check-load-average.sh

#!/bin/bash
#
# Script to send email notification if a server exceeds a specified load average.
#
# Selected load average limit.  If above this number a notification message will be emailed.
NOTIFY="1"
EMAIL="admin@example.com"

TRUE="1"

# Create a temp file
TEMPFILE="$(mktemp)"

FTEXT='load average:'

LOAD1MIN="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f1 | sed 's/ //g')"
LOAD5MIN="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f2 | sed 's/ //g')"
LOAD15MIN="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f3 | sed 's/ //g')"

MEMU="$(free -tom | awk '/Total:/ {print "Total memory: "$2" MB\nUsed memory: "$3" MB\nFree memory: "$4" MB"}')"
SUBJECT="Alert $(hostname) high load average: $LOAD1MIN"

echo "Server 5 min load average $LOAD5MIN is above notification threshold $NOTIFY" >> $TEMPFILE
echo " " >> $TEMPFILE
echo "Hostname: $(hostname)" >> $TEMPFILE
echo "Local Date & Time : $(date)" >> $TEMPFILE
echo " " >> $TEMPFILE
echo "Server load for now: $LOAD1MIN" >> $TEMPFILE
echo "Server load for the last five minutes: $LOAD5MIN" >> $TEMPFILE
echo "Server load for the last fifteen minutes: $LOAD15MIN" >> $TEMPFILE
echo " " >> $TEMPFILE
echo "------------------------" >> $TEMPFILE
echo "Memory stats:" >> $TEMPFILE
echo "------------------------" >> $TEMPFILE
echo "$MEMU" >> $TEMPFILE
echo " " >> $TEMPFILE


RESULT=$(echo "$LOAD1MIN > $NOTIFY" | bc)

if [ "$RESULT" == "$TRUE" ]; then
    /usr/sbin/sendmail "$EMAIL" -s "$SUBJECT" < $TEMPFILE
fi