External Scripts

[Silvery]

I've got a problem with my external scripts.
Most of the time they're working very well, but sometimes I find those messages in my zabbix_server.log:

Item [Host:check_fan.sh[]] error: Script /etc/zabbix/externalscripts/check_fan.sh returned nothing.
8711:20100204:083254 Parameter [check_fan.sh[]] is not supported by agent on host [Host] Old status [0]
Parameter [check_fan.sh[]] became supported by agent on host [Host]

Is there something wrong with my script or what's the meaning of this?

check_fan.sh:

#!/bin/bash

HOSTNAME="$1"
COMMUNITY="$2"
OK=1
FAILURE=""

for i in `seq 1 10` ; do
        OUT=`snmpwalk -c $COMMUNITY -v 1 $HOSTNAME .1.3.6.1.4.1.x.x.x.x.x.3.$i | awk '{ print $4 }'`

# Status:
# 1 = Failure
# 2 = OK
# 3 = Unknown

if [ ! -z $OUT ]; then
        if [ $OUT -eq 1 ]; then
                FAILURE=$FAILURE"CRITICAL - Fan $i failed "
                OK=0
        fi
        if [ $OUT -eq 3 ]; then
                FAILURE=$FAILURE"Status of fan $i unknown "
                OK=0
        fi
fi

done

if [ $OK -eq 1 ]; then
        echo "OK"
        exit
fi

echo "$FAILURE"
exit

[alj]

I believe zabbix agent has default timeout 5 sec or so, since your script launches snmpwalk 10 times it probably runs longer than 5 sec in some cases which triggers timeout.

Your solution would be to run script from cron and deliver result to trapper via zabbix_sender.