通过Ping判断监控主机的存活

通过Ping命令监控主机是否存活，只要一次ping通则为正常，如果ping失败则继续ping，三次不通就认为主机宕机或网络有问题，这时就可以发送邮件告警了。

方法一：

说明：如果判断的机器数量不多，可以每台机器Ping三次判断

#! /bin/bash

if [ -e /tmp/c.txt ];then

    rm -rf /tmp/c.txt

    touch /tmp/c.txt

else

    touch /tmp/c.txt

fi

if [ -e /tmp/d.txt ];then

    rm -rf /tmp/d.txt

    touch /tmp/d.txt

else

    touch /tmp/d.txt

fi

for i in `seq 100 105`

do

    ip=192.168.2.$i

    ping -c 3 $ip > /dev/null 2>&1

    if [ $? -eq 0 ];then

          echo $ip "is on line" >> /tmp/c.txt

    else

          echo $ip "is offline" >> /tmp/d.txt

    fi

done

方法二：

说明：将错误次数放到fail_count变量来判断是非Ping失败三次

#! /bin/bash

if [ -e /tmp/c.txt ];then

    rm -rf /tmp/c.txt

    touch /tmp/c.txt

else

    touch /tmp/c.txt

fi

if [ -e /tmp/d.txt ];then

    rm -rf /tmp/d.txt

    touch /tmp/d.txt

else

    touch /tmp/d.txt

fi

for i in `seq 100 105`

do

    ip=192.168.2.$i

    fail_count=0

    for ((i=1;i<=3;i++))

    do

        if ping -c 1 $ip > /dev/null;then

            echo "$ip is online" >> /tmp/c.txt

            break

        else

            #echo "$ip ping is offline $i"

            let fail_count++

        fi

done

        if [ $fail_count -eq 3 ];then

            echo "$ip is offline" >> /tmp/d.txt

        fi

done

方法三：

说明：将错误ip放到数组里面判断是否Ping失败三次

#! /bin/bash

if [ -e /tmp/c.txt ];then

    rm -rf /tmp/c.txt

    touch /tmp/c.txt

else

    touch /tmp/c.txt

fi

if [ -e /tmp/d.txt ];then

    rm -rf /tmp/d.txt

    touch /tmp/d.txt

else

    touch /tmp/d.txt

fi

for i in `seq 100 105`

do

    ip=192.168.2.$i

    num=1

    while [ $num -le 3 ]

    do

        if ping -c 1 $ip > /dev/null;then

            echo "$ip is online" >> /tmp/c.txt

            break

        else

            # echo "$ip ping is offline $num"

            fail_count[$num]=$ip

            let num++

        fi

done

        if [ ${#fail_count[*]} -eq 3 ];then

            echo "${fail_count[1]} is offline" >> /tmp/d.txt

        fi

done

方法四：

说明：利用for循环，因为continue，如果ping通就跳出循环，，如果不跳出就会打印ping失败

#! /bin/bash

if [ -e /tmp/c.txt ];then

    rm -rf /tmp/c.txt

    touch /tmp/c.txt

else

    touch /tmp/c.txt

fi

if [ -e /tmp/d.txt ];then

    rm -rf /tmp/d.txt

    touch /tmp/d.txt

else

    touch /tmp/d.txt

fi

ping_success_status(){

    if ping -c 1 $ip > /dev/null;then

        echo "$ip is online" >> /tmp/c.txt

        continue

    fi

}

for i in `seq 100 105`

do

    ip=192.168.2.$i

    ping_success_status

    ping_success_status

    ping_success_status

    echo "$ip is offline" >> /tmp/d.txt

done

下面这个截图，跟上面的图片有一点区别：

ifconfig |awk -F [:a-Z" "]+ 'NR==2{print $2}'可以获取IP地址

本文参考一下文章：

1. http://lizhenliang.blog.51cto.com/7876557/1736770

2. http://blog.csdn.net/zhuying_linux/article/details/6822987

3. http://12100846.blog.51cto.com/12090846/1863259