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Using on a script from Alex Zeng as the basis, we’ve created a script to check the status of a Cacti system and send out alerts in case of issues. The original script checked the Cacti log file only, while this enhanced version also checks on the poller runtime and 15min system load data. Feel free to use and enhance it accordingly. Save it as check_cacti.sh within the cli directory of your Cacti installation

#!/bin/bash
#####
# Check Cacti Status and report any Errors/Warning
#
# Version:
# 1.10
#
# Changelog:
# 1.10 - Added System Load and Cacti Runtime
# 1.00 - Initial Release
##### 
 
if [ $# -lt 2 ]; then
cat <<EOF
 Check cacti log
 usage: check_cacti.sh <CACTI_HOME>
 examples: 
 check_cacti.sh /export/home/cacti 30 #check last 30 lines in cacti log
EOF
 exit 1
fi
 
# arguments
CACTI_HOME="$1"
lines_to_check="$2"
MAX_CACTI_RUNTIME=60
MAX_SYSTEM_LOAD=9

# Get Path to script.
SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 # configuration
MAIL_TO="support@example.com"
CACTI_LOG="$CACTI_HOME/log/cacti.log"
CHECK_LOG="$CACTI_HOME/log/check_cacti.log"
 
echo "`date` : Start" > $CHECK_LOG
echo "" >> $CHECK_LOG
echo "" >> $CHECK_LOG

#check if the logfile get updated
current=`date +%s`
last_modified=`stat -c "%Y" $CACTI_LOG`
if [ $(($current-$last_modified)) -gt 3600 ]; then
 title="CACTI log didn't get updated in last hour"; 
 ls -lt $CACTI_LOG >> $CHECK_LOG
fi
 
#check warning or error msg in log, only if cacti log is updated
if [ "ISEMPTY$title" = "ISEMPTY" ] ; then
 warning=`tail -$lines_to_check $CACTI_LOG | grep -i -e warning -e error | grep -v -f $SCRIPTDIR/check_cacti.filter`
 if [ "ISEMPTY$warning" = "ISEMPTY" ] ; then
 echo "No warning or error msg" >> $CHECK_LOG
 else
 echo "" >> $CHECK_LOG
 echo "==================================" >> $CHECK_LOG
 echo " Cacti Log Information" >> $CHECK_LOG
 echo "==================================" >> $CHECK_LOG
 echo " Filters:" >> $CHECK_LOG
 cat $SCRIPTDIR/check_cacti.filter >> $CHECK_LOG
 echo "" >> $CHECK_LOG
 echo "==================================" >> $CHECK_LOG
 title="found warning/error in $CACTI_LOG"
 tail -$lines_to_check $CACTI_LOG | grep -i -e warning -e error | grep -v -f $SCRIPTDIR/check_cacti.filter >> $CHECK_LOG
 fi
fi

### Cacti Runtime Check
lastruntime=`grep "SYSTEM STATS" $CACTI_LOG | tail -f -n 1 | awk '{print $7}' | awk -F: '{print $2}'`
historyruntime=`grep "SYSTEM STATS" $CACTI_LOG | tail -f -n 5`
if [ $((${lastruntime%.*})) -gt $(($MAX_CACTI_RUNTIME-5)) ]; then
 echo "" >> $CHECK_LOG
 echo "==================================" >> $CHECK_LOG
 echo " Cacti RUNTIME Information" >> $CHECK_LOG
 echo "==================================" >> $CHECK_LOG
 title="Cacti runtime is high";
 echo "$historyruntime" >> $CHECK_LOG
fi
 
### System load Check
load=`uptime`
maxload=`uptime | awk -F, '{ print $4 $5 $6 }' | awk '{ print $5 }'`
if [ $((${maxload%.*})) -gt $((MAX_SYSTEM_LOAD)) ]; then
 echo "" >> $CHECK_LOG
 echo "==================================" >> $CHECK_LOG
 echo " System Load Information" >> $CHECK_LOG
 echo "==================================" >> $CHECK_LOG
 title="System load is high";
 echo "$load" >> $CHECK_LOG
fi

echo "" >> $CHECK_LOG
echo "" >> $CHECK_LOG
echo "`date` : End" >> $CHECK_LOG

#send mail
if [ "ISEMPTY$title" != "ISEMPTY" ] ; then
 title="$title at `hostname`"
 mailx -s "$title" $MAIL_TO < $CHECK_LOG
fi

The following file check_cacti.filter  needs to be placed in the same directory as the above script. It enables you to filter the Cacti warning and error messages.

SNMP timeout detected
SNMP Get Timeout
Ping timed out
Empty result

Now you can schedule the script to run on an hourly basis:

0 * * * * cacti /var/www/html/cacti/cli/check_cacti.sh /var/www/html/cacti 30

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