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Merge pull request #14250 from lujun9972/add-MjAxOTA2MjEgQmFzaCBTY3JpcHQgdG8gTW9uaXRvciBNZW1vcnkgVXNhZ2Ugb24gTGludXgubWQK
选题: 20190621 Bash Script to Monitor Memory Usage on Linux
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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: (Bash Script to Monitor Memory Usage on Linux)
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[#]: via: (https://www.2daygeek.com/linux-bash-script-to-monitor-memory-utilization-usage-and-send-email/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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Bash Script to Monitor Memory Usage on Linux
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======
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There are many open source monitoring tools are currently available in market to monitor Linux systems performance.
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It will send an email alert when the system reaches the specified 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 make your task very easy.
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In this tutorial we have added two shell script to monitor Memory utilization on Linux system.
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When the system reaches the given threshold then it will trigger a mail to given email id.
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### Method-1 : Linux Bash Script To Monitor Memory Utilization And Send an Email
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If you want to only get current Memory utilization percentage through mail when the system reaches the given threshold, use the following script.
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This is very simple, straightforward and one line script. I preferred to go with this method in most of the time.
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It will trigger an email when your system reaches `80%` of Memory utilization.
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```
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*/5 * * * * /usr/bin/free | awk '/Mem/{printf("RAM Usage: %.2f%\n"), $3/$2*100}' | awk '{print $3}' | awk '{ if($1 > 80) print $0;}' | mail -s "High Memory 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 Memory 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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High Memory Alert: 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 Bash Script To Monitor Memory Utilization And Send an Email
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If you want to get more information about the Memory utilization in the mail alert.
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Then use the following script, which includes top Memory utilization process details based on the top Command and ps Command.
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This will instantly gives you an idea what is going on your system.
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It will trigger an email when your system reaches `80%` of Memory utilization.
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**Note:** You need to change the email id instead of ours. Also, you can change the Memory utilization threshold value as per your requirement.
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```
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# vi /opt/scripts/memory-alert.sh
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#!/bin/sh
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ramusage=$(free | awk '/Mem/{printf("RAM Usage: %.2f\n"), $3/$2*100}'| awk '{print $3}')
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if [ "$ramusage" > 20 ]; then
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SUBJECT="ATTENTION: Memory Utilization 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 "Memory Current Usage is: $ramusage%" >> $MESSAGE
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echo "" >> $MESSAGE
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echo "------------------------------------------------------------------" >> $MESSAGE
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echo "Top Memory Consuming Process Using top command" >> $MESSAGE
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echo "------------------------------------------------------------------" >> $MESSAGE
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echo "$(top -b -o +%MEM | head -n 20)" >> $MESSAGE
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echo "" >> $MESSAGE
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echo "------------------------------------------------------------------" >> $MESSAGE
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echo "Top Memory Consuming Process Using ps command" >> $MESSAGE
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echo "------------------------------------------------------------------" >> $MESSAGE
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echo "$(ps -eo pid,ppid,%mem,%Memory,cmd --sort=-%mem | head)" >> $MESSAGE
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mail -s "$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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*/5 * * * * /bin/bash /opt/scripts/memory-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 given limit at 8.25 then you will be getting 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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Memory Current Usage is: 80.71%
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+------------------------------------------------------------------+
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Top Memory Consuming Process Using top command
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+------------------------------------------------------------------+
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top - 12:00:58 up 5 days, 9:03, 1 user, load average: 1.82, 2.60, 2.83
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Tasks: 314 total, 1 running, 313 sleeping, 0 stopped, 0 zombie
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%Cpu0 : 8.3 us, 12.5 sy, 0.0 ni, 75.0 id, 0.0 wa, 0.0 hi, 4.2 si, 0.0 st
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%Cpu1 : 13.6 us, 4.5 sy, 0.0 ni, 81.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu2 : 21.7 us, 21.7 sy, 0.0 ni, 56.5 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu3 : 13.6 us, 9.1 sy, 0.0 ni, 77.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu4 : 17.4 us, 8.7 sy, 0.0 ni, 73.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu5 : 20.8 us, 4.2 sy, 0.0 ni, 70.8 id, 0.0 wa, 0.0 hi, 4.2 si, 0.0 st
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%Cpu6 : 9.1 us, 0.0 sy, 0.0 ni, 90.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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%Cpu7 : 17.4 us, 4.3 sy, 0.0 ni, 78.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
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KiB Mem : 16248588 total, 5015964 free, 6453404 used, 4779220 buff/cache
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KiB Swap: 17873388 total, 16928620 free, 944768 used. 6423008 avail Mem
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PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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17163 daygeek 20 2033204 487736 282888 S 10.0 3.0 8:26.07 /usr/lib/firefox/firefox -contentproc -childID 15 -isForBrowser -prefsLen 9408 -prefMapSize 184979 -parentBuildID 20190521202118 -greomni /u+
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1121 daygeek 20 4191388 419180 100552 S 5.0 2.6 126:02.84 /usr/bin/gnome-shell
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1902 daygeek 20 1701644 327216 82536 S 20.0 2.0 153:27.92 /opt/google/chrome/chrome
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2969 daygeek 20 1051116 324656 92388 S 15.0 2.0 149:38.09 /opt/google/chrome/chrome --type=renderer --field-trial-handle=10346122902703263820,11905758137655502112,131072 --service-pipe-token=1339861+
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1068 daygeek 20 1104856 309552 278072 S 5.0 1.9 143:47.42 /usr/lib/Xorg vt2 -displayfd 3 -auth /run/user/1000/gdm/Xauthority -nolisten tcp -background none -noreset -keeptty -verbose 3
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27246 daygeek 20 907344 265600 108276 S 30.0 1.6 10:42.80 /opt/google/chrome/chrome --type=renderer --field-trial-handle=10346122902703263820,11905758137655502112,131072 --service-pipe-token=8587368+
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+------------------------------------------------------------------+
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Top Memory Consuming Process Using ps command
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+------------------------------------------------------------------+
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PID PPID %MEM %CPU CMD
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8223 1 6.4 6.8 /usr/lib/firefox/firefox --new-window
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13948 1121 6.3 1.2 /usr/bin/../lib/notepadqq/notepadqq-bin
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8671 8223 4.4 7.5 /usr/lib/firefox/firefox -contentproc -childID 5 -isForBrowser -prefsLen 6999 -prefMapSize 184979 -parentBuildID 20190521202118 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 8223 true tab
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17163 8223 3.0 0.6 /usr/lib/firefox/firefox -contentproc -childID 15 -isForBrowser -prefsLen 9408 -prefMapSize 184979 -parentBuildID 20190521202118 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 8223 true tab
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1121 1078 2.5 1.6 /usr/bin/gnome-shell
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17937 8223 2.5 0.8 /usr/lib/firefox/firefox -contentproc -childID 16 -isForBrowser -prefsLen 9410 -prefMapSize 184979 -parentBuildID 20190521202118 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 8223 true tab
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8499 8223 2.2 0.6 /usr/lib/firefox/firefox -contentproc -childID 4 -isForBrowser -prefsLen 6635 -prefMapSize 184979 -parentBuildID 20190521202118 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 8223 true tab
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8306 8223 2.2 0.8 /usr/lib/firefox/firefox -contentproc -childID 1 -isForBrowser -prefsLen 1 -prefMapSize 184979 -parentBuildID 20190521202118 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 8223 true tab
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9198 8223 2.1 0.6 /usr/lib/firefox/firefox -contentproc -childID 7 -isForBrowser -prefsLen 8604 -prefMapSize 184979 -parentBuildID 20190521202118 -greomni /usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/browser 8223 true tab
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/linux-bash-script-to-monitor-memory-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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