ip in $(cat ip_list|sed "/^#/d") #ip_list是当前目录下IP表
do
ping -c 1 $ip &>/dev/null #三个ping有一个能通，说明服务器正常
a=$?
sleep 2
ping -c 1 $ip &>/dev/null
b=$?
sleep 2
ping -c 1 $ip &>/dev/null
c=$?
sleep 2
DATE=$(date +%F" "%H:%M)
if [ $a -ne 0 -a $b -ne 0 -a $c -ne 0 ];then
echo -e "Date : $DATE\nHost : $ip\nProblem : Ping is failed." | mail -s "Ping $ip failed From 255.252" $MAIL
#else
# echo "$ip ping is successful."
fi
done |
方法三、通过丢包率来判断是否正常（误报率高）
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#!/bin/bashwhile true
do DATE=`date +%F" "%H:%M`
for ip in $(cat ip_list|sed "/^#/d") #ip_list是当前目录下IP表
do
num=$(ping -c 2 $ip |grep "100% packet loss" |wc -l)
if [ $num == 1 ];then
echo -e "Date : $DATE\nHost : $i\nProblem : Ping is failed." | mail -s "Ping $i failed From 255.252" $MAIL
fi
done
sleep 30
done |