Hello Folks,
I have created the script which use to send email notification when server memory breach the threshold limits. Script works fine, but the issue is sometimes i am receiving mail alerts for lower threshold memory also.
Please let me know why and any updates required in script?
Code:
#!/bin/bash
# Shell script to monitor or watch the high Mem-load
# It will send an email to $ADMIN, if the (memroy load is in %) percentage
# of Mem-load is >= 80%
HOSTNAME=`hostname`
LOAD=80.00
CAT=/bin/cat
MAILFILE=/tmp/mailviews
MAILER=/bin/mail
mailto="skrishna1@xxx.com"
MEM_LOAD=`free -t | awk 'FNR == 2 {printf("Current Memory Utilization is : %.2f%"), $3/$2*100}'`
if [[ $MEM_LOAD > $LOAD ]];
then
PROC=`ps -eo pcpu,pid -o comm= | sort -k1 -n -r | head -1`
echo "Please check your processess on ${HOSTNAME} the value of cpu load is $CPU_LOAD % & $PROC" > $MAILFILE
echo "$(ps axo %mem,pid,euser,cmd | sort -nr | head -n 10)" > $MAILFILE
$CAT $MAILFILE | $MAILER -s "Memory Utilization is High > 80%, $MEM_LOAD % on ${HOSTNAME}" $mailto
fi
Last edited by Scrutinizer; 12-27-2019 at 06:53 AM..
Reason: Please use code tags!!
What Linux version are you using?
Check the difference between free memory and available memory.
With older Linux versions check the -/+ buffers/cache: line.
The buffers/cache/slab memory is memory that is used to speed up things, but that is available when an application needs it.
So consider leaving that out when reporting memory usage..
--
When used with [[ .. ]] , the < and > operators sort lexicographically using the current locale. So it is a string comparison which may lead to surprising results.
For numerical comparison use either the test utility :
Code:
if [ $MEM_LOAD -gt $LOAD ]
like Neo suggested,
or use bash' s arithmetic comparison
Code:
if (( MEM_LOAD > LOAD ))
Note: like the test utility, arithmetic comparison in bash cannot handle floating point. So you need to round down / truncate the numbers used in the comparison. So for example use LOAD=80 rather than LOAD=80.00. If you need floating point you need to use an external utility like bc.
Last edited by Scrutinizer; 12-27-2019 at 09:48 AM..
Then you can disregard the stuff about older Linux versions, so check the difference between "free memory" and "available memory", plus the remarks by Neo and I about numerical comparisons..
There are several further mistakes in your script:
Text message in MEM_LOAD (that you cannot compare with a numeric value),
two useless code lines about PROC and CPU_LOAD,
useless use of echo,
useless use of cat,
unnecessary and unsafe use of a /tmp/ file.
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12-27-2019
