Send email alert using SNMP and bash scripting: SNMP, BASH

Send email alert using SNMP and bash scripting

Hi,

I have wrote a script in bash which shows the status of the unix services as up or down depending on output of snmpwalk command. Basically when the output of snmp command is 0 the service is displayed as UP and when the output is 1 the service is displayed as down on the webpage. Also when the service is down then the script also send a email using sendmail command. The script runs every minute as a cron job. The major flaw of this scripts is till the time the service is down the script keeps sending email every minute.

Now i want that script should send email only once when it find outs that service is down. There should not be any emails till the service comes up again. Once the service is up the count should reset to 0 and when next time the service goes down again the script should send the email again. How can i achieve this ???

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Hi,

please try the attached script. It will get the service names by snmp, too, but I couldn't test, obviously.

Have fun!

wmp

#!/bin/bash
 
# --- Prolog --- #
MAILTO=USER@company.com
 
# --- Check --- #
names_array=( $(snmpwalk -v 1 -c public -m all xxx.xxx.xxx.xxx ucdavis.prTable.prEntry.prNames | awk 'BEGIN { FS=":" } { print $4 }' | tr -d " ") )
serv_array=( $(snmpwalk -v 1 -c public -m all xxx.xxx.xxx.xxx ucdavis.prTable.prEntry.prErrorFlag | awk 'BEGIN { FS=":" } { print $4 }' | tr -d " ") )
 
# --- DOIT --- #
i=0
while [ $i -lt ${#serv_array[@]} ]
 
 do
 
  LOCK=/tmp/${names_array[i]}.down
 
   if [ ${serv_array[i]} -eq 1 ] ; then
 
        color_array[i]="bgcolor=red"
        status_array[i]="DOWN"
        [ -e $LOCK ] || mailx -s "${names_array[i]} ${status_array[i]}" $MAILTO
        touch $LOCK
 
   elif [ ${serv_array[i]} -eq 0 ] ; then
 
        color_array[i]="bgcolor=green"
        status_array[i]="UP"
        [ -e $LOCK ] && mailx -s "${names_array[i]} ${status_array[i]}" $MAILTO
        rm $LOCK >/dev/null 2>&1
 
   else
        color_array[i]="bgcolor=yellow"
        status_array[i]="NO DATA"
 
   fi
 
 
  echo "<tr><td align=center "${color_array[i]}">"${status_array[i]}"</td></tr>"
 
 
  ((i++))
 done
 
# --- EXIT --- #
exit

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Send email alert using SNMP and bash scripting

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SNMP

BASH

Bourne-Again Shell (bash)

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