Script to Monitor CPU usage on Linux Server

CPU monitoring is important when you are working on the server to know the load and the culprits. It also helps to find tune the databases, applications, servers

. There are many Web-based tools that is available to monitor the CPU. But in this post, I am sharing the shell script to monitor the CPU utilization and it will send a mail-in case the CPU crosses the defined threshold.

Shell script:

The script to alert when the CPU threshold crosses 90%. It will also send information about top consumers.

#!/bin/bash

cpuuse=$(cat /proc/loadavg | awk '{print $3}'|cut -f 1 -d ".")

if [ "$cpuuse" -ge 90 ]; then

SUBJECT="ATTENTION: CPU load is high on $(hostname) at $(date)"

MESSAGE="/tmp/CPU_Mail.out"

TO="himanshu@funoracleapps.com"

echo "CPU current usage is: $cpuuse%" >> $MESSAGE

echo "" >> $MESSAGE

echo "+------------------------------------------------------------------+" >> $MESSAGE

echo "Top 20 processes which consuming high CPU" >> $MESSAGE

echo "+------------------------------------------------------------------+" >> $MESSAGE

echo "$(top -bn1 | head -20)" >> $MESSAGE

echo "" >> $MESSAGE

echo "+------------------------------------------------------------------+" >> $MESSAGE

echo "Top 10 Processes which consuming high CPU using the ps command" >> $MESSAGE

echo "+------------------------------------------------------------------+" >> $MESSAGE

echo "$(ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10)" >> $MESSAGE

mail -s "$SUBJECT" "$TO" < $MESSAGE

rm /tmp/Mail.out

else

echo "Server CPU usage is in under threshold.CPU current usage is: $cpuuse%"

Schedule it in crontab as per need

In the below example, I have scheduled it to run every 5 mins.

*/5 * * * * /bin/bash /root/scripts/cpu_load_checking.sh > /tmp/cpu_check_cron.log 2>&1

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Script to Monitor CPU usage on Linux Server