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179 lines
8.8 KiB
Markdown
179 lines
8.8 KiB
Markdown
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Linux Shell Script To Monitor CPU Utilization And Send Email)
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[#]: via: (https://www.2daygeek.com/linux-shell-script-to-monitor-cpu-utilization-usage-and-send-email/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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Linux Shell Script To Monitor CPU Utilization And Send Email
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======
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There are many opensource monitoring tools are available to monitor Linux systems performance.
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It will send an email alert when the system reaches the given threshold limit.
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It monitors everything such as CPU utilization, Memory utilization, swap utilization, disk space utilization and much more.
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If you only have few systems and want to monitor them then writing a small shell script can achieve this.
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In this tutorial we have added two shell script to monitor CPU utilization on Linux system.
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When the system reaches the given threshold then it will trigger a mail to corresponding email id.
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### Method-1 : Linux Shell Script To Monitor CPU Utilization And Send an Email
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If you want to only get CPU utilization percentage through mail when the system reaches the given threshold, use the following script.
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This is very simple and straightforward and one line script.
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It will trigger an email when your system reaches `80%` CPU utilization.
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```
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*/5 * * * * /usr/bin/cat /proc/loadavg | awk '{print $1}' | awk '{ if($1 > 80) printf("Current CPU Utilization is: %.2f%\n"), $0;}' | mail -s "High CPU Alert" [email protected]
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```
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**Note:** You need to change the email id instead of ours. Also, you can change the CPU utilization threshold value as per your requirement.
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**Output:** You will be getting an email alert similar to below.
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```
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Current CPU Utilization is: 80.40%
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```
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We had added many useful shell scripts in the past. If you want to check those, navigate to the below link.
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* **[How to automate day to day activities using shell scripts?][1]**
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### Method-2 : Linux Shell Script To Monitor CPU Utilization And Send an Email
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If you want to get more information about the CPU utilization in the mail alert.
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Then use the following script, which includes top CPU utilization process details based on the top Command and ps Command.
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This will inconstantly gives you an idea what is going on your system.
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It will trigger an email when your system reaches `80%` CPU utilization.
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**Note:** You need to change the email id instead of ours. Also, you can change the CPU utilization threshold value as per your requirement.
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```
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# vi /opt/scripts/cpu-alert.sh
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#!/bin/bash
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cpuuse=$(cat /proc/loadavg | awk '{print $1}')
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if [ "$cpuuse" > 80 ]; then
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SUBJECT="ATTENTION: CPU Load Is High on $(hostname) at $(date)"
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MESSAGE="/tmp/Mail.out"
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TO="[email protected]"
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echo "CPU Current Usage is: $cpuuse%" >> $MESSAGE
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echo "" >> $MESSAGE
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echo "+------------------------------------------------------------------+" >> $MESSAGE
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echo "Top CPU Process Using top command" >> $MESSAGE
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echo "+------------------------------------------------------------------+" >> $MESSAGE
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echo "$(top -bn1 | head -20)" >> $MESSAGE
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echo "" >> $MESSAGE
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echo "+------------------------------------------------------------------+" >> $MESSAGE
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echo "Top CPU Process Using ps command" >> $MESSAGE
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echo "+------------------------------------------------------------------+" >> $MESSAGE
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echo "$(ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10)" >> $MESSAGE
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mail -s "$SUBJECT" "$TO" < $MESSAGE
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rm /tmp/Mail.out
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fi
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```
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Finally add a **[cronjob][2]** to automate this. It will run every 5 minutes.
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```
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# crontab -e
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*/10 * * * * /bin/bash /opt/scripts/cpu-alert.sh
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```
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**Note:** You will be getting an email alert 5 mins later since the script has scheduled to run every 5 minutes (But it's not exactly 5 mins and it depends the timing).
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Say for example. If your system reaches the limit at 8.25 then you will get an email alert in another 5 mins. Hope it's clear now.
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**Output:** You will be getting an email alert similar to below.
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```
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CPU Current Usage is: 80.51%
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+------------------------------------------------------------------+
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Top CPU Process Using top command
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+------------------------------------------------------------------+
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top - 13:23:01 up 1:43, 1 user, load average: 2.58, 2.58, 1.51
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Tasks: 306 total, 3 running, 303 sleeping, 0 stopped, 0 zombie
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%Cpu0 : 6.2 us, 6.2 sy, 0.0 ni, 87.5 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu1 : 18.8 us, 0.0 sy, 0.0 ni, 81.2 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu2 : 50.0 us, 37.5 sy, 0.0 ni, 12.5 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu3 : 5.9 us, 5.9 sy, 0.0 ni, 88.2 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu4 : 0.0 us, 5.9 sy, 0.0 ni, 94.1 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu5 : 29.4 us, 23.5 sy, 0.0 ni, 47.1 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu6 : 0.0 us, 5.9 sy, 0.0 ni, 94.1 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu7 : 5.9 us, 0.0 sy, 0.0 ni, 94.1 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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KiB Mem : 16248588 total, 223436 free, 5816924 used, 10208228 buff/cache
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KiB Swap: 17873388 total, 17871340 free, 2048 used. 7440884 avail Mem
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PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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8867 daygeek 20 2743884 440420 360952 R 100.0 2.7 1:07.25 /usr/lib/virtualbox/VirtualBoxVM --comment CentOS7 --startvm 002f47b8-2af2-48f5-be1d-67b67e03514c --no-startvm-errormsgbox
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9119 daygeek 20 36136 784 R 46.7 0.0 0:00.07 /usr/bin/CROND -n
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1057 daygeek 20 889808 487692 461692 S 13.3 3.0 4:21.12 /usr/lib/Xorg vt2 -displayfd 3 -auth /run/user/1000/gdm/Xauthority -nolisten tcp -background none -noreset -keeptty -verbose 3
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3098 daygeek 20 1929012 351412 120532 S 13.3 2.2 16:42.51 /usr/lib/firefox/firefox -contentproc -childID 6 -isForBrowser -prefsLen 9236 -prefMapSize 184485 -parentBuildID 20190521202118 -greomni /us+
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1 root 20 188820 10144 7708 S 6.7 0.1 0:06.92 /sbin/init
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818 gdm 20 199836 25120 15876 S 6.7 0.2 0:01.85 /usr/lib/Xorg vt1 -displayfd 3 -auth /run/user/120/gdm/Xauthority -nolisten tcp -background none -noreset -keeptty -verbose 3
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1170 daygeek 9 -11 2676516 16516 12520 S 6.7 0.1 1:28.30 /usr/bin/pulseaudio --daemonize=no
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8271 root 20 I 6.7 0:00.21 [kworker/u16:4-i915]
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9117 daygeek 20 13528 4036 3144 R 6.7 0.0 0:00.01 top -bn1
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+------------------------------------------------------------------+
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Top CPU Process Using ps command
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+------------------------------------------------------------------+
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%CPU PID USER COMMAND
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8.8 8522 daygeek /usr/lib/virtualbox/VirtualBox
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86.2 8867 daygeek /usr/lib/virtualbox/VirtualBoxVM --comment CentOS7 --startvm 002f47b8-2af2-48f5-be1d-67b67e03514c --no-startvm-errormsgbox
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76.1 8921 daygeek /usr/lib/virtualbox/VirtualBoxVM --comment Ubuntu-18.04 --startvm e8c32dbb-8b01-41b0-977a-bf28b9db1117 --no-startvm-errormsgbox
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5.5 8080 daygeek /usr/bin/nautilus --gapplication-service
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4.7 4575 daygeek /usr/lib/firefox/firefox -contentproc -childID 12 -isForBrowser -prefsLen 9375 -prefMapSize 184485 -parentBuildID 20190521202118 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 1525 true tab
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4.4 3511 daygeek /usr/lib/firefox/firefox -contentproc -childID 8 -isForBrowser -prefsLen 9308 -prefMapSize 184485 -parentBuildID 20190521202118 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 1525 true tab
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4.4 3190 daygeek /usr/lib/firefox/firefox -contentproc -childID 7 -isForBrowser -prefsLen 9237 -prefMapSize 184485 -parentBuildID 20190521202118 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 1525 true tab
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4.4 1612 daygeek /usr/lib/firefox/firefox -contentproc -childID 1 -isForBrowser -prefsLen 1 -prefMapSize 184485 -parentBuildID 20190521202118 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 1525 true tab
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4.2 3565 daygeek /usr/bin/../lib/notepadqq/notepadqq-bin
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/linux-shell-script-to-monitor-cpu-utilization-usage-and-send-email/
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作者：[Magesh Maruthamuthu][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: https://www.2daygeek.com/category/shell-script/
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[2]: https://www.2daygeek.com/crontab-cronjob-to-schedule-jobs-in-linux/
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