在網上針對shell腳本ping監控主機是否存活的文檔很多,但大多都是ping一次就決定了狀態,誤報率會很高,爲了精確判斷,ping三次不通再發告警,只要一次ping通則正常。於是,今天中午抽出點時間總結了下面腳本。
腳本功能:通過Ping命令監控主機是否存活,如果ping失敗則繼續ping,三次不通就認爲主機宕機或網絡有問題,這時就可以發送郵件告警了。
方法1:
#!/bin/bash # blog:http://lizhenliang.blog.51cto.com IP_LIST="192.168.18.1 192.168.1.1 192.168.18.2" for IP in $IP_LIST; do NUM=1 while [ $NUM -le 3 ]; do if ping -c 1 $IP > /dev/null; then echo "$IP Ping is successful." break else # echo "$IP Ping is failure $NUM" FAIL_COUNT[$NUM]=$IP let NUM++ fi done if [ ${#FAIL_COUNT[*]} -eq 3 ];then echo "${FAIL_COUNT[1]} Ping is failure!" unset FAIL_COUNT[*] fi done
說明:將錯誤IP放到數組裏面判斷是否ping失敗三次
方法2:
#!/bin/bash # blog:http://lizhenliang.blog.51cto.com IP_LIST="192.168.18.1 192.168.1.1 192.168.18.2" for IP in $IP_LIST; do FAIL_COUNT=0 for ((i=1;i<=3;i++)); do if ping -c 1 $IP >/dev/null; then echo "$IP Ping is successful." break else # echo "$IP Ping is failure $i" let FAIL_COUNT++ fi done if [ $FAIL_COUNT -eq 3 ]; then echo "$IP Ping is failure!" fi done
說明:將錯誤次數放到FAIL_COUNT變量裏面判斷是否ping失敗三次
方法3:
#!/bin/bash # blog:http://lizhenliang.blog.51cto.com ping_success_status() { if ping -c 1 $IP >/dev/null; then echo "$IP Ping is successful." continue fi } IP_LIST="192.168.18.1 192.168.1.1 192.168.18.2" for IP in $IP_LIST; do ping_success_status ping_success_status ping_success_status echo "$IP Ping is failure!" done
說明:這個個人覺得比較巧妙,利用for循環將ping通就跳出循環繼續,如果不跳出就會走到打印ping失敗