bash - Ping Tool to check if server is online -


is tool created various sof threads valid? work? want have ping test done server every minute. if fails 5 times in row sends email out. flushes , resets script pretty check again.

#!/bin/bash # ping checker tool  numoffails=0 incrememnt=1 emailmessage="/tmp/emailmessage.txt"  while true;     if ! ping -c 1 google.com ; #if ping exits nonzero...         numoffails=$(($num + $increment))     else         numoffails=0     fi     if ((numoffails > 4));         numoffails=0         echo "san offline!" > $emailmessage         mail -s "san offline" "test@test.com" < $emailmessage     fi     sleep 60 #check again in 1 minute done

your code won't work @ all, revised version:

#!/bin/bash # ping checker tool  fails=0 email_address="example@example.com" server="192.168.1.1" sleep=60  while true;     ping -c 1 $server >/dev/null 2>&1     if [ $? -ne 0 ] ; #if ping exits nonzero...         fails=$[fails + 1]     else         fails=0     fi     if [ $fails -gt 4 ];         fails=0         echo "server $server offline!" \             | mail -s "server offline" "$email_address"     fi     sleep $sleep #check again in sleep seconds done

change example@example.com , 192.168.1.1 email address , ip address of server testing. recommend using , ip address instead of hostname prevent mixing name resolution errors connection errors.

please advised although work recommend running different script cron instead of having running continuously seem want, when running cron not need monitor script running since if stops reason monitoring of server stops well.

something run crontab every minute.

#!/bin/bash # ping checker tool  tmp_file="/tmp/ping_checker_tool.tmp" if [ -r $tmp_file ];     fails=`cat $tmp_file` else     fails=0 fi email_address="example@example.com" server="192.168.1.1"  ping -c 1 $server >/dev/null 2>&1 if [ $? -ne 0 ] ; #if ping exits nonzero...     fails=$[fails + 1] else     fails=0 fi if [ $fails -gt 4 ];     fails=0     echo "server $server offline!" \         | mail -s "server offline" "$email_address" fi echo $fails > $tmp_file

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