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Full Discussion: False alerts
Top Forums Shell Programming and Scripting False alerts Post 302992336 by Don Cragun on Thursday 23rd of February 2017 09:36:19 PM
Old 02-23-2017
I don't have sar on the system I use, so it is hard to guess at what might be going on. Furthermore, since you don't preserve the value that is triggering your mail message, we have even less information.

You could reduce the load on your system a little bit, preserve the CPU load value, and get rid of the temp file by changing:
Code:
ALERT="monitoringbox@abc.com"
TEMPFILE=/tmp/temp1
HOSTNAME=`hostname`
rm -f $TEMPFILE
CPU_LOAD=`sar -P ALL 10 1 |grep Average' |awk -F" " '{print 100.0 -$NF}' |cut -d \. -f1`
if [[ $CPU_LOAD -gt $LIMIT ]];
then
echo "CPU is high on $HOSTNAME " >> $TEMPFILE
fi
if [ -e $TEMPFILE ]
then
mail -s " CPU ALERT  " $ALERT < $TEMPFILE
fi
rm -f $TEMPFILE

to:
Code:
ALERT="monitoringbox@abc.com"
HOSTNAME=`hostname`
CPU_LOAD=`sar -P ALL 10 1 | awk -F" " '/Average/{print int(100-$NF)}'`
if [[ $CPU_LOAD -gt $LIMIT ]]
then	echo "CPU is high ($CPU_LOAD) on $HOSTNAME" | mail -s " CPU ALERT" "$ALERT"
fi

Please try this and let us know what mail message you get when the CPU load is not high.
 

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LEARN ABOUT DEBIAN

rt-email-dashboards-4

rt-email-dashboards(8)					     Request Tracker Reference					    rt-email-dashboards(8)

NAME

       rt-email-dashboards - Send email dashboards

SYNOPSIS

	   rt-email-dashboards [options]

DESCRIPTION

       This tool will send users email based on how they have subscribed to dashboards. A dashboard is a set of saved searches, the subscription
       controls how often that dashboard is sent and how it's displayed.

       Each subscription has an hour, and possibly day of week or day of month. These are taken to be in the user's timezone if available, UTC
       otherwise.

SETUP

       You'll need to have cron run this script every hour. Here's an example crontab entry to do this.

	   0 * * * * /usr/bin/perl /opt/rt4/local/sbin/rt-email-dashboards

       This will run the script every hour on the hour. This may need some further tweaking to be run as the correct user.

OPTIONS

       This tool supports a few options. Most are for debugging.

       -h
       --help  Display this documentation

       --dryrun
	       Figure out which dashboards would be sent, but don't actually generate or email any of them

       --time SECONDS
	       Instead of using the current time to figure out which dashboards should be sent, use SECONDS (usually since midnight Jan 1st, 1970,
	       so 1192216018 would be Oct 12 19:06:58 GMT 2007).

       --epoch SECONDS
	       Back-compat for --time SECONDS.

       --all   Ignore subscription frequency when considering each dashboard (should only be used with --dryrun for testing and debugging)

perl v5.14.2							    2013-05-22						    rt-email-dashboards(8)
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