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?
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 :
like Neo suggested,
or use bash' s arithmetic comparison
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.
These 2 Users Gave Thanks to MadeInGermany For This Post:
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